Effect of hydroxyl and Mo doping on activity and carbon deposition resistance of hydroxyapatite supported NixMoy catalyst for syngas production via DRM reaction |
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| Affiliation: | 1. Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China;2. Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, China;3. Environmental and Renewable Energy Systems, Gifu University, Gifu 501-1193, Japan;4. Zhenjiang Institute for Innovation and Development, Nanjing Normal University, Zhenjiang 212050, China;1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Multi-discipline Research Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;4. Northwest Institute for Nonferrous Metal Research, Shaanxi Key Laboratory of Biomedical Metal Materials, Xi''an 710016, China;1. National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huaian 223003, China;2. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;1. Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Al-Farabi 71, Almaty 050038, Kazakhstan;2. Department of Chemical and Biochemical Engineering, Institute of Geology and Oil-Gas Business Institute Named after K. Turyssov, Satbayev University, Almaty 050043, Kazakhstan;3. Department of Property Protection and Security, ?alpazar? Vocational School, Trabzon University, 61670, Trabzon, Turkey;4. Department of Biology, Karadeniz Technical University, 61080, Trabzon, Turkey;5. Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;6. K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow 127276, Russia;7. Faculty of Engineering and Natural Sciences, Bahcesehir University, Istanbul, 34353, Turkey;1. Institute of Engineering Innovation, School of Engineering the University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan;2. Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan;3. Department of Systems and Control Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan;4. Department of Mechanical Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, 152-8550 Tokyo, Japan;1. Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, 130022, China;2. College of Bionics Science and Engineering, Jilin University, Changchun, 130022, China |
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| Abstract: | The doping of the second metal Mo is expected to further enhance the carbon deposition resistance of Ni-based catalysts for syngas production via dry reforming of methane (DRM). In this study, the hydroxyapatite (HAP) was used as the support and a small Mo dosage was doped in the Ni-based catalysts to investigate the effect of intrinsic hydroxyl and Mo doping on the catalytic activity and carbon deposition resistance in DRM reaction. The catalyst characterization results show that both Ni and Mo are doped into the HAP structure with relatively uniform dispersion. The basic site strength of Ni4Mo0.2-HAP catalyst containing Mo is significantly higher than that of without Mo. The Mo dopant significantly improves the initial catalytic activity, but has minimal effect on the stability enhancement. Whether the catalyst is pre-reduced or not is crucial to the initial activity of the DRM reaction, the non-pre-reduced catalysts will go through a “self-activation” stage at the beginning of the reaction, where the “hydroxyl group” are proved to play as an “oxygen supply” for the partial oxidation of CH4 or the oxidation of the carbon deposition in the initial stage. Only trace amount of carbon deposition is found after 100 h of DRM reaction on Ni3Mo0.2-HAP catalyst. The NiMo-HAP catalysts exhibit excellent initial activity and resistance to carbon deposition due to the synergistic effect of Ni–Mo alloy and hydroxyl groups in the hydroxyapatite support. |
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| Keywords: | Mo doped Hydroxyl Ni-based catalysts Hydroxyapatite dry reforming of methane Carbon deposition resistance |
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