Sorption enhanced steam reforming of ethanol for hydrogen production,over Mg/Al hydrotalcites modified with K |
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| Affiliation: | 1. Laboratorio de Proceso Catalíticos, Instituto de Tecnologías Del Hidrógeno y Energías Sostenibles (ITHES), UBA-CONICET, Facultad de Ingeniería, Pabellón de Industrias, Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, 1428, Argentina;2. Instituto en Catálisis y Petroquímica “Ing, Jose Miguel Parera” (INCAPE) Centro Científico Tecnológico CONICET, Santa Fe (CCT-Sant Fe), Santa Fe, Argentina;1. School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China;2. Graduate School, Liaoning Petrochemical University, Fushun 113001, Liaoning, China;3. Shanxi Normal University, Taiyuan 030000, Shanxi, China;1. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;2. Institute of New Energy and Energy-Saving & Emission-Reduction Technology, Hunan University, Changsha 410082, China;1. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facility Materials, Department of Materials Science and Engineering, China University of Petroleum (Beijing), Beijing 102249, China;2. Key Laboratory of Energy Transfer and System of Power Station of Ministry of Education, North China Electric Power University, Beijing 102206, China;3. China Special Equipment Inspection and Research Institute, Beijing 100029, China;1. Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy;2. Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, Via G. Campi 213/A, 41125 Modena, Italy;3. Dipartimento di Ingegneria “Enzo Ferrari”, Università di Modena e Reggio Emilia, Via Vivarelli 10, 41125 Modena, Italy;4. CNR - Istituto Nanoscienze - Centro S3, Via Campi 213/A, 41125 Modena, Italy;5. Centro H2–MORE, Università di Modena e Reggio Emilia, 41125 Modena, Italy |
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| Abstract: | Sorption-enhanced ethanol steam reforming is an interesting alternative, to produce high purity H2. In this study, potassium promoted hydrotalcites are compared for sorption-enhanced ethanol steam reforming reaction under cyclic operation, performing sorbent regeneration at reaction temperature which is a great advantage to reduce process energy requirements. It is found that potassium promoted hydrotalcites have higher CO2 sorption capacity compared to unpromoted ones, due to the higher concentration of intermediate and strong basic sites. The hydrotalcite modified with 15 wt% potassium shows the best performance on multicyclic CO2 sorption-desorption (sorption capacity = 0.167 molCO2/kgsorbent). Therefore, there is an optimum loading of potassium, for which the opposite effects of reduction in surface area and enhanced basicity are balanced. Finally, potassium promoted hydrotalcites are tested under cyclical ethanol reforming process with simultaneous adsorption of CO2 followed by regeneration in N2 at reaction temperature (500 °C). At short reaction times (<5 min), H2 purities higher than 95% are achieved, with CO2 purities near 0%. |
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| Keywords: | Hydrogen production: K-Promoted Mg/al hydrotalcites Sorption enhanced ethanol steam reforming |
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