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An original kinetic model has been used to describe the performance of an original CuO–ZnO–[email protected] bifunctional catalyst on the one-stage synthesis of dimethyl ether (DME) from CO/CO2 hydrogenation. The model considers that certain individual reactions (the synthesis of methanol and the reverse water gas shift) occur in the metallic function (core) of the catalyst particle, whereas others (methanol dehydration) take place in the shell (acid function), and that the progress of these reactions is conditioned by the diffusion of the components. The kinetic parameters of the individual reactions and the deactivation kinetics have been calculated from experimental data obtained in a wide conditions range (H2/COx ratio, 2.5–4; CO2/COx ratio, 0–1; 10–50 bar; 250–325 °C; 1.25–20 g h molC−1). The use of the model for simulating the packed bed reactor has allowed evaluating the influence of the reaction conditions, as well as assessing the effect of the catalysts particle size. The model predicts DME yields of 64% for syngas (H2+CO) feeds, 38% for CO2/COx ratio of 0.50 and 17% for H2/CO2, respectively, at 70 bar and 290 °C. The maximum conversion of CO2 predicted by the model for the same space time value and temperature surpasses 30% for H2+CO2 feedstocks at 70 bar, greater than the experimental value obtained at 50 bar at the same temperature (∼25%).
Ainara Ateka; Ander Portillo; Miguel Sánchez-Contador; Javier Bilbao; Andres T. Aguayo. Macro-kinetic model for CuO–ZnO–[email protected] core-shell catalyst in the direct synthesis of DME from CO/CO2. Renewable Energy 2021, 169, 1242 -1251.
AMA StyleAinara Ateka, Ander Portillo, Miguel Sánchez-Contador, Javier Bilbao, Andres T. Aguayo. Macro-kinetic model for CuO–ZnO–[email protected] core-shell catalyst in the direct synthesis of DME from CO/CO2. Renewable Energy. 2021; 169 ():1242-1251.
Chicago/Turabian StyleAinara Ateka; Ander Portillo; Miguel Sánchez-Contador; Javier Bilbao; Andres T. Aguayo. 2021. "Macro-kinetic model for CuO–ZnO–[email protected] core-shell catalyst in the direct synthesis of DME from CO/CO2." Renewable Energy 169, no. : 1242-1251.
The direct synthesis of dimethyl ether (DME) by the hydrogenation of CO2 and CO2/COx mixtures has been studied in an original packed bed membrane reactor (PBMR). The role of the hydrophilic LTA zeolite membrane is to remove H2O from the reaction medium, reducing therefore the thermodynamic limitations of methanol synthesis and dehydration stages. LTA zeolite has the best permeation properties among the studied zeolites (LTX and SOD). The experiments were carried out using a CuO-ZnO-ZrO2/SAPO-11 catalyst at 275–325 °C, 10–40 bar, space time of 10 gcat h (molC)−1 and using in the permeate section a sweeping gas flowrate of the same composition as that fed to the reaction section. The results (DME yield, CO2 conversion and product distribution) of the PBMR are compared with those obtained in PBR without membrane. In the hydrogenation of CO2, a DME yield of 12% and a CO2 conversion of 20% are obtained at 275 °C, 40 bar and space time of 10 gcat h (molC)−1 with a great catalyst stability.
Pablo Rodriguez-Vega; Ainara Ateka; Izumi Kumakiri; Hector Vicente; Javier Ereña; Andres T. Aguayo; Javier Bilbao. Experimental implementation of a catalytic membrane reactor for the direct synthesis of DME from H2+CO/CO2. Chemical Engineering Science 2021, 234, 116396 .
AMA StylePablo Rodriguez-Vega, Ainara Ateka, Izumi Kumakiri, Hector Vicente, Javier Ereña, Andres T. Aguayo, Javier Bilbao. Experimental implementation of a catalytic membrane reactor for the direct synthesis of DME from H2+CO/CO2. Chemical Engineering Science. 2021; 234 ():116396.
Chicago/Turabian StylePablo Rodriguez-Vega; Ainara Ateka; Izumi Kumakiri; Hector Vicente; Javier Ereña; Andres T. Aguayo; Javier Bilbao. 2021. "Experimental implementation of a catalytic membrane reactor for the direct synthesis of DME from H2+CO/CO2." Chemical Engineering Science 234, no. : 116396.
A model for simulating the direct synthesis of dimethyl ether (DME) in a packed bed membrane reactor (PBMR) has been validated, using a LTA zeolite hydrophilic membrane in a lab-scale reaction equipment. In the model, membrane permeability data and the kinetic model corresponding to a CuO-ZnO-ZrO2/SAPO-11 catalyst have been used. Experimental runs have been carried out under the following conditions: 275-325 °C; 20-40 bar; space time, 10 g h (molC)-1; CO2/COx ratio, 0, 0.5 and 1; H2/COx ratio, 3. The model is suitable for predicting the molar fractions of the compounds of the reaction medium (H2, CO, CO2, H2O, DME, methanol and hydrocarbons) in the reaction and permeate sections of the PBMR, and their evolution with time on stream. DME yield, CO and CO2 conversions are greater in the PBMR than without using the membrane, due to the displacement of the thermodynamic equilibrium by the partial separation of H2O from the reaction medium. For H2+CO feeds, the maximum DME yield is 68% at 325 °C and 40 bar with a space time value of 10 g h (molC)-1. Otherwise, feeding H2+CO2, CO2 conversion reaches 17%, with a DME yield over 5 %.
Ainara Ateka; Pablo Rodriguez-Vega; Tomás Cordero-Lanzac; Javier Bilbao; Andrés T. Aguayo. Model validation of a packed bed LTA membrane reactor for the direct synthesis of DME from CO/CO2. Chemical Engineering Journal 2020, 408, 127356 .
AMA StyleAinara Ateka, Pablo Rodriguez-Vega, Tomás Cordero-Lanzac, Javier Bilbao, Andrés T. Aguayo. Model validation of a packed bed LTA membrane reactor for the direct synthesis of DME from CO/CO2. Chemical Engineering Journal. 2020; 408 ():127356.
Chicago/Turabian StyleAinara Ateka; Pablo Rodriguez-Vega; Tomás Cordero-Lanzac; Javier Bilbao; Andrés T. Aguayo. 2020. "Model validation of a packed bed LTA membrane reactor for the direct synthesis of DME from CO/CO2." Chemical Engineering Journal 408, no. : 127356.
Gero eta arreta handiagoa eskaintzen ari zaio erregai fosilen errekuntzatik sortutako klima- aldaketari. karbono dioxidoa (CO2) berotegi-efektuaren eragile diren gasen artean ugariena da, eta klima-aldaketa arintzeko ezinbestekoa da haren isurketak murriztea. Helburu hori betetzeko, CCU teknologia (karbono dioxidoaren bahiketa eta erabilera) lagungarria izan daiteke. Horretan, lehenengo urratsa energia-plantetan edo industrietan sortzen den CO2-a bahitzea da, atmosferara isuri aurretik. ondoren, industrialki erabiliko duten instalazioetaraino garraiatzen da, eta horietan produktu komertzial bilakatzen da. CO2-a zuzenean erabil daiteke, eraldatu gabe, zenbait aplikaziotarako: uren gatzgabetzea, gainazalen garbiketa, elikagaien eta edarien ekoizpena eta petrolio- eta gas-hobien ustiatze-etekina hobetzeko. Bigarren aukera CO2-a lehengai modura erabiltzea da, produktu kimikoak zein erregaiak lortzeko. CCU teknologien abantaila nagusia CO2-aren erabilera jarduera errentagarria bihurtzea da, hondakinetatik abiatuz lortutako produktuak sal daitezkeelako. Hala ere, zenbait arazo daude CCU teknologiari lotuta: (i) produktu kimikoen eskaria ez da nahikoa CO2-aren kantitate esanguratsua bahitzeko, (ii) CO2-a erregaiak ekoizteko erabiltzen bada, isurketak atzeratu egiten dira, saihestu beharrean, (iii) zenbait produktu kimikotan egindako CO2-aren «biltegiratzeak» bizitza laburra izan dezake.
Ainara Ateka; Ander Portillo; Irene Sierra; Javier Ereña. CO2-aren erabilera, berotegi-efektua murrizteko estrategia. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria 2020, 257 -270.
AMA StyleAinara Ateka, Ander Portillo, Irene Sierra, Javier Ereña. CO2-aren erabilera, berotegi-efektua murrizteko estrategia. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria. 2020; (37):257-270.
Chicago/Turabian StyleAinara Ateka; Ander Portillo; Irene Sierra; Javier Ereña. 2020. "CO2-aren erabilera, berotegi-efektua murrizteko estrategia." EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria , no. 37: 257-270.
A kinetic model for the CO2 + CO hydrogenation to dimethyl ether (DME) in a single step over an original core-shell structured [email protected] bifunctional catalyst (metallic in the core and acid in shell) has been established. The catalytic runs have been carried out in an isothermal fixed bed reactor under the following conditions: 250–325 °C; 10–50 bar; space time, 1.25–15 gcat·h·molC−1; H2/COx molar fraction in the feed, 2.5–4, and CO2/COx, 0–1. The catalyst has a high activity and stability as a result of the separation of the reactions in the two functions. The model describes the effect of the operating conditions (temperature, pressure and feed composition) over the evolution of product distribution with time on stream. For this, the individual reactions (CO2 and CO hydrogenation to methanol, its dehydration to DME, the WGS reaction and the side reaction of hydrocarbons formation) are considered together with catalyst deactivation. Using the model, simulation studies allow for establishing suitable operating conditions (305 °C, 70 bar, CO2/COx of 0.75 and H2/COx of 3) to attain a good compromise between DME yield and CO2 conversion, reaching a value of 23% for both objectives.
Ainara Ateka; Miguel Sánchez-Contador; Ander Portillo; Javier Bilbao; Andres T. Aguayo. Kinetic modeling of CO2+CO hydrogenation to DME over a [email protected] core-shell catalyst. Fuel Processing Technology 2020, 206, 106434 .
AMA StyleAinara Ateka, Miguel Sánchez-Contador, Ander Portillo, Javier Bilbao, Andres T. Aguayo. Kinetic modeling of CO2+CO hydrogenation to DME over a [email protected] core-shell catalyst. Fuel Processing Technology. 2020; 206 ():106434.
Chicago/Turabian StyleAinara Ateka; Miguel Sánchez-Contador; Ander Portillo; Javier Bilbao; Andres T. Aguayo. 2020. "Kinetic modeling of CO2+CO hydrogenation to DME over a [email protected] core-shell catalyst." Fuel Processing Technology 206, no. : 106434.
Ainara Ateka; Ander Portillo; Miguel Sanchez-Contador; Javier Bilbao; Andrés T. Aguayo. Core-shell catalysts for the direct synthesis of DME. Kinetic modeling. 14th Mediterranean Congress of Chemical Engineering (MeCCE14) Abstracts Publication 2020, 1 .
AMA StyleAinara Ateka, Ander Portillo, Miguel Sanchez-Contador, Javier Bilbao, Andrés T. Aguayo. Core-shell catalysts for the direct synthesis of DME. Kinetic modeling. 14th Mediterranean Congress of Chemical Engineering (MeCCE14) Abstracts Publication. 2020; ():1.
Chicago/Turabian StyleAinara Ateka; Ander Portillo; Miguel Sanchez-Contador; Javier Bilbao; Andrés T. Aguayo. 2020. "Core-shell catalysts for the direct synthesis of DME. Kinetic modeling." 14th Mediterranean Congress of Chemical Engineering (MeCCE14) Abstracts Publication , no. : 1.
The intensification of CO2 valorization has been theoretically studied in the direct synthesis of dimethyl ether (DME) carried out in a packed-bed reactor by means of two strategies pursuing the attenuation of the thermodynamic limitations of the process. Thus, the recycling of the non-converted reactants, and the use of H2O perm-selective membranes, with different sweeping strategies has been studied. Special attention has been paid on improving the yield of DME and the conversion of CO2, seeking for a good balance between both objectives. The study has been conducted using the kinetic model previously established for a CuO-ZnO-MnO/SAPO-18 catalyst. Quantifying the deactivation kinetics in the kinetic model has allowed to ascertain that both strategies contribute to attenuating deactivation. With a recirculation factor of 0.97, for a CO2/COx ratio in the feed of 0.25, at 275 ºC and 30 bar, a CO2 conversion of 70 % and a DME yield of 60 % are achieved. Using in the simulation a membrane with a H2O permeability of 1•10-7 mol s-1 m2 Pa-1 and a H2O/H2 selectivity of 4, feasible with H-SOD type zeolite membranes, increases CO2 conversion up to 3.5-5 % with regard to that obtained in a packed-bed reactor, and outstands the upgrade in DME yield, reaching an improvement of 25 % for the hydrogenation of pure CO2, regardless the sweeping strategy used (parallel or counter-current mode, or using pure H2 or H2+CO+CO2).
Ainara Ateka; Javier Ereña; Javier Bilbao; Andres Tomas Aguayo. Strategies for the Intensification of CO2 Valorization in the One-Step Dimethyl Ether Synthesis Process. Industrial & Engineering Chemistry Research 2019, 59, 713 -722.
AMA StyleAinara Ateka, Javier Ereña, Javier Bilbao, Andres Tomas Aguayo. Strategies for the Intensification of CO2 Valorization in the One-Step Dimethyl Ether Synthesis Process. Industrial & Engineering Chemistry Research. 2019; 59 (2):713-722.
Chicago/Turabian StyleAinara Ateka; Javier Ereña; Javier Bilbao; Andres Tomas Aguayo. 2019. "Strategies for the Intensification of CO2 Valorization in the One-Step Dimethyl Ether Synthesis Process." Industrial & Engineering Chemistry Research 59, no. 2: 713-722.
The behavior of the [email protected] core-shell catalyst in the direct synthesis of DME from H2+CO + CO2 mixtures has been assessed. The effect of the reaction conditions (temperature, pressure, space-time) and feed composition (CO2 and H2 concentration) on the DME yield and selectivity, CO2 and COx (CO2+CO) conversions and stability of the catalyst have been studied. The experiments have been carried out in a fixed-bed reactor in the following condition ranges: 250–325 °C; 10–50 bar; space-time, 1.25–15 g h molC−1; CO2/COx molar ratio in the feed, 0–1; and H2/COx molar ratio in the feed, 2.5–4; time on stream, up to 48 h. Under mild conditions (275–300 °C range, 20–30 bar, space-time over 5 g h molC−1, CO2/COx molar ratio in the 0.5–0.75 range, and H2/COx molar ratio around 3) a good compromise is reached between the yield of DME and the conversion of CO2, with high catalyst stability. Coke deposition is the main cause of catalyst deactivation, formed by condensation of the hydrocarbon byproducts, blocking the metallic sites in the core. The formation rate of this fraction of coke is greater than that of the coke deposited in the SAPO-11 of the shell. Increasing reaction temperature favors the formation of coke, while co-feeding CO2 attenuates this formation, due to the increase of H2O concentration.
M. Sánchez-Contador; A. Ateka; M. Ibáñez; J. Bilbao; A.T. Aguayo. Influence of the operating conditions on the behavior and deactivation of a [email protected] core-shell-like catalyst in the direct synthesis of DME. Renewable Energy 2019, 138, 585 -597.
AMA StyleM. Sánchez-Contador, A. Ateka, M. Ibáñez, J. Bilbao, A.T. Aguayo. Influence of the operating conditions on the behavior and deactivation of a [email protected] core-shell-like catalyst in the direct synthesis of DME. Renewable Energy. 2019; 138 ():585-597.
Chicago/Turabian StyleM. Sánchez-Contador; A. Ateka; M. Ibáñez; J. Bilbao; A.T. Aguayo. 2019. "Influence of the operating conditions on the behavior and deactivation of a [email protected] core-shell-like catalyst in the direct synthesis of DME." Renewable Energy 138, no. : 585-597.
A kinetic model has been established for the direct synthesis of dimethyl ether (DME) from syngas and CO2 feeds. The kinetic parameters have been determined fitting the experimental results obtained using a CuO‑ZnO‑MnO/SAPO‑18 (CZMn/S) bifunctional catalyst in a fixed‑bed isothermal reactor, under a wide range of operating conditions: 250–350 °C; 10–40 bar; CO2/CO molar ratio in the feed, between 0 and 1; H2/COX molar ratio in the feed, 3/1 and 4/1; space time, from 1.25 gcath(molC)−1, up to 20 gcath(molC)−1; time on stream, up to 30 h. The model considers the kinetic equations of the individual reactions of methanol synthesis from CO and CO2, the dehydration of methanol to DME, the water gas shift reaction (WGS) and the formation of paraffins, along with the deactivation kinetics. The attenuation of the reaction rates of methanol and paraffins synthesis has been considered by the competitive adsorption of CO2 and H2O in the metallic sites with respect to the adsorption of CO (more reactive than CO2 in the synthesis of methanol). The deactivation by coke has been quantified by a kinetic equation dependent on the concentrations of methanol and DME, and the attenuation of the deactivation by the competitive adsorption of CO2 and H2O has also been considered in this equation. The kinetic model allows predicting satisfactorily the evolution with time on stream of the concentration of the components in the reaction medium (methanol, DME, unreacted CO and CO2, and paraffins formed as by‑products). In addition, the model has been used to simulate the reactor, determining the effect of the reaction conditions on the conversion of CO2. This conversion, in contrast to the yield of DME, increases with increasing CO2 concentration in the reactor feed.
Ainara Ateka; Javier Ereña; Javier Bilbao; Andrés T. Aguayo. Kinetic modeling of the direct synthesis of dimethyl ether over a CuO‑ZnO‑MnO/SAPO‑18 catalyst and assessment of the CO2 conversion. Fuel Processing Technology 2018, 181, 233 -243.
AMA StyleAinara Ateka, Javier Ereña, Javier Bilbao, Andrés T. Aguayo. Kinetic modeling of the direct synthesis of dimethyl ether over a CuO‑ZnO‑MnO/SAPO‑18 catalyst and assessment of the CO2 conversion. Fuel Processing Technology. 2018; 181 ():233-243.
Chicago/Turabian StyleAinara Ateka; Javier Ereña; Javier Bilbao; Andrés T. Aguayo. 2018. "Kinetic modeling of the direct synthesis of dimethyl ether over a CuO‑ZnO‑MnO/SAPO‑18 catalyst and assessment of the CO2 conversion." Fuel Processing Technology 181, no. : 233-243.
The impact of different process variables affecting the coking and rejuvenation of HZSM-5 zeolite catalyst has been studied during the conversion of dimethyl ether (DME) to olefins in a fixed bed reactor. Those variables involve the effect of (i) the matrix material with mesopores; (ii) temperature; (iii) space time; (iv) acidity of the catalyst; (v) steam, inert or air in the reaction-regeneration medium. Used catalysts have been characterized through N2 adsorption-desorption and temperature-programmed oxidation and the presence of three coke fractions has been identified deposited within the zeolite micropores, the external surface of the crystals and the mesopores of the matrix. Low Si/Al ratios (140) and temperatures (350 ºC), and co-feeding water with DME, reduce the formation of coke within the zeolite micropores, favoring the stability of the catalyst. Reaction-regeneration cycles confirm that catalysts totally recover the activity through combustion of coke during a heating ramp up to 550 ºC.
Tomás Cordero-Lanzac; Ainara Ateka; Paula Pérez-Uriarte; Pedro Castaño; Andres Tomas Aguayo; Javier Bilbao. Insight into the Deactivation and Regeneration of HZSM-5 Zeolite Catalysts in the Conversion of Dimethyl Ether to Olefins. Industrial & Engineering Chemistry Research 2018, 57, 13689 -13702.
AMA StyleTomás Cordero-Lanzac, Ainara Ateka, Paula Pérez-Uriarte, Pedro Castaño, Andres Tomas Aguayo, Javier Bilbao. Insight into the Deactivation and Regeneration of HZSM-5 Zeolite Catalysts in the Conversion of Dimethyl Ether to Olefins. Industrial & Engineering Chemistry Research. 2018; 57 (41):13689-13702.
Chicago/Turabian StyleTomás Cordero-Lanzac; Ainara Ateka; Paula Pérez-Uriarte; Pedro Castaño; Andres Tomas Aguayo; Javier Bilbao. 2018. "Insight into the Deactivation and Regeneration of HZSM-5 Zeolite Catalysts in the Conversion of Dimethyl Ether to Olefins." Industrial & Engineering Chemistry Research 57, no. 41: 13689-13702.
The preparation by physical coating of a bifunctional core-shell-structured catalyst ([email protected]), using CuO-ZnO-ZrO2 (CZZr) as metallic function and SAPO-11 (S-11) as acid function, has been studied. The effects of calcination temperature and mass ratio between the metallic and acid functions (M/A) on their kinetic behavior for the synthesis of DME from syngas and CO2 feeds has been assessed. The reaction indices considered have been: the conversion of COx (CO + CO2) and CO2; yields and selectivities of dimethyl ether (DME), methanol and hydrocarbons; and stability. The experiments have been carried out in a fixed-bed reactor (275 °C, 30 bar). The [email protected] catalyst prepared under suitable conditions (calcination at 400 °C and M/A of 1/2), shows better reaction indices than the hybrid catalyst (CZZr/S-11), prepared by physical mixture of the individual functions, which is explained by the advantages of the core-shell structure, especially interesting for the valorization of CO2.
M. Sánchez-Contador; A. Ateka; A.T. Aguayo; J. Bilbao. Direct synthesis of dimethyl ether from CO and CO2 over a core-shell structured [email protected] catalyst. Fuel Processing Technology 2018, 179, 258 -268.
AMA StyleM. Sánchez-Contador, A. Ateka, A.T. Aguayo, J. Bilbao. Direct synthesis of dimethyl ether from CO and CO2 over a core-shell structured [email protected] catalyst. Fuel Processing Technology. 2018; 179 ():258-268.
Chicago/Turabian StyleM. Sánchez-Contador; A. Ateka; A.T. Aguayo; J. Bilbao. 2018. "Direct synthesis of dimethyl ether from CO and CO2 over a core-shell structured [email protected] catalyst." Fuel Processing Technology 179, no. : 258-268.
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%).
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 StyleM. 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 StyleM. 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.
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.
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 StyleAinara 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 StyleAinara 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.
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.
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 StyleAinara 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 StyleAinara 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.
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.
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 StyleMiguel 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 StyleMiguel 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.
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 StyleAinara 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 StyleAinara 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.
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 StylePaula 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 StylePaula 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.
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 StyleAinara 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 StyleAinara 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.
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 StyleAinara 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 StyleAinara 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.
Gero eta arreta gehiago eskaintzen ari zaio klima-aldaketari. Gizakion jardueraren eraginez Lurraren tenperatura igotzen ari da. Berotegi-efektuko gasen artean karbono dioxidoa (CO2) ugariena da, eta energia-iturri fosilen errekuntzan du jato- rri antropogeniko nagusia. CO2-ak denbora luzez irauten du atmosferan, eta ondorioz, beharrezkoa da haren isurketak murriztea. Helburu hori betetzeko, karbono dioxidoaren bahiketa- eta biltegiratze-teknologia (CCS teknologia) erabil daiteke. Horretan, lehenengo pausoa, ekoitzitako CO2-a bahitzea da, atmosferara isuri aurretik. Ondoren, garraiatu eta formazio geologikoetan (akuifero gazi sakonetan, edota petrolio- edo gas-gordailuetan) biltegiratzen da. CCS teknologiak erregai fosilen erabilera jarraitua ahalbidetzen du, CO2-aren atmosferarako isurketak murrizten dituen bitartean. Hala ere, baditu zenbait arazo, hala nola, inbertsio ekonomiko eta energia-beharrizan handiak, epe luzerako biltegiratzea iraunkorra dela egiaztatu beharra, biztanleriaren erresistentzia, eta biltegiratzeko lekuen falta herrialde batzuetan.
Ainara Ateka; Irene Sierra; Javier Ereña. CO2-ren bahiketa, klima-aldaketa arintzeko estrategia. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria 2016, 81 -92.
AMA StyleAinara Ateka, Irene Sierra, Javier Ereña. CO2-ren bahiketa, klima-aldaketa arintzeko estrategia. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria. 2016; (30):81-92.
Chicago/Turabian StyleAinara Ateka; Irene Sierra; Javier Ereña. 2016. "CO2-ren bahiketa, klima-aldaketa arintzeko estrategia." EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria , no. 30: 81-92.