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

Prof. Dr. Andres Tomas Aguayo
Dept Chem Engn, Univ Basque Country, POB 644, Bilbao 48080, Spain

Basic Info

Basic Info is private.

Research Keywords & Expertise

0 Kinetic Modeling
0 Process Simulation
0 Sustainable catalytic processes
0 Zeolites and zeotypes
0 Added-value chemicals (olefins, fuels, aromatics)

Fingerprints

Kinetic Modeling
Process Simulation

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

Journal article
Published: 01 July 2018 in Journal of Industrial and Engineering Chemistry
Reads 0
Downloads 0

The kinetic behavior for methanol dehydration of different SAPOs (-11 and -18) and HZSM-5 zeolites (with different acidity and various acidity modification treatments) has been studied under the suitable conditions for the direct synthesis of dimethyl ether (DME) from H2 + CO + CO2. SAPO-11 shows a good performance for methanol dehydration, with DME yield above 80% and negligible paraffin formation, and has been assessed as acid function of a bifunctional catalyst in the single-stage synthesis of DME (with CuO-ZnO-ZrO2 as metallic function, metallic/acid mass ratio = 1/2). The bifunctional catalyst (CZZr/S-11) shows a stable kinetic behavior with high selectivity to DME (over 80%).

ACS Style

M. Sánchez-Contador; A. Ateka; A.T. Aguayo; J. Bilbao. Behavior of SAPO-11 as acid function in the direct synthesis of dimethyl ether from syngas and CO2. Journal of Industrial and Engineering Chemistry 2018, 63, 245 -254.

AMA Style

M. Sánchez-Contador, A. Ateka, A.T. Aguayo, J. Bilbao. Behavior of SAPO-11 as acid function in the direct synthesis of dimethyl ether from syngas and CO2. Journal of Industrial and Engineering Chemistry. 2018; 63 ():245-254.

Chicago/Turabian Style

M. Sánchez-Contador; A. Ateka; A.T. Aguayo; J. Bilbao. 2018. "Behavior of SAPO-11 as acid function in the direct synthesis of dimethyl ether from syngas and CO2." Journal of Industrial and Engineering Chemistry 63, no. : 245-254.

Journal article
Published: 01 May 2018 in Journal of Industrial and Engineering Chemistry
Reads 0
Downloads 0
ACS Style

Monica Gamero; Beatriz Valle; Pedro Castaño; Andres Tomas Aguayo; Javier Bilbao. Reaction network of the chloromethane conversion into light olefins using a HZSM-5 zeolite catalyst. Journal of Industrial and Engineering Chemistry 2018, 61, 427 -436.

AMA Style

Monica Gamero, Beatriz Valle, Pedro Castaño, Andres Tomas Aguayo, Javier Bilbao. Reaction network of the chloromethane conversion into light olefins using a HZSM-5 zeolite catalyst. Journal of Industrial and Engineering Chemistry. 2018; 61 ():427-436.

Chicago/Turabian Style

Monica Gamero; Beatriz Valle; Pedro Castaño; Andres Tomas Aguayo; Javier Bilbao. 2018. "Reaction network of the chloromethane conversion into light olefins using a HZSM-5 zeolite catalyst." Journal of Industrial and Engineering Chemistry 61, no. : 427-436.

Journal article
Published: 26 April 2018 in Applied Sciences
Reads 0
Downloads 0

The direct synthesis of dimethyl ether (DME) is an ideal process to achieve the environmental objective of CO2 conversion together with the economic objective of DME production. The effect of the reaction conditions (temperature, pressure, space time) and feed composition (ternary mixtures of H2 + CO + CO2 with different CO2/CO and H2/COx molar ratios) on the reaction indices (COx conversion, product yield and selectivity, CO2 conversion) has been studied by means of experiments carried out in a fixed-bed reactor, with a CuO-ZnO-MnO/SAPO-18 catalyst, in order to establish suitable ranges of operating conditions for enhancing the individual objectives of CO2 conversion and DME yield. The optimums of these two objectives are achieved in opposite conditions, and for striking a good balance between both objectives, the following conditions are suitable: 275–300 °C; 20–30 bar; 2.5–5 gcat h (molC)−1 and a H2/COx molar ratio in the feed of 3. CO2/CO molar ratio in the feed is of great importance. Ratios below 1/3 are suitable for enhancing DME production, whereas CO2/CO ratios above 1 improve the conversion of CO2. This conversion of CO2 in the overall process of DME synthesis is favored by the reverse water gas shift equation, since CO is more active than CO2 in the methanol synthesis reaction.

ACS Style

Ainara Ateka; Javier Ereña; Miguel Sánchez-Contador; Paula Perez-Uriarte; Javier Bilbao; Andrés T. Aguayo. Capability of the Direct Dimethyl Ether Synthesis Process for the Conversion of Carbon Dioxide. Applied Sciences 2018, 8, 677 .

AMA Style

Ainara Ateka, Javier Ereña, Miguel Sánchez-Contador, Paula Perez-Uriarte, Javier Bilbao, Andrés T. Aguayo. Capability of the Direct Dimethyl Ether Synthesis Process for the Conversion of Carbon Dioxide. Applied Sciences. 2018; 8 (5):677.

Chicago/Turabian Style

Ainara Ateka; Javier Ereña; Miguel Sánchez-Contador; Paula Perez-Uriarte; Javier Bilbao; Andrés T. Aguayo. 2018. "Capability of the Direct Dimethyl Ether Synthesis Process for the Conversion of Carbon Dioxide." Applied Sciences 8, no. 5: 677.

Article
Published: 24 January 2018 in Reaction Kinetics, Mechanisms and Catalysis
Reads 0
Downloads 0

Three catalytic bed configurations for the direct DME synthesis have been studied using CuO–ZnO–MnO and SAPO-18 as metallic and acid functions, respectively. The runs have been carried out in a fixed bed reactor under the following conditions: Feed, H2 + CO + CO2; 275 °C; 30 bar; 5.02 gcat h mol C−1; H2/COx = 3. The results (COX conversion, DME yield and selectivity) show that a better contact between phases, thus, incorporating both functions in a bifunctional catalyst (CZMn/S-18) results in a mayor DME yield and selectivity than the other configurations. The effects of the fed CO2 content and reaction temperature have been assessed for the bifunctional catalyst. Although the production of DME decreases with co-feeding CO2 with syngas, for a CO2/(CO2 + CO) ratio in the feed higher than 0.5 this effect is attenuated, which is interesting for the conversion of CO2. The highest DME selectivity (> 94%) is obtained at 275 °C, with moderate deactivation by coke.

ACS Style

Ainara Ateka; Miguel Sánchez-Contador; Javier Ereña; Andres Tomas Aguayo; Javier Bilbao. Catalyst configuration for the direct synthesis of dimethyl ether from CO and CO2 hydrogenation on CuO–ZnO–MnO/SAPO-18 catalysts. Reaction Kinetics, Mechanisms and Catalysis 2018, 124, 401 -418.

AMA Style

Ainara Ateka, Miguel Sánchez-Contador, Javier Ereña, Andres Tomas Aguayo, Javier Bilbao. Catalyst configuration for the direct synthesis of dimethyl ether from CO and CO2 hydrogenation on CuO–ZnO–MnO/SAPO-18 catalysts. Reaction Kinetics, Mechanisms and Catalysis. 2018; 124 (1):401-418.

Chicago/Turabian Style

Ainara Ateka; Miguel Sánchez-Contador; Javier Ereña; Andres Tomas Aguayo; Javier Bilbao. 2018. "Catalyst configuration for the direct synthesis of dimethyl ether from CO and CO2 hydrogenation on CuO–ZnO–MnO/SAPO-18 catalysts." Reaction Kinetics, Mechanisms and Catalysis 124, no. 1: 401-418.

Research article
Published: 22 January 2018 in Industrial & Engineering Chemistry Research
Reads 0
Downloads 0

Zr incorporation in the CuO-ZnO catalyst for methanol synthesis from CO+CO2 mixtures, for its later use in the bifunctional catalyst conformation for dimethyl ether (DME) direct synthesis has been studied. Different Cu/Zn/Zr ratio catalysts were prepared, via co-precipitation method, and characterized regarding to physical, chemical, structural and metallic properties. Specific Cu surface area and dispersion are responsible for boosting the activity of CuO-ZnO based catalysts, which increases when incorporating ZrO2. Based on the kinetic behavior (COx conversion and methanol yield and selectivity) and stability in the methanol synthesis, CZZr1 (Cu:Zn:Zr = 2:1:1) was selected as the most suitable metallic function, with 8.14 % of COx conversion and methanol selectivity over 98 %. A bifunctional catalyst was prepared by physical mixture of CZZr1 with SAPO-11. The bifunctional catalyst activity was tested on the DME direct synthesis, showing a good performance providing a high DME yield and selectivity, with a noticeable stability.

ACS Style

Miguel Sánchez-Contador; Ainara Ateka; Pablo Rodriguez-Vega; Javier Bilbao; Andres Tomas Aguayo. Optimization of the Zr Content in the CuO-ZnO-ZrO2/SAPO-11 Catalyst for the Selective Hydrogenation of CO+CO2 Mixtures in the Direct Synthesis of Dimethyl Ether. Industrial & Engineering Chemistry Research 2018, 57, 1169 -1178.

AMA Style

Miguel Sánchez-Contador, Ainara Ateka, Pablo Rodriguez-Vega, Javier Bilbao, Andres Tomas Aguayo. Optimization of the Zr Content in the CuO-ZnO-ZrO2/SAPO-11 Catalyst for the Selective Hydrogenation of CO+CO2 Mixtures in the Direct Synthesis of Dimethyl Ether. Industrial & Engineering Chemistry Research. 2018; 57 (4):1169-1178.

Chicago/Turabian Style

Miguel Sánchez-Contador; Ainara Ateka; Pablo Rodriguez-Vega; Javier Bilbao; Andres Tomas Aguayo. 2018. "Optimization of the Zr Content in the CuO-ZnO-ZrO2/SAPO-11 Catalyst for the Selective Hydrogenation of CO+CO2 Mixtures in the Direct Synthesis of Dimethyl Ether." Industrial & Engineering Chemistry Research 57, no. 4: 1169-1178.

Research article
Published: 12 January 2018 in Industrial & Engineering Chemistry Research
Reads 0
Downloads 0

The conversion of chloromethane into light olefins over a HZSM-5 zeolite based catalyst is investigated with the aim of establishing a kinetic model suitable for simulating this process for indirect valorization of the methane contained in shale gas. The experimental data were obtained in an isothermal fixed bed reactor under a wide range of operating conditions: temperature, 300-450 ºC; space-time, 1-12 gcatalyst h/molCH2; chloromethane partial pressure, 0.375-1.5 atm, and time on stream, up to 255 min. The reaction scheme is composed of eight components and lumps (chloromethane, C2-C4 olefins, C2-C4 paraffins, C5-C10 aliphatics, aromatics BTX, methane, hydrochloric acid, and chlorinated hydrocarbons), which are involved in ten single reactions. The catalyst deactivation by coke deposition has been quantified by an equation, which is dependent on the concentration of chloromethane in the reaction medium. The kinetic model is suitable for predicting accurately the effect that reaction conditions have on products distribution and their evolution with time on stream.

ACS Style

Mónica Gamero; Beatriz Valle; Ana Guadalupe Gayubo; Pedro Castaño; Andres Tomas Aguayo; Javier Bilbao. Kinetic Model for the Conversion of Chloromethane into Hydrocarbons over a HZSM-5 Zeolite Catalyst. Industrial & Engineering Chemistry Research 2018, 57, 908 -919.

AMA Style

Mónica Gamero, Beatriz Valle, Ana Guadalupe Gayubo, Pedro Castaño, Andres Tomas Aguayo, Javier Bilbao. Kinetic Model for the Conversion of Chloromethane into Hydrocarbons over a HZSM-5 Zeolite Catalyst. Industrial & Engineering Chemistry Research. 2018; 57 (3):908-919.

Chicago/Turabian Style

Mónica Gamero; Beatriz Valle; Ana Guadalupe Gayubo; Pedro Castaño; Andres Tomas Aguayo; Javier Bilbao. 2018. "Kinetic Model for the Conversion of Chloromethane into Hydrocarbons over a HZSM-5 Zeolite Catalyst." Industrial & Engineering Chemistry Research 57, no. 3: 908-919.

Journal article
Published: 01 January 2018 in Chemical Engineering Journal
Reads 0
Downloads 0
ACS Style

Tomás Cordero-Lanzac; Andres Tomas Aguayo; Ana G. Gayubo; Pedro Castaño; Javier Bilbao. Simultaneous modeling of the kinetics for n-pentane cracking and the deactivation of a HZSM-5 based catalyst. Chemical Engineering Journal 2018, 331, 818 -830.

AMA Style

Tomás Cordero-Lanzac, Andres Tomas Aguayo, Ana G. Gayubo, Pedro Castaño, Javier Bilbao. Simultaneous modeling of the kinetics for n-pentane cracking and the deactivation of a HZSM-5 based catalyst. Chemical Engineering Journal. 2018; 331 ():818-830.

Chicago/Turabian Style

Tomás Cordero-Lanzac; Andres Tomas Aguayo; Ana G. Gayubo; Pedro Castaño; Javier Bilbao. 2018. "Simultaneous modeling of the kinetics for n-pentane cracking and the deactivation of a HZSM-5 based catalyst." Chemical Engineering Journal 331, no. : 818-830.

Journal article
Published: 01 November 2017 in International Journal of Hydrogen Energy
Reads 0
Downloads 0
ACS Style

Ainara Ateka; Javier Ereña; Paula Pérez-Uriarte; Andrés T. Aguayo; Javier Bilbao. Effect of the content of CO 2 and H 2 in the feed on the conversion of CO 2 in the direct synthesis of dimethyl ether over a CuO ZnO Al 2 O 3 /SAPO-18 catalyst. International Journal of Hydrogen Energy 2017, 42, 27130 -27138.

AMA Style

Ainara Ateka, Javier Ereña, Paula Pérez-Uriarte, Andrés T. Aguayo, Javier Bilbao. Effect of the content of CO 2 and H 2 in the feed on the conversion of CO 2 in the direct synthesis of dimethyl ether over a CuO ZnO Al 2 O 3 /SAPO-18 catalyst. International Journal of Hydrogen Energy. 2017; 42 (44):27130-27138.

Chicago/Turabian Style

Ainara Ateka; Javier Ereña; Paula Pérez-Uriarte; Andrés T. Aguayo; Javier Bilbao. 2017. "Effect of the content of CO 2 and H 2 in the feed on the conversion of CO 2 in the direct synthesis of dimethyl ether over a CuO ZnO Al 2 O 3 /SAPO-18 catalyst." International Journal of Hydrogen Energy 42, no. 44: 27130-27138.

Journal article
Published: 01 September 2017 in Microporous and Mesoporous Materials
Reads 0
Downloads 0
ACS Style

Irene Sierra; Unai Iriarte-Velasco; Mónica Gamero; Andrés T. Aguayo. Upgrading of sewage sludge by demineralization and physical activation with CO 2 : Application for methylene blue and phenol removal. Microporous and Mesoporous Materials 2017, 250, 88 -99.

AMA Style

Irene Sierra, Unai Iriarte-Velasco, Mónica Gamero, Andrés T. Aguayo. Upgrading of sewage sludge by demineralization and physical activation with CO 2 : Application for methylene blue and phenol removal. Microporous and Mesoporous Materials. 2017; 250 ():88-99.

Chicago/Turabian Style

Irene Sierra; Unai Iriarte-Velasco; Mónica Gamero; Andrés T. Aguayo. 2017. "Upgrading of sewage sludge by demineralization and physical activation with CO 2 : Application for methylene blue and phenol removal." Microporous and Mesoporous Materials 250, no. : 88-99.

Article
Published: 30 August 2017 in Catalysts
Reads 0
Downloads 0

The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the matrix) has been analyzed by comparing the properties of the fresh and deactivated catalyst after runs at different temperatures, while the nature of those species has been studied using different spectroscopic and thermogravimetric techniques. The reaction occurs on the strongest acid sites of the zeolite micropores through olefins and alkyl-benzenes as intermediates. These species also condensate into bulkier structures (polyaromatics named as coke), particularly at higher temperatures and within the meso- and macropores of the matrix. The critical roles of the matrix and water in the reaction medium have been proved: both attenuating the effect of coke deposition.

ACS Style

María Ibáñez; Paula Pérez-Uriarte; Miguel Sánchez-Contador; Tomás Cordero-Lanzac; Andrés T. Aguayo; Javier Bilbao; Pedro Castaño. Nature and Location of Carbonaceous Species in a Composite HZSM-5 Zeolite Catalyst during the Conversion of Dimethyl Ether into Light Olefins. Catalysts 2017, 7, 254 .

AMA Style

María Ibáñez, Paula Pérez-Uriarte, Miguel Sánchez-Contador, Tomás Cordero-Lanzac, Andrés T. Aguayo, Javier Bilbao, Pedro Castaño. Nature and Location of Carbonaceous Species in a Composite HZSM-5 Zeolite Catalyst during the Conversion of Dimethyl Ether into Light Olefins. Catalysts. 2017; 7 (9):254.

Chicago/Turabian Style

María Ibáñez; Paula Pérez-Uriarte; Miguel Sánchez-Contador; Tomás Cordero-Lanzac; Andrés T. Aguayo; Javier Bilbao; Pedro Castaño. 2017. "Nature and Location of Carbonaceous Species in a Composite HZSM-5 Zeolite Catalyst during the Conversion of Dimethyl Ether into Light Olefins." Catalysts 7, no. 9: 254.

Journal article
Published: 26 August 2017 in Applied Catalysis A: General
Reads 0
Downloads 0

The performance of SAPO-18 and SAPO-34 catalysts has been compared during the conversion of ethylene or 1-butene to propylene. This comparison has been made in terms of activity (conversion), selectivity and stability against coke deposition. The SAPOs were synthesized, agglomerated, calcined, characterized and tested in a fixed-bed reactor at 500 °C. The spent catalysts (after 5 h on stream) were characterized to assign the location and nature of coke. The results point to the higher activity and stability of SAPO-18 catalyst in the conversions of each reactant (ethylene or 1-butene), which has been explained on the basis of its acidity, pore topology and above all, the faster diffusion of aromatics causing deactivation. Thus, the SAPO-18 catalyst suffers slower coke deposition, while this coke is of lighter nature (more aliphatic and less aromatic). The advantages of SAPO-18 over SAPO-34 catalyst are more relevant for the transformation of 1-butene, where the propylene selectivity and yield increase over time, as secondary reactions are selectively neglected and coke condensation is slowed down.

ACS Style

Eva Epelde; María Ibáñez; José Valecillos; Andrés T. Aguayo; Ana G. Gayubo; Javier Bilbao; Pedro Castaño. SAPO-18 and SAPO-34 catalysts for propylene production from the oligomerization-cracking of ethylene or 1-butene. Applied Catalysis A: General 2017, 547, 176 -182.

AMA Style

Eva Epelde, María Ibáñez, José Valecillos, Andrés T. Aguayo, Ana G. Gayubo, Javier Bilbao, Pedro Castaño. SAPO-18 and SAPO-34 catalysts for propylene production from the oligomerization-cracking of ethylene or 1-butene. Applied Catalysis A: General. 2017; 547 ():176-182.

Chicago/Turabian Style

Eva Epelde; María Ibáñez; José Valecillos; Andrés T. Aguayo; Ana G. Gayubo; Javier Bilbao; Pedro Castaño. 2017. "SAPO-18 and SAPO-34 catalysts for propylene production from the oligomerization-cracking of ethylene or 1-butene." Applied Catalysis A: General 547, no. : 176-182.

Journal article
Published: 01 August 2017 in Applied Catalysis A: General
Reads 0
Downloads 0
ACS Style

María Ibáñez; Eva Epelde; Andres Tomas Aguayo; Ana G. Gayubo; Javier Bilbao; Pedro Castaño. Selective dealumination of HZSM-5 zeolite boosts propylene by modifying 1-butene cracking pathway. Applied Catalysis A: General 2017, 543, 1 -9.

AMA Style

María Ibáñez, Eva Epelde, Andres Tomas Aguayo, Ana G. Gayubo, Javier Bilbao, Pedro Castaño. Selective dealumination of HZSM-5 zeolite boosts propylene by modifying 1-butene cracking pathway. Applied Catalysis A: General. 2017; 543 ():1-9.

Chicago/Turabian Style

María Ibáñez; Eva Epelde; Andres Tomas Aguayo; Ana G. Gayubo; Javier Bilbao; Pedro Castaño. 2017. "Selective dealumination of HZSM-5 zeolite boosts propylene by modifying 1-butene cracking pathway." Applied Catalysis A: General 543, no. : 1-9.

Journal article
Published: 01 March 2017 in Chemical Engineering Journal
Reads 0
Downloads 0
ACS Style

Paula Pérez-Uriarte; Ainara Ateka; Ana G. Gayubo; Tomás Cordero-Lanzac; Andrés T. Aguayo; Javier Bilbao. Deactivation kinetics for the conversion of dimethyl ether to olefins over a HZSM-5 zeolite catalyst. Chemical Engineering Journal 2017, 311, 367 -377.

AMA Style

Paula Pérez-Uriarte, Ainara Ateka, Ana G. Gayubo, Tomás Cordero-Lanzac, Andrés T. Aguayo, Javier Bilbao. Deactivation kinetics for the conversion of dimethyl ether to olefins over a HZSM-5 zeolite catalyst. Chemical Engineering Journal. 2017; 311 ():367-377.

Chicago/Turabian Style

Paula Pérez-Uriarte; Ainara Ateka; Ana G. Gayubo; Tomás Cordero-Lanzac; Andrés T. Aguayo; Javier Bilbao. 2017. "Deactivation kinetics for the conversion of dimethyl ether to olefins over a HZSM-5 zeolite catalyst." Chemical Engineering Journal 311, no. : 367-377.

Journal article
Published: 01 February 2017 in Energy
Reads 0
Downloads 0
ACS Style

Ainara Ateka; Paula Pérez-Uriarte; Mónica Gamero; Javier Ereña; Andres Tomas Aguayo; Javier Bilbao. A comparative thermodynamic study on the CO2 conversion in the synthesis of methanol and of DME. Energy 2017, 120, 796 -804.

AMA Style

Ainara Ateka, Paula Pérez-Uriarte, Mónica Gamero, Javier Ereña, Andres Tomas Aguayo, Javier Bilbao. A comparative thermodynamic study on the CO2 conversion in the synthesis of methanol and of DME. Energy. 2017; 120 ():796-804.

Chicago/Turabian Style

Ainara Ateka; Paula Pérez-Uriarte; Mónica Gamero; Javier Ereña; Andres Tomas Aguayo; Javier Bilbao. 2017. "A comparative thermodynamic study on the CO2 conversion in the synthesis of methanol and of DME." Energy 120, no. : 796-804.

Journal article
Published: 01 November 2016 in Fuel Processing Technology
Reads 0
Downloads 0
ACS Style

Ainara Ateka; Irene Sierra; Javier Ereña; Javier Bilbao; Andrés T. Aguayo. Performance of CuO–ZnO–ZrO 2 and CuO–ZnO–MnO as metallic functions and SAPO-18 as acid function of the catalyst for the synthesis of DME co-feeding CO 2. Fuel Processing Technology 2016, 152, 34 -45.

AMA Style

Ainara Ateka, Irene Sierra, Javier Ereña, Javier Bilbao, Andrés T. Aguayo. Performance of CuO–ZnO–ZrO 2 and CuO–ZnO–MnO as metallic functions and SAPO-18 as acid function of the catalyst for the synthesis of DME co-feeding CO 2. Fuel Processing Technology. 2016; 152 ():34-45.

Chicago/Turabian Style

Ainara Ateka; Irene Sierra; Javier Ereña; Javier Bilbao; Andrés T. Aguayo. 2016. "Performance of CuO–ZnO–ZrO 2 and CuO–ZnO–MnO as metallic functions and SAPO-18 as acid function of the catalyst for the synthesis of DME co-feeding CO 2." Fuel Processing Technology 152, no. : 34-45.

Journal article
Published: 01 November 2016 in International Journal of Hydrogen Energy
Reads 0
Downloads 0

Et al.The perovskite La0.15Sm0.35Sr0.08Ba0.42FeO3-δ has been prepared by the glycine nitrate route, varying the calcination temperature, fuel/oxidizer ratio and cooling rate, in order to study the sample preparation influence on the properties in the context of their application as a electrode material for SOFCs. The obtained materials have been characterized by X-ray diffraction, scanning electron microscopy, electrical and BET surface area measurements, and also the reaction between oxygen and CO, which can occur in SOFCs during the conversion of chemical energy into electrical energy. As overall results, all the samples present a phase segregation showing two perovskites with rhombohedral structure. SEM images show a well-necked morphology of the powders which are composed of nanosized particles and agglomerations of grains. The BET specific surface area of the samples decreases as calcination temperature increases, as well as for the quenched sample. The measured electronic conductivity values (<50 S/cm) are characteristic for samples with these high values of σ(r) (A cation size disorder). The catalytic activity tests for the CO oxidation reaction showed a T50% (“light-off temperature”, defined as the temperature at which 50% conversion of CO is achieved) value about 440°C–450 °C, CO conversion reaching 100% at approximately 600 °C for all the prepared perovskites. Then, for the La0.15Sm0.35Sr0.08Ba0.42FeO3-δ perovskite, CO conversion temperature is lower than usual SOFCs operating temperature. This points out to the technological interest of these materials in the framework of reducing the operating temperature of SOFCs.This research has been funded by the Ministerio de Ciencia e Innovación (CONSOLIDER-INGENIO 2010 CSD2009-00013), Ministerio de Economía y Competitividad (MAT2013-42092-R and MAT2012-30763), the Feder program of the Europen Union and Dpto. Educación, Política Lingüística y Cultura of the Basque Goverment (IT-630-13). The authors thank for technical and human support provided by SGIker of UPV/EHU. K. Vidal thanks UPV/EHU for funding.Peer Reviewe

ACS Style

K. Vidal; Aitor Larrañaga; A. Morán-Ruiz; Andres Tomas Aguayo; Miguel Laguna-Bercero; M.P. Yeste; José Juan Calvino; M.I. Arriortua. Effect of synthesis conditions on electrical and catalytical properties of perovskites with high value of A-site cation size mismatch. International Journal of Hydrogen Energy 2016, 41, 19810 -19818.

AMA Style

K. Vidal, Aitor Larrañaga, A. Morán-Ruiz, Andres Tomas Aguayo, Miguel Laguna-Bercero, M.P. Yeste, José Juan Calvino, M.I. Arriortua. Effect of synthesis conditions on electrical and catalytical properties of perovskites with high value of A-site cation size mismatch. International Journal of Hydrogen Energy. 2016; 41 (43):19810-19818.

Chicago/Turabian Style

K. Vidal; Aitor Larrañaga; A. Morán-Ruiz; Andres Tomas Aguayo; Miguel Laguna-Bercero; M.P. Yeste; José Juan Calvino; M.I. Arriortua. 2016. "Effect of synthesis conditions on electrical and catalytical properties of perovskites with high value of A-site cation size mismatch." International Journal of Hydrogen Energy 41, no. 43: 19810-19818.

Journal article
Published: 01 October 2016 in Chemical Engineering Journal
Reads 0
Downloads 0

A kinetic model of 11 lumps (dimethyl ether, methanol, water, ethylene, propylene, butenes, C2-C4 paraffins, C5+ hydrocarbons, BTX aromatics, methane and CO) has been determined for the reaction of DME to olefins (DTO process) over a HZSM-5 zeolite catalyst (SiO2/Al2O3 = 280) agglomerated with boehmite. The experiments have been carried out under a slightly above than at 1.5 bar in an isothermal fixed bed reactor under a wide range of operating conditions: 598-673 K; space time, 0.2-6 gcat h molC-1; feed, pure DME and co-fed with He, methanol and water. The model characterizes the effect of the reaction conditions (temperature, space time and feed composition) over the product distribution at zero time on stream. The kinetic constant of DME conversion to olefins (at 623 K) is 20 times greater than that of methanol conversion. This result and the non-existence of the methanol dehydration step are the main differences between both processes. These differences have a great impact on the advance of the reaction and on the yield and distribution of product fractions.

ACS Style

Paula Pérez-Uriarte; Ainara Ateka; Andres Tomas Aguayo; Ana G. Gayubo; Javier Bilbao. Kinetic model for the reaction of DME to olefins over a HZSM-5 zeolite catalyst. Chemical Engineering Journal 2016, 302, 801 -810.

AMA Style

Paula Pérez-Uriarte, Ainara Ateka, Andres Tomas Aguayo, Ana G. Gayubo, Javier Bilbao. Kinetic model for the reaction of DME to olefins over a HZSM-5 zeolite catalyst. Chemical Engineering Journal. 2016; 302 ():801-810.

Chicago/Turabian Style

Paula Pérez-Uriarte; Ainara Ateka; Andres Tomas Aguayo; Ana G. Gayubo; Javier Bilbao. 2016. "Kinetic model for the reaction of DME to olefins over a HZSM-5 zeolite catalyst." Chemical Engineering Journal 302, no. : 801-810.

Article
Published: 22 August 2016 in Catalysis Letters
Reads 0
Downloads 0

The catalytic transformation of dimethyl ether (DME) for the selective production of light olefins has been studied over HZSM-5 zeolite (with SiO2/Al2O3 = 280) and silicoaluminophosphate (SAPO-18 and -34) based catalysts in order to asses the effect of shape selectivity on the catalytic performance. The catalysts have been synthesized by agglomerating the active materials with bentonite (as a binder) and alpha-alumina (as inert filler). The runs have been carried out at a pressure of 1.5 bar in a fixed bed reactor, under the following reaction conditions: temperature, 350 and 400 °C; space time, 1.6 and 0.064 gcatalyst h molC−1; time on stream, 60 min. The results reveal the importance of the severity of the shape selectivity of the catalysts on the reaction indices (conversion, yield and selectivity of olefins, and catalyst stability). The HZSM-5 zeolite based catalyst has the best kinetic behavior, being stable at 350 °C, with a DME conversion of 4.5 % and selectivity to ethylene, propylene and butenes of 27, 50 and 16 %, respectively.

ACS Style

Paula Pérez-Uriarte; Ainara Ateka; Andrés T. Aguayo; Javier Bilbao. Comparison of HZSM-5 Zeolite and SAPO (-18 and -34) Based Catalysts for the Production of Light Olefins from DME. Catalysis Letters 2016, 146, 1892 -1902.

AMA Style

Paula Pérez-Uriarte, Ainara Ateka, Andrés T. Aguayo, Javier Bilbao. Comparison of HZSM-5 Zeolite and SAPO (-18 and -34) Based Catalysts for the Production of Light Olefins from DME. Catalysis Letters. 2016; 146 (10):1892-1902.

Chicago/Turabian Style

Paula Pérez-Uriarte; Ainara Ateka; Andrés T. Aguayo; Javier Bilbao. 2016. "Comparison of HZSM-5 Zeolite and SAPO (-18 and -34) Based Catalysts for the Production of Light Olefins from DME." Catalysis Letters 146, no. 10: 1892-1902.

Journal article
Published: 13 August 2016 in International Journal of Hydrogen Energy
Reads 0
Downloads 0

A high-pressure fixed-bed reactor has been used for the direct synthesis of dimethyl ether (DME) from syngas, through a single-step process using a CuOZnOMnO/SAPO-18 (CZMn/S) bifunctional catalyst. The effects of temperature (250–350 °C), space time (2.5–20 gcat h (molC)−1), reaction pressure (20–40 bar) and time on stream have been studied. The results show that suitable conditions for attaining high yield and selectivity of DME are 275–300 °C, with moderate reaction pressure (30 bar). For space time values above 5 gcat h (molC)−1, the catalyst acquires a pseudo-steady state of constant activity. The need of purifying the syngas feed (free of olefins and/or paraffins) in order to avoid the activation of the hydrocarbon pool has also been evidenced. Deactivation of CZMn/S is mainly caused by coke deposition, and three types of coke are distinguished based on its location on the catalyst: i) metal surface, ii) interface metal-MnO, and iii) acid function.

ACS Style

Ainara Ateka; Paula Pérez-Uriarte; Miguel Sánchez-Contador; Javier Ereña; Andrés T. Aguayo; Javier Bilbao. Direct synthesis of dimethyl ether from syngas on CuO ZnO MnO/SAPO-18 bifunctional catalyst. International Journal of Hydrogen Energy 2016, 41, 18015 -18026.

AMA Style

Ainara Ateka, Paula Pérez-Uriarte, Miguel Sánchez-Contador, Javier Ereña, Andrés T. Aguayo, Javier Bilbao. Direct synthesis of dimethyl ether from syngas on CuO ZnO MnO/SAPO-18 bifunctional catalyst. International Journal of Hydrogen Energy. 2016; 41 (40):18015-18026.

Chicago/Turabian Style

Ainara Ateka; Paula Pérez-Uriarte; Miguel Sánchez-Contador; Javier Ereña; Andrés T. Aguayo; Javier Bilbao. 2016. "Direct synthesis of dimethyl ether from syngas on CuO ZnO MnO/SAPO-18 bifunctional catalyst." International Journal of Hydrogen Energy 41, no. 40: 18015-18026.

Article
Published: 22 July 2016 in Reaction Kinetics, Mechanisms and Catalysis
Reads 0
Downloads 0

The study has focused on the regenerability of the CuO–ZnO–MnO/SAPO-18 (CZMn/S) bifunctional catalyst used in the direct synthesis of dimethyl ether (STD process) from H2 + CO + CO2 feeds. The runs have been conducted in a fixed bed reactor under the following conditions: 250–300 °C; 10–40 bar; 1.25–10.18 gcat h mol C −1 ; time on stream, 5–30 h; CO2/CO molar ratio, 0–1; feeding H2 + CO + CO2 with a H2/COx molar ratio of 3. Coke deposition has been determined as the main deactivation cause, and both the measurement of the coke content and the identification of three types of coke have been carried out by means of temperature programmed oxidation analyses. Reaction-regeneration cycle runs have been carried out in a fixed bed isothermal reactor, concluding that it is possible to regenerate the bifunctional catalyst by the combustion of coke with air, at 300 °C (48 h). Under these conditions, the catalyst undergoes a slight Cu sintering in the first reaction-regeneration cycle but recovers completely the remaining activity in the successive cycles.

ACS Style

Ainara Ateka; Paula Pérez-Uriarte; Irene Sierra; Javier Ereña; Javier Bilbao; Andres Tomas Aguayo. Regenerability of the CuO–ZnO–MnO/SAPO-18 catalyst used in the synthesis of dimethyl ether in a single step. Reaction Kinetics, Mechanisms and Catalysis 2016, 119, 655 -670.

AMA Style

Ainara Ateka, Paula Pérez-Uriarte, Irene Sierra, Javier Ereña, Javier Bilbao, Andres Tomas Aguayo. Regenerability of the CuO–ZnO–MnO/SAPO-18 catalyst used in the synthesis of dimethyl ether in a single step. Reaction Kinetics, Mechanisms and Catalysis. 2016; 119 (2):655-670.

Chicago/Turabian Style

Ainara Ateka; Paula Pérez-Uriarte; Irene Sierra; Javier Ereña; Javier Bilbao; Andres Tomas Aguayo. 2016. "Regenerability of the CuO–ZnO–MnO/SAPO-18 catalyst used in the synthesis of dimethyl ether in a single step." Reaction Kinetics, Mechanisms and Catalysis 119, no. 2: 655-670.