This page has only limited features, please log in for full access.

Unclaimed
José J. Martínez
Universidad Pedagógica y Tecnológica de Colombia, Colombia

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Communication
Published: 25 May 2021 in Molbank
Reads 0
Downloads 0

The novel N-(3,5-bis(trifluoromethyl)benzyl)stearamide 3 was prepared in moderate yield by a solventless direct amidation reaction of stearic acid 1 with 3,5-bis(trifluoromethyl)benzylamine 2 at 140 °C for 24 h under metal- and catalyst-free conditions. This practical method was conducted in air without any special treatment or activation. The fatty acid amide 3 was fully characterized by IR, UV–Vis, 1D and 2D NMR spectroscopy, mass spectrometry, and elemental analysis. Moreover, molecular electrostatic potential studies, determination of quantum descriptors, fundamental vibrational frequencies, and intensity of vibrational bands were computed by density functional theory (DFT) using the B3LYP method with 6-311+G(d,p) basis set in gas phase. Simulation of the infrared spectrum using the results of these calculations led to good agreement with the observed spectral patterns.

ACS Style

Angélica Salinas-Torres; Hugo Rojas; José Martínez; Diana Becerra; Juan-Carlos Castillo. Synthesis, Characterization, and DFT Studies of N-(3,5-Bis(trifluoromethyl)benzyl)stearamide. Molbank 2021, 2021, M1215 .

AMA Style

Angélica Salinas-Torres, Hugo Rojas, José Martínez, Diana Becerra, Juan-Carlos Castillo. Synthesis, Characterization, and DFT Studies of N-(3,5-Bis(trifluoromethyl)benzyl)stearamide. Molbank. 2021; 2021 (2):M1215.

Chicago/Turabian Style

Angélica Salinas-Torres; Hugo Rojas; José Martínez; Diana Becerra; Juan-Carlos Castillo. 2021. "Synthesis, Characterization, and DFT Studies of N-(3,5-Bis(trifluoromethyl)benzyl)stearamide." Molbank 2021, no. 2: M1215.

Journal article
Published: 24 May 2021 in Revista Facultad de Ingeniería Universidad de Antioquia
Reads 0
Downloads 0

This study evaluated the synthesis, characterization, and activity of fluorinated titanium dioxide materials (TiO2-F 1% and TiO2-F 5%) in-situ modified by the sol-gel method in the esterification reaction of levulinic acid conducted by catalytic and photocatalytic processes. The physicochemical properties of the materials were determined by X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, thermal analysis, and pyridine adsorption. It was found that the inclusion of fluoride anion causes a decrease in the levulinic acid conversion by photocatalytic reaction; however, in the catalytic activation, a slight increase in the conversion using the fluoride materials was observed. Finally, the reaction in the presence of halogenated solvents (CCl4) by photolysis reaction favors a conversion of 100% in 1h.

ACS Style

Claudia Patricia Castañeda Martínez; José Jobanny Martínez Zambrano; Andrés Camilo Mesa. Esterification of levulinic acid via catalytic and photocatalytic processes using fluorinated titanium dioxide materials. Revista Facultad de Ingeniería Universidad de Antioquia 2021, 1 .

AMA Style

Claudia Patricia Castañeda Martínez, José Jobanny Martínez Zambrano, Andrés Camilo Mesa. Esterification of levulinic acid via catalytic and photocatalytic processes using fluorinated titanium dioxide materials. Revista Facultad de Ingeniería Universidad de Antioquia. 2021; ():1.

Chicago/Turabian Style

Claudia Patricia Castañeda Martínez; José Jobanny Martínez Zambrano; Andrés Camilo Mesa. 2021. "Esterification of levulinic acid via catalytic and photocatalytic processes using fluorinated titanium dioxide materials." Revista Facultad de Ingeniería Universidad de Antioquia , no. : 1.

Journal article
Published: 11 May 2021 in Materials
Reads 0
Downloads 0

Whey in large quantities can cause environmental problems when discarded, because it reduces dissolved oxygen and aquatic life. Nonetheless, it could be used as an easily available and economical alternative to reduce culture medium costs in microbially induced calcium carbonate precipitation (MICP). In this work, a native Sporosarcina pasteurii was isolated and then cultured by using different proportions of whey (W) in nutrient broth (NB). The solids were characterized by XRD, FT-IR, TGA, and SEM. The potential applications in bioconsolidation were also studied. Whey concentration was directly related to CaCO3 production. Higher whey concentrations reduced calcium carbonate purity to nearly 80%. All experiments showed calcite and vaterite fractions, where a whey increment in the media increased calcite content and decreased vaterite content, causing a decrease in crystal size. MICP improved compressive strength (CS) in sand and fly ash. The best CS results were obtained by fly ash treated with 25 W-75 NB (37.2 kPa) and sand with 75 W-25 NB (32.1 kPa). Whey changed crystal polymorphism in biogenic CaCO3 production. Material bioconsolidation depends on the CaCO3 polymorph, thus fly ash was effectively bioconsolidated by crystallization of vaterite and sand by crystallization of calcite.

ACS Style

Sandra Chaparro; Hugo Rojas; Gerardo Caicedo; Gustavo Romanelli; Antonio Pineda; Rafael Luque; José Martínez. Whey as an Alternative Nutrient Medium for Growth of Sporosarcina pasteurii and Its Effect on CaCO3 Polymorphism and Fly Ash Bioconsolidation. Materials 2021, 14, 2470 .

AMA Style

Sandra Chaparro, Hugo Rojas, Gerardo Caicedo, Gustavo Romanelli, Antonio Pineda, Rafael Luque, José Martínez. Whey as an Alternative Nutrient Medium for Growth of Sporosarcina pasteurii and Its Effect on CaCO3 Polymorphism and Fly Ash Bioconsolidation. Materials. 2021; 14 (10):2470.

Chicago/Turabian Style

Sandra Chaparro; Hugo Rojas; Gerardo Caicedo; Gustavo Romanelli; Antonio Pineda; Rafael Luque; José Martínez. 2021. "Whey as an Alternative Nutrient Medium for Growth of Sporosarcina pasteurii and Its Effect on CaCO3 Polymorphism and Fly Ash Bioconsolidation." Materials 14, no. 10: 2470.

Journal article
Published: 03 February 2021 in Catalysis Today
Reads 0
Downloads 0

The bioconversion of furfural to furfuryl alcohol is an attractive route in biomass valorization that could replace traditional contaminant methods. The use of whole cells has been explored for this purpose. Bacillus cereus without previous treatment with furanic compounds was used to selectively obtain furfuryl alcohol. Growing and resting cells were employed. Using growing cells of B. cereus, lower yields to alcohol were obtained because of furfural toxicity. However, employing resting cells it was possible to reach higher yields to furfuryl alcohol. Optimal operative conditions were studied: different concentrations of furfural, glucose and molybdenum, pH, and temperature. Thus, glucose (100 mM) and molybdenum (0.1 mM) were added to maintain cell biomass obtaining a yield to furfuryl alcohol close to 80% at 30 °C, pH 7.2 from 30 mM of furfural.

ACS Style

Alejandra Rodríguez M; Leidy Y. Rache; María H. Brijaldo; Gustavo P. Romanelli; Rafael Luque; José J. Martinez. Biocatalytic transformation of furfural into furfuryl alcohol using resting cells of Bacillus cereus. Catalysis Today 2021, 1 .

AMA Style

Alejandra Rodríguez M, Leidy Y. Rache, María H. Brijaldo, Gustavo P. Romanelli, Rafael Luque, José J. Martinez. Biocatalytic transformation of furfural into furfuryl alcohol using resting cells of Bacillus cereus. Catalysis Today. 2021; ():1.

Chicago/Turabian Style

Alejandra Rodríguez M; Leidy Y. Rache; María H. Brijaldo; Gustavo P. Romanelli; Rafael Luque; José J. Martinez. 2021. "Biocatalytic transformation of furfural into furfuryl alcohol using resting cells of Bacillus cereus." Catalysis Today , no. : 1.

Journal article
Published: 08 January 2021 in Ciencia en Desarrollo
Reads 0
Downloads 0

Se han desarrollado procedimientos de inmovilización con invertasa utilizando diferentes soportes. Sin embargo, las desventajas como el uso de partículas pequeñas para inmovilizaciones de invertasa en reactores de lecho compacto se están resolviendo utilizando partículas magnéticas. En este estudio, los compuestos que contienen Fe3O4 se prepararon mediante la incorporación de una capa de polisiloxano necesaria para la adsorción física de la invertasa. Además, la magnetita funcionalizada se activó con glutaraldehído y polietilenimina (PEI) con el objetivo de realizar una inmovilización covalente. Se analizó el efecto de diferentes condiciones como la relación enzima: soporte, pH y temperatura en la conservación de la invertasa. Los resultados demostraron que la relación enzima: soporte óptima es mayor para la unión covalente que para la adsorción física. El pH ideal para la enzima inmovilizada es 5,0 y la actividad enzimática se mantiene hasta 70 ° C. Los valores de km son similares en ambos métodos de inmovilización. El análisis del efecto del pH y la termoestabilidad mostró que la actividad catalítica de la invertasa no se ve afectada en comparación con la enzima libre. La inmovilización covalente muestra una mayor eficacia en el proceso de inmovilización (Fε), menos inhibición y el doble de estabilidad. Las enzimas inmovilizadas por métodos físicos y covalentes se pueden reutilizar hasta por cuatro ciclos y se pueden eliminar del medio de reacción aplicando un campo magnético externo.

ACS Style

Annie Y. Vargas; Gustavo P. Romanelli; Jose J. Martinez. Nanopartículas magnéticas funcionalizadas y modificadas con entrecruzamiento para mejorar la inmovilización de la invertasa. Ciencia en Desarrollo 2021, 12, 69 -77.

AMA Style

Annie Y. Vargas, Gustavo P. Romanelli, Jose J. Martinez. Nanopartículas magnéticas funcionalizadas y modificadas con entrecruzamiento para mejorar la inmovilización de la invertasa. Ciencia en Desarrollo. 2021; 12 (1):69-77.

Chicago/Turabian Style

Annie Y. Vargas; Gustavo P. Romanelli; Jose J. Martinez. 2021. "Nanopartículas magnéticas funcionalizadas y modificadas con entrecruzamiento para mejorar la inmovilización de la invertasa." Ciencia en Desarrollo 12, no. 1: 69-77.

Full paper
Published: 13 September 2020 in Asian Journal of Organic Chemistry
Reads 0
Downloads 0

Although different ways of converting 5‐(hydroxymethyl)furfural (1) to various substrates with high value have been sought, few transformations have obtained building blocks that can be very useful in the area of fine chemistry. Herein, we report the synthesis of protoanemonin (5‐methylenefuran‐2(5H)‐one) from D‐fructose via compound (1), a versatile γ‐alkylidenebutenolide, using an efficient self‐catalysed process with formic acid, with high reaction performance and selectivity (up to 94% yield and 98% conversion from (1), while 28% yield from D‐fructose). This efficient and simple operational process involved a two‐phase aqueous‐organic system between chlorinated solvents (CHxCly) and hydrogen peroxide as the initial oxidizing agent. The reaction presents a key cleavage in the 5‐hydroxymethyl moiety of (1), due to the Baeyer‐Villiger oxidation (BVO) process that generates formic acid in situ. Ultimately, DFF and HMF were successfully obtained in 80% and 98% yield, respectively, starting from D‐fructose and using Preyssler heteropolyacids as Brønsted acid catalysts under an atmosphere of oxygen in the absence of hydrogen peroxide.

ACS Style

José J. Martínez; Luis A. Páez; Luisa F. Gutiérrez; Oscar H. Pardo Cuervo; Hugo A. Rojas; Gustavo P. Romanelli; Jaime Portilla; Juan‐Carlos Castillo; Diana Becerra. Obtaining Protoanemonin through Selective Oxidation of D‐Fructose and 5‐(Hydroxymethyl)furfural in a Self‐catalysed Reaction. Asian Journal of Organic Chemistry 2020, 9, 2184 -2190.

AMA Style

José J. Martínez, Luis A. Páez, Luisa F. Gutiérrez, Oscar H. Pardo Cuervo, Hugo A. Rojas, Gustavo P. Romanelli, Jaime Portilla, Juan‐Carlos Castillo, Diana Becerra. Obtaining Protoanemonin through Selective Oxidation of D‐Fructose and 5‐(Hydroxymethyl)furfural in a Self‐catalysed Reaction. Asian Journal of Organic Chemistry. 2020; 9 (12):2184-2190.

Chicago/Turabian Style

José J. Martínez; Luis A. Páez; Luisa F. Gutiérrez; Oscar H. Pardo Cuervo; Hugo A. Rojas; Gustavo P. Romanelli; Jaime Portilla; Juan‐Carlos Castillo; Diana Becerra. 2020. "Obtaining Protoanemonin through Selective Oxidation of D‐Fructose and 5‐(Hydroxymethyl)furfural in a Self‐catalysed Reaction." Asian Journal of Organic Chemistry 9, no. 12: 2184-2190.

Research article
Published: 17 August 2020 in ACS Sustainable Chemistry & Engineering
Reads 0
Downloads 0

Biogenic carbonates were studied as catalysts in this work for the direct synthesis of amides under solvent-free conditions. Solids were synthesized by microbial co precipitation of CaCl2 and Ni, Cu and Fe salts. Materials were characterized by thermogravimetric analysis, nitrogen physisorption measurements, X-ray diffraction, and X-ray photoelectron spectroscopy. The polymorphism, hydrophilicity and textural properties depended on the metal type incorporated on CaCO3. Succinimide synthesis was employed as test reaction, obtaining remarkable conversion (46 and 28%) in the reaction between succinic acid and p-toluidine and aniline, respectively.

ACS Style

Sandra Chaparro; Hugo A Rojas; Juan Carlos Castillo; Jaime Portilla; Gustavo P Romanelli; Antonio Pineda; Asma Elsharif; Jose J Martínez; Rafael Luque. Solventless Amide Synthesis Catalyzed by Biogenic CaCO3 materials. ACS Sustainable Chemistry & Engineering 2020, 8, 1 .

AMA Style

Sandra Chaparro, Hugo A Rojas, Juan Carlos Castillo, Jaime Portilla, Gustavo P Romanelli, Antonio Pineda, Asma Elsharif, Jose J Martínez, Rafael Luque. Solventless Amide Synthesis Catalyzed by Biogenic CaCO3 materials. ACS Sustainable Chemistry & Engineering. 2020; 8 (35):1.

Chicago/Turabian Style

Sandra Chaparro; Hugo A Rojas; Juan Carlos Castillo; Jaime Portilla; Gustavo P Romanelli; Antonio Pineda; Asma Elsharif; Jose J Martínez; Rafael Luque. 2020. "Solventless Amide Synthesis Catalyzed by Biogenic CaCO3 materials." ACS Sustainable Chemistry & Engineering 8, no. 35: 1.

Journal article
Published: 15 August 2020 in International Journal of Hydrogen Energy
Reads 0
Downloads 0

Acetic acid decomposition to produce hydrogen was studied over Pd/Al2O3, Pt/Al2O3, Ni/Al2O3, and Co/Al2O3 catalysts. Pd/Al2O3 and Pt/Al2O3 systems exhibited high levels of conversion and hydrogen selectivity, with Pt/Al2O3 showing a hydrogen selectivity of 51.3% at 973 K. This behavior was influenced by the high dispersion and small particle size of Pt as well as the dissociative adsorption of acetic acid (acetate species) as exhibited by Pt/Al2O3 and Pd/Al2O3 systems. Additionally, Ni/Al2O3 and Co/Al2O3 were less active and presented low selectivity to hydrogen. These catalysts exhibited low dissociation of acetic acid on their surfaces, therefore hindering acetic acid transformation and hydrogen generation. However, when Ni/Al2O3 and Co/Al2O3 were reduced at 973 K, the conversion of acetic acid and hydrogen formation increased favorably. Co/Al2O3 showed less deactivation during time on stream. Deposited carbon on catalysts corresponded to the formation of carbon filaments for Pd/Al2O3 and Co/Al2O3 and of carbon nanotubes in the case of Ni/Al2O3.

ACS Style

Maria H. Brijaldo; Alexander E. Caytuero; José J. Martínez; Hugo Rojas; Fabio B. Passos. Hydrogen production from acetic acid decomposition as bio-oil model molecule over supported metal catalysts. International Journal of Hydrogen Energy 2020, 45, 28732 -28751.

AMA Style

Maria H. Brijaldo, Alexander E. Caytuero, José J. Martínez, Hugo Rojas, Fabio B. Passos. Hydrogen production from acetic acid decomposition as bio-oil model molecule over supported metal catalysts. International Journal of Hydrogen Energy. 2020; 45 (53):28732-28751.

Chicago/Turabian Style

Maria H. Brijaldo; Alexander E. Caytuero; José J. Martínez; Hugo Rojas; Fabio B. Passos. 2020. "Hydrogen production from acetic acid decomposition as bio-oil model molecule over supported metal catalysts." International Journal of Hydrogen Energy 45, no. 53: 28732-28751.

Journal article
Published: 16 April 2020 in Catalysis Today
Reads 0
Downloads 0

CaCO3 obtained from Sporosarcina pasteurii isolated from agricultural soils has been employed as catalytic support for Pd that was subsequently loaded on CaCO3 by wet impregnation with a metal loading of 0.5 wt.% using Palladium acetate as precursor. The materials were characterized via nitrogen physisorption measurements, X-ray diffraction, X-ray photoelectronic spectroscopy, TGA Analysis and TEM microscopy. Pd0.5/CaCO3 was able to successfully hydrogenate phenylacetylene into styrene and ethylbenzene as products. Thus, through the proper optimization of the reaction conditions (flow rate, temperature, pressure) it was possible lead the reaction towards the selective production of styrene, a monomer widely used in the polymer industry, from phenylacetylene as starting material in yields up to 65 %.

ACS Style

Sandra Chaparro; José J. Martinez; Hugo A. Rojas; Antonio Pineda; Rafael Luque. Selective continuous flow phenylacetylene hydrogenation over Pd-biogenic calcium carbonate. Catalysis Today 2020, 368, 181 -186.

AMA Style

Sandra Chaparro, José J. Martinez, Hugo A. Rojas, Antonio Pineda, Rafael Luque. Selective continuous flow phenylacetylene hydrogenation over Pd-biogenic calcium carbonate. Catalysis Today. 2020; 368 ():181-186.

Chicago/Turabian Style

Sandra Chaparro; José J. Martinez; Hugo A. Rojas; Antonio Pineda; Rafael Luque. 2020. "Selective continuous flow phenylacetylene hydrogenation over Pd-biogenic calcium carbonate." Catalysis Today 368, no. : 181-186.

Full paper
Published: 08 April 2020 in ChemistrySelect
Reads 0
Downloads 0

Catalytic dehydration of xylose to yield furfural was studied by testing different heteropolyacid‐type catalysts. Preyssler heteropolyacid (HPA‐Preyssler) (H14[NaP5W30O110]) was the most efficient. Under the optimal reaction conditions, xylose was dehydrated into furfural with 73% of yield and 95% of selectivity using DMSO as solvent at 140 °C for 4 h. The HPA‐Preyssler catalyst also exhibited good catalytic activity in the dehydration of fructose and glucose to yield 5‐hydroxymethylfurfural (HMF). Thus, from fructose a yield and selectivity to HMF of 97% and 98%, respectively, was obtained in just 10 min, while from glucose, 91% of conversion and 23% of yield were obtained after 9 h. An easy and efficient methodology for the recovery and reuse of HPA‐Preyssler in at least six reaction cycles without appreciable loss of its initial catalytic activity is reported.

ACS Style

Oscar H. Pardo Cuervo; Gustavo P. Romanelli; Jairo A. Cubillos; Hugo A. Rojas; Jose J Martínez. Selective Catalytic Dehydration of Xylose to Furfural and Fructose and Glucose to 5‐Hydroximethylfurfural (HMF) Using Preyssler Heteropolyacid. ChemistrySelect 2020, 5, 4186 -4193.

AMA Style

Oscar H. Pardo Cuervo, Gustavo P. Romanelli, Jairo A. Cubillos, Hugo A. Rojas, Jose J Martínez. Selective Catalytic Dehydration of Xylose to Furfural and Fructose and Glucose to 5‐Hydroximethylfurfural (HMF) Using Preyssler Heteropolyacid. ChemistrySelect. 2020; 5 (14):4186-4193.

Chicago/Turabian Style

Oscar H. Pardo Cuervo; Gustavo P. Romanelli; Jairo A. Cubillos; Hugo A. Rojas; Jose J Martínez. 2020. "Selective Catalytic Dehydration of Xylose to Furfural and Fructose and Glucose to 5‐Hydroximethylfurfural (HMF) Using Preyssler Heteropolyacid." ChemistrySelect 5, no. 14: 4186-4193.

Journal article
Published: 07 March 2020 in Fuel
Reads 0
Downloads 0

The production of 2,5-dimethylfuran (DMF) from 5-hydroxymethylfurfural (HMF) over different copper supported catalysts was investigated. An adequate metal dispersion and the nature of acid sites played a role in catalytic activity. Alumina containing catalysts showed the best performance in HMF hydrogenation and DMF production due to both higher acidity and copper particle size. Cu/Al2O3, Cu/Fe2O3-Al2O3, Cu/Nb2O5-Al2O3-623 and Cu/Nb2O5-Al2O3-773 showed a complete HMF conversion at 1 h of reaction and a DMF yield higher than 85% with a negligible quantity of ring-hydrogenation products (<1%). Except for Cu/Nb2O5, DMF production occurs via 2,5-bis (hydroxymethyl) furan (BHMF) as the key intermediate.

ACS Style

Laura M. Esteves; Maria H. Brijaldo; Elias G. Oliveira; Jose J Martínez; Hugo Rojas; Alexander Caytuero; Fabio B. Passos. Effect of support on selective 5-hydroxymethylfurfural hydrogenation towards 2,5-dimethylfuran over copper catalysts. Fuel 2020, 270, 117524 .

AMA Style

Laura M. Esteves, Maria H. Brijaldo, Elias G. Oliveira, Jose J Martínez, Hugo Rojas, Alexander Caytuero, Fabio B. Passos. Effect of support on selective 5-hydroxymethylfurfural hydrogenation towards 2,5-dimethylfuran over copper catalysts. Fuel. 2020; 270 ():117524.

Chicago/Turabian Style

Laura M. Esteves; Maria H. Brijaldo; Elias G. Oliveira; Jose J Martínez; Hugo Rojas; Alexander Caytuero; Fabio B. Passos. 2020. "Effect of support on selective 5-hydroxymethylfurfural hydrogenation towards 2,5-dimethylfuran over copper catalysts." Fuel 270, no. : 117524.

Journal article
Published: 07 February 2020 in Materials
Reads 0
Downloads 0

The search for catalysts with features that can improve coke resistance and decrease byproduct formation is a current goal in H2 production from renewable sources. In this work, the effect of the presence of Ni nanoparticles over Co/La-Ce oxides on the ethanol decomposition reaction was studied. Catalysts were synthetized using as precursor a La0.8Ce0.2NixCo1-xO3 perovskite-type material to ensure a low segregation of phases and a high dispersion of metals. After reduction at 873 K, the perovskite structure was destroyed, and metal Co-Ni particles were supported over a lanthanum-cerium oxide. The materials were characterized by different techniques before and after reaction. Solids exhibited metal particle sizes between 5 and 15 nm demonstrating the advantages of the preparation method to obtain Ni-Co alloys. Although the results of adsorption of ethanol followed by diffuse reflectance infrared fourier transformed spectroscopy (DRIFTS) showed acetate species strongly adsorbed on the catalyst’s surface, the material (Ni0.7Co0.3/La0.8Ce0.2) with the lowest particle size was the most stable system leading to the lowest amount of carbon deposits during ethanol decomposition. This catalyst showed the better performance, with a higher ethanol conversion (98.4%) and hydrogen selectivity (75%). All catalysts exhibited carbonaceous deposits, which were an ordered and disordered carbon phase mixture.

ACS Style

Harold R. Vergara; Maria H. Brijaldo; José J. Martinez; Hugo A. Rojas; José Pedraza; Fabio B. Passos; Luiz Pereira Da Costa; Daniela Gonzalez-Vera; Paula Osorio-Vargas. Effect of Metal Content on Ethanol Decomposition over Ni-Co Catalysts Supported on La-Ce Oxides. Materials 2020, 13, 759 .

AMA Style

Harold R. Vergara, Maria H. Brijaldo, José J. Martinez, Hugo A. Rojas, José Pedraza, Fabio B. Passos, Luiz Pereira Da Costa, Daniela Gonzalez-Vera, Paula Osorio-Vargas. Effect of Metal Content on Ethanol Decomposition over Ni-Co Catalysts Supported on La-Ce Oxides. Materials. 2020; 13 (3):759.

Chicago/Turabian Style

Harold R. Vergara; Maria H. Brijaldo; José J. Martinez; Hugo A. Rojas; José Pedraza; Fabio B. Passos; Luiz Pereira Da Costa; Daniela Gonzalez-Vera; Paula Osorio-Vargas. 2020. "Effect of Metal Content on Ethanol Decomposition over Ni-Co Catalysts Supported on La-Ce Oxides." Materials 13, no. 3: 759.

Journal article
Published: 03 January 2020 in Catalysts
Reads 0
Downloads 0

Lamellar double hydroxides (LDH) with double divalent cations were synthesized by the co-precipitation method and studied in the multicomponent synthesis of 4H-pyrans. The solids obtained were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), N2 adsorption isotherms, and thermogravimetric analysis (TGA). The XRD patterns confirmed the formation of LDHs in which the incorporation of Ni2+ or Co2+ improves their crystalline and textural properties. The results of catalytic activity showed that the synthesis of 4H-pyrans is favored in solvent-free conditions with the LDH–Ni catalyst, avoiding calcination processes. In addition, it was found that hydrotalcite with double divalent cations can conduct this reaction through multicomponent synthesis or by the Michael addition reaction, which can be performed by different types of basicity that depend on the composition of another divalent cation in the brucite layer or a calcination process.

ACS Style

Eliana Nope; Ángel G. Sathicq; José J. Martínez; Hugo A. Rojas; Rafael Luque; Gustavo P. Romanelli. Ternary Hydrotalcites in the Multicomponent Synthesis of 4H-Pyrans. Catalysts 2020, 10, 70 .

AMA Style

Eliana Nope, Ángel G. Sathicq, José J. Martínez, Hugo A. Rojas, Rafael Luque, Gustavo P. Romanelli. Ternary Hydrotalcites in the Multicomponent Synthesis of 4H-Pyrans. Catalysts. 2020; 10 (1):70.

Chicago/Turabian Style

Eliana Nope; Ángel G. Sathicq; José J. Martínez; Hugo A. Rojas; Rafael Luque; Gustavo P. Romanelli. 2020. "Ternary Hydrotalcites in the Multicomponent Synthesis of 4H-Pyrans." Catalysts 10, no. 1: 70.

Journal article
Published: 04 November 2019 in Biochemical Engineering Journal
Reads 0
Downloads 0

A valuable monomer in the synthesis of various polyesters is 5-hydroxymethyl-2-furan carboxylic acid (HMFCA). In this work, the synthesis of HMFCA using crude HMF obtained from fructose is described. To obtain crude HMF, fructose dehydration was performed by thermal treatment with Nb2O5, obtaining a yield of 76%. Then, the crude HMF was evaluated in the production of HMFCA using Serratia marcescens at different conditions such as initial optical density (OD), pH, temperature, and substrate concentration. Once the conditions were optimized, the HMFCA concentration of 790.2 mg/L was obtained using the fed-batch strategy.

ACS Style

Tatiana Muñoz; Leidy Y. Rache; Hugo A. Rojas; Gustavo P. Romanelli; José J. Martinez; Rafael Luque. Production of 5-hydroxymethyl-2-furan carboxylic acid by Serratia marcescens from crude 5-hydroxymethylfurfural. Biochemical Engineering Journal 2019, 154, 107421 .

AMA Style

Tatiana Muñoz, Leidy Y. Rache, Hugo A. Rojas, Gustavo P. Romanelli, José J. Martinez, Rafael Luque. Production of 5-hydroxymethyl-2-furan carboxylic acid by Serratia marcescens from crude 5-hydroxymethylfurfural. Biochemical Engineering Journal. 2019; 154 ():107421.

Chicago/Turabian Style

Tatiana Muñoz; Leidy Y. Rache; Hugo A. Rojas; Gustavo P. Romanelli; José J. Martinez; Rafael Luque. 2019. "Production of 5-hydroxymethyl-2-furan carboxylic acid by Serratia marcescens from crude 5-hydroxymethylfurfural." Biochemical Engineering Journal 154, no. : 107421.

Communication
Published: 28 August 2019 in Energy Technology
Reads 0
Downloads 0

The catalytic etherification of 5‐hydroxymethylfurfural (HMF) with t‐butanol to a biofuel additive 5‐(t‐butoxymethyl) furfural (t‐BMF) is studied by screening 27 heterogeneous protic and/or Lewis acids. Preyssler heteropolyacid H14[NaP5W30O110] and Montmorillonite‐based CLOI_CSP catalysts are identified as the most efficient ones, allowing the etherification to reach the t‐BMF/HMF equilibrium faster (≈1:1), thus promoting minimum side reactions. Further optimization of the batch experimental conditions, namely catalyst loading, temperature, HMF concentration, time, t‐BMF stability, and additives, allows the t‐BMF/HMF equilibrium to be reached in less than 3 h with outstanding selectivity >95%. Under optimized conditions, CLOI_CSP is reused for four cycles without significant loss of efficiency. In addition, it exhibits high efficiency under flow conditions, allowing continuous production of t‐BMF up to 0.7 g t‐BMF g−1 catalyst min−1 at high concentrations of HMF.

ACS Style

Oscar H. Pardo Cuervo; Svilen Simeonov; Andreia Peixoto; Margarita D. Popova; Hristina Lazarova; Gustavo P. Romanelli; Jose J Martínez; Cristina Freire; Carlos A. M. Afonso. Efficient Continuous Production of the Biofuel Additive 5‐( t‐ Butoxymethyl) Furfural from 5‐Hydroxymethylfurfural. Energy Technology 2019, 7, 1 .

AMA Style

Oscar H. Pardo Cuervo, Svilen Simeonov, Andreia Peixoto, Margarita D. Popova, Hristina Lazarova, Gustavo P. Romanelli, Jose J Martínez, Cristina Freire, Carlos A. M. Afonso. Efficient Continuous Production of the Biofuel Additive 5‐( t‐ Butoxymethyl) Furfural from 5‐Hydroxymethylfurfural. Energy Technology. 2019; 7 (11):1.

Chicago/Turabian Style

Oscar H. Pardo Cuervo; Svilen Simeonov; Andreia Peixoto; Margarita D. Popova; Hristina Lazarova; Gustavo P. Romanelli; Jose J Martínez; Cristina Freire; Carlos A. M. Afonso. 2019. "Efficient Continuous Production of the Biofuel Additive 5‐( t‐ Butoxymethyl) Furfural from 5‐Hydroxymethylfurfural." Energy Technology 7, no. 11: 1.

Research article
Published: 12 May 2019 in Journal of Nanomaterials
Reads 0
Downloads 0

Magnetic materials based on Keggin heteropolyacids immobilized on mesoporous silica-coated magnetite particles with a core-shell structure were synthesized. The activity of the catalyst was studied in the esterification reaction of levulinic acid with n-butanol, and its kinetics was studied by the systematic variation of several reaction parameters, such as stirring speed, catalyst loading, molar ratio of reactants, and temperature. It was also seen that the reaction was free from any external mass transfer as well as intraparticle diffusion limitations and was intrinsically kinetically controlled. A second-order kinetic equation was found to be consistent with the experimental data. Also, an experimental activation energy of 17 kcal/mol was found. A solvent-free condition for this reaction has also added the green chemistry perception to the reaction. In addition, the resulting catalyst can be used repeatedly without significant decrease in activity.

ACS Style

Angélica M. Escobar; Mirta N. Blanco; José J. Martínez; Jairo A. Cubillos; Gustavo P. Romanelli; Luis R. Pizzio. Biomass Derivative Valorization Using Nano Core-Shell Magnetic Materials Based on Keggin-Heteropolyacids: Levulinic Acid Esterification Kinetic Study with N-Butanol. Journal of Nanomaterials 2019, 2019, 1 -14.

AMA Style

Angélica M. Escobar, Mirta N. Blanco, José J. Martínez, Jairo A. Cubillos, Gustavo P. Romanelli, Luis R. Pizzio. Biomass Derivative Valorization Using Nano Core-Shell Magnetic Materials Based on Keggin-Heteropolyacids: Levulinic Acid Esterification Kinetic Study with N-Butanol. Journal of Nanomaterials. 2019; 2019 ():1-14.

Chicago/Turabian Style

Angélica M. Escobar; Mirta N. Blanco; José J. Martínez; Jairo A. Cubillos; Gustavo P. Romanelli; Luis R. Pizzio. 2019. "Biomass Derivative Valorization Using Nano Core-Shell Magnetic Materials Based on Keggin-Heteropolyacids: Levulinic Acid Esterification Kinetic Study with N-Butanol." Journal of Nanomaterials 2019, no. : 1-14.

Journal article
Published: 22 April 2019 in Revista Facultad de Ingeniería Universidad de Antioquia
Reads 0
Downloads 0

Nb2O5 bulk and Nb2O5 modified with H2O2 were studied in the epoxidation of geraniol at 1 bar and room temperature. The structural and morphological properties for both catalysts were very similar, indicating that the peroxo-complex species were not formed. The order of the reaction was one respect to geraniol and close to zero respect to H2O2, these values fit well with the kinetic data obtained. The geraniol epoxidation is favored by the presence of peroxo groups, which is reached using an excess of H2O2. Moreover, the availability of the geraniol to adopt the three-membered-ring transition state was found as the best form for this type of compound.

ACS Style

Jairo Cubillos; José J. Martínez; Hugo Rojas; Norman Marín-Astorga. Oxidation of geraniol using niobia modified with hydrogen peroxide. Revista Facultad de Ingeniería Universidad de Antioquia 2019, 1 .

AMA Style

Jairo Cubillos, José J. Martínez, Hugo Rojas, Norman Marín-Astorga. Oxidation of geraniol using niobia modified with hydrogen peroxide. Revista Facultad de Ingeniería Universidad de Antioquia. 2019; (91):1.

Chicago/Turabian Style

Jairo Cubillos; José J. Martínez; Hugo Rojas; Norman Marín-Astorga. 2019. "Oxidation of geraniol using niobia modified with hydrogen peroxide." Revista Facultad de Ingeniería Universidad de Antioquia , no. 91: 1.

Journal article
Published: 02 February 2019 in Coatings
Reads 0
Downloads 0

The coating of polymeric substrate polyetheretherketone (PEEK) with silver nanoparticles (AgNPs) was carried out by a wet chemical route at room temperature. The coating process was developed from the Tollens reagent and D-glucose as reducing agent. The resulting composite exhibited antimicrobial activity. The PEEK films were coated with a single layer and two layers of silver nanoparticles in various concentrations. The crystallographic properties of the polymer and the silver nanoparticles were analyzed by X-ray diffraction (XRD). Fourier transform infrared spectra (FTIR) show the interaction between the silver nanoparticles with the polymeric substrate. Transmission electron microscope (TEM) images confirmed the obtaining of metallic nanoparticles with average sizes of 25 nm. It was possible to estimate the amount of silver deposited on PEEK with the help of thermogravimetric analysis. The morphology and shape of the AgNPs uniformly deposited on the PEEK films was ascertained by the techniques of scanning electron microscopy (SEM) and atomic force microscopy (AFM), evidencing the increase in the amount of silver by increasing the concentration of the metal precursor. Finally, the antibacterial activity of the films coated with Ag in Escherichia coli, Serratia marcescens and Bacillus licheniformis was evaluated, evidencing that the concentration of silver is crucial in the cellular replication of the bacteria.

ACS Style

Andrés Felipe Cruz-Pacheco; Deysi Tatiana Muñoz-Castiblanco; Jairo Alberto Gómez Cuaspud; Leonel Paredes-Madrid; Carlos Arturo Parra Vargas; José Jobanny Martínez Zambrano; Carlos Andrés Palacio Gómez. Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity. Coatings 2019, 9, 91 .

AMA Style

Andrés Felipe Cruz-Pacheco, Deysi Tatiana Muñoz-Castiblanco, Jairo Alberto Gómez Cuaspud, Leonel Paredes-Madrid, Carlos Arturo Parra Vargas, José Jobanny Martínez Zambrano, Carlos Andrés Palacio Gómez. Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity. Coatings. 2019; 9 (2):91.

Chicago/Turabian Style

Andrés Felipe Cruz-Pacheco; Deysi Tatiana Muñoz-Castiblanco; Jairo Alberto Gómez Cuaspud; Leonel Paredes-Madrid; Carlos Arturo Parra Vargas; José Jobanny Martínez Zambrano; Carlos Andrés Palacio Gómez. 2019. "Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity." Coatings 9, no. 2: 91.

Journal article
Published: 11 January 2019 in BISTUA REVISTA DE LA FACULTAD DE CIENCIAS BASICAS
Reads 0
Downloads 0

Para mejorar la actividad enzimática de las celulasas es necesario disminuir las barreras estructurales de la celulosa con distintos pretratamientos, en este trabajo se realizó el estudio del pretratamiento hidrotérmico de celulosa comercial a distintos factores de severidad, con el fin de mejorar la conversión a azucares reductores y disminuir la cristalinidad. Además, se estudió la degradación enzimática de la celulosa pretratada hidrotermicamente con celulasas comerciales previamente inmovilizadas en SiO2-NH2. Los resultados indican una mayor degradación de la celulosa tratada frente a la celulosa no tratada, a pesar que la actividad enzimática disminuye cuando las enzimas se inmovilizan. Este proceso es un tratamiento amigable con el medio ambiente.Palabras Clave: celulasas, pretratamiento hidrotérmico, factor de severidad

ACS Style

Annie Y. Vargas; Laura Luque; José J Martinez. Estudio del pretratamiento hidrotermico para favorecer la actividad de las celulasas libres e inmovilizadas. BISTUA REVISTA DE LA FACULTAD DE CIENCIAS BASICAS 2019, 16, 42 -55.

AMA Style

Annie Y. Vargas, Laura Luque, José J Martinez. Estudio del pretratamiento hidrotermico para favorecer la actividad de las celulasas libres e inmovilizadas. BISTUA REVISTA DE LA FACULTAD DE CIENCIAS BASICAS. 2019; 16 (1):42-55.

Chicago/Turabian Style

Annie Y. Vargas; Laura Luque; José J Martinez. 2019. "Estudio del pretratamiento hidrotermico para favorecer la actividad de las celulasas libres e inmovilizadas." BISTUA REVISTA DE LA FACULTAD DE CIENCIAS BASICAS 16, no. 1: 42-55.

Journal article
Published: 06 January 2019 in Molecular Catalysis
Reads 0
Downloads 0

The effect of the support (ZrO2, Al2O3, and TiO2) of Rh (1 wt%) catalysts for the hydrogenation of m-dinitrobenzene (m-DNB) in liquid phase was studied. The catalysts were reduced at 300 °C and characterized by EDS, TPR, TEM, N2 Adsorption, H2 chemisorption, XPS and Pyr-FTIR. Occurrence of partially reduced Rh species and metallic Rh is different among catalysts as evidenced by XPS. A typical SMSI effect was observed in Rh/TiO2 catalyst according to comparison of Hydrogen chemisorption and TEM results. Kinetic analysis of the m-DNB hydrogenation showed that the first step hydrogenation rate (m-DNB to m-NA, kinetic constant k1) is faster than the second one (m-NA to m-PDA, kinetic constant k2) and this depending on the catalyst. m-DNB preferentially adsorbs on electron deficient sites provided by Rhn+ species present in Rh/Al2O3 and Rh/TiO2 catalysts and depending on the relative amount of this sites the m-DNB is partially hydrogenated to m-NA. A direct correlation of k2/k1 ratio with the amount of Rh° was found.

ACS Style

José J. Martínez; Edna X. Aguilera; Jairo Cubillos; Hugo Rojas; Antonio Gómez-Cortés; Gabriela Díaz. Support effect of Rh catalysts on the hydrogenation of m-dinitrobenzene. Molecular Catalysis 2019, 465, 54 -60.

AMA Style

José J. Martínez, Edna X. Aguilera, Jairo Cubillos, Hugo Rojas, Antonio Gómez-Cortés, Gabriela Díaz. Support effect of Rh catalysts on the hydrogenation of m-dinitrobenzene. Molecular Catalysis. 2019; 465 ():54-60.

Chicago/Turabian Style

José J. Martínez; Edna X. Aguilera; Jairo Cubillos; Hugo Rojas; Antonio Gómez-Cortés; Gabriela Díaz. 2019. "Support effect of Rh catalysts on the hydrogenation of m-dinitrobenzene." Molecular Catalysis 465, no. : 54-60.