Metallic Ni nanocatalyst in situ formed from LaNi5H5 toward efficient CO2 methanation |
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| Affiliation: | 1. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, People''s Republic of China;2. School of Natural Sciences and Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan, QLD 4111, Australia;3. China-Australia Joint Laboratory for Energy & Environmental Materials, Joint Venture of Griffith University and South China University of Technology, Nathan, QLD 4111, Australia;1. Kazakhstan-Britain Technical University, Almaty, Kazakhstan;2. Tomsk Polytechnic University, Tomsk, Russia;3. Innovation and Development Agency, Almaty, Kazakhstan;1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;1. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Russia;2. Tomsk Polytechnic University, Russia;1. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang, 621907, China;2. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621900, China;3. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, 402160, China;1. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, People’s Republic of China;2. China-Australia Joint Laboratory for Energy & Environmental Materials, Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510641, People’s Republic of China;3. Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, Macau SAR, People’s Republic of China |
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| Abstract: | LaNi5 alloy can be utilized to directly store and release hydrogen in mild condition, thus it is considered as a long-term safe and stable solid-state hydrogen storage material. In this work, LaNi5H5 was used as the solid-state hydrogen source in the CO2 methanation reaction. Impressively, the carbon dioxide conversion can be achieved to nearly 100% under 3 MPa mixed gas at 200 °C. The microstructure and composition analysis results reveal that the high catalytic activity may originate from the promoted elementary steps over in situ formed metallic Ni nanoparticles during the CO2 methanation process. More importantly, as the lowered reaction temperature prevented the agglomeration of Ni nanoparticles, this catalyst exhibited durable stability with 99% conversion rate of CO2 retained after 400 h cycling test. |
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| Keywords: | Ni catalyst Metal hydride |
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