The influence of nickel content on the performance of hydrotalcite-derived catalysts in CO2 methanation reaction |
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| Authors: | Dominik Wierzbicki Rafał Baran Radosław Dębek Monika Motak Teresa Grzybek Maria Elena Gálvez Patrick Da Costa |
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| Affiliation: | 1. AGH University of Science and Technology, Faculty of Energy and Fuels, Al. A. Mickiewicza 30, 30-059, Cracow, Poland;2. ESRF – European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble, France;3. Sorbonne Universités, UPMC, Univ. Paris 6, CNRS, UMR 7190, Institut Jean Le Rond d’Alembert, 2 place de la gare de ceinture, 78210, Saint-Cyr-L’Ecole, France |
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| Abstract: | A series of mixed oxides obtained by thermal decomposition of hydrotalcites containing different amounts of Ni and constant MII+/MIII+ molar ratio were characterized by XRD, XANES, XES, H2-TPR, CO2-TPD, elemental analysis and low temperature nitrogen sorption technique. The results confirm the formation of periclase-like structured materials after thermal treatment, with nickel present as NiO in octahedral coordination environment. As proven by H2-TPR with increasing Ni content the interaction between Ni and hydrotalcite matrix weakens, which has a positive influence on the catalytic performance. The catalysts containing different amounts of nickel (10.3, 16.2, 27.3, 36.8, 42.5 wt.%) showed at 300 °C a very good catalytic performance in carbon dioxide methanation, with CO2 conversion of 36 (Ni10.3)–82% (Ni42.5) and CH4 selectivity of 98–99%. |
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| Keywords: | Methanation Nickel content Hydrotalcite |
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