Investigation of Ba doping in A-site deficient perovskite Ni-exsolved catalysts for biogas dry reforming |
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| Affiliation: | 1. Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences» Leninsky Prospect, 33, Building 2, 119071, Moscow, Russian Federation;2. Federal Government Budgetary Institution of Science. “Federal Scientific Agroengeneering Centre VIM”, 1st Institutskiy Proezd, Building 5, 109428, Moscow, Russian Federation;3. Russian University of Transport, 127994, St. Obraztsova, 9, Bldg. 9, Moscow, Russia;1. Functional Materials and Components R&D Group, Korea Institute of Industrial Technology, Gangneung 25440, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea;3. Research & Development Team, Korea Zinc Company, Ulsan 44997, Republic of Korea;4. Department of Chemistry – Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden;1. College of Electrical Information, Changchun Guanghua University, Changchun, Jilin, 130033, China;2. College of Mechanical and Electrical Engineering, Changchun University of Technology, Changchun, Jilin, 130012, China;3. University of Tehran, Tehran, Iran;1. College of Materials Science and Engineering, Nanjing Tech University, Puzhu South Road No.30, 211816, Nanjing, Jiangsu, China;2. The Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Puzhu South Road No.30, 211816, Nanjing, Jiangsu, China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Puzhu South Road No.30, 211816, Nanjing, Jiangsu, China |
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| Abstract: | This work presents the development of an A-site deficient La0.9−xBaxAl0.85Ni0.15O3 (x = 0, 0.02, 0.04, and 0.06) perovskite oxide catalyst for dry reforming of model biogas. The catalysts are prepared using a citrate sol-gel method and used for biogas dry reforming at 800 °C for feed ratios (CH4/CO2) of 1.5 and 2.0. The fresh and spent catalysts are analyzed using XRD, FTIR, TPD, XPS, FESEM, TEM, TPR, TGA-DTA, and Raman analysis. The XRD analysis exhibits the host perovskite oxide structure and the exsolved Ni phase for all prepared catalysts. The partial doping of Ba improves the metal support interaction and oxygen vacancies that enhance catalytic activity and stability, as revealed by the TPR and XPS analysis. The stability experiment on La0.9−xBaxAl0.85Ni0.15O3, for x = 0 catalyst resulted in reduced activity due to the catalyst deactivation by sintering, as confirmed by XRD and FE-SEM. Among all the catalysts studied, La0.84Ba0.06Al0.85Ni0.15O3 (LB6AN-15) exhibited the highest catalytic stability with CH4, and CO2 conversions are 60% and 93%, respectively, for 40 h time-on-stream due to the strong metal support interactions, high oxygen vacancies, and anti-sintering of exsolved Ni nanoparticles in biogas dry reforming. |
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| Keywords: | Biogas Dry reforming Perovskites Metal support-Interaction Catalyst deactivation |
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