Steam reforming of acetic acid over NiKOH/Al2O3 catalyst with low nickel loading: The remarkable promotional effects of KOH on activity |
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| Affiliation: | 1. School of Material Science and Engineering, University of Jinan, Jinan, 250022, PR China;2. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China;3. Key Laboratory of Low Carbon Energy and Chemical Engineering, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China;4. Center for Green Innovation, Beijing Key Laboratory for Magneto–Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, PR China;1. School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China;2. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, PR China;3. Key Laboratory of Low Carbon Energy and Chemical Engineering, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, PR China;4. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shaanxi Key Laboratory of Chemical Reaction Engineering, Department of Chemistry and Chemical Engineering, Yan′an University, China;3. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;4. School of Energy and Power Engineering, Jiangsu University, Jiangsu 212013, China;1. School of Science, Tibet University, No. 36 Jiangsu Street, Lhasa 850012, Tibet Autonomous Region, China;2. School of Environmental Science and Engineering/China-Australia Centre for Sustainable Urban Development, Tianjin University, Tianjin 300072, China;3. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China;1. School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China;2. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, PR China;3. Key Laboratory of Low Carbon Energy and Chemical Engineering, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China;1. School of Material Science and Engineering, University of Jinan, Jinan, 250022, PR China;2. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China;3. Collaborative Innovation Center of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, 210044, Nanjing, China;4. Key Laboratory of Low Carbon Energy and Chemical Engineering, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;5. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, PR China;1. School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China;2. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China;3. Key Laboratory of Low Carbon Energy and Chemical Engineering, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China |
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| Abstract: | In this paper, the effects of strong base (KOH) addition on the catalytic performances of Ni/Al2O3 catalysts in acetic acid steam reforming for hydrogen generation was investigated. The addition of KOH drastically changed the physiochemical property and catalytic performances of the nickel–based catalysts. KOH reacted with γ–Al2O3 during calcination, forming ɑ–Al2O3 with Al(OH)3 as a reaction intermediate, which led to reconstruction of the porous structure, merge of small pores, decreased specific area and sintering of nickel. Most importantly, the catalytic activity of nickel–based catalysts were significantly enhanced by the addition KOH, especially the ones with low nickel loading. There are almost no active of 1 wt% Ni/Al2O3 catalyst for steam reforming of acetic acid, while, with adding 5 wt % KOH, activity of the catalyst matched that of 20 wt% Ni/Al2O3. In–situ DRIFTS study showed the involvement of the reactive intermediates including CH3, CH2, C O, COO, C OC, CC and absorbed CO2 in acetic acid steam reforming. The Ni/Al2O3 catalyst with low nickel loading had insufficient metallic nickel to gasify these reactive intermediates. The presence KOH effectively aided gasification of the reactive intermediates, and thus significantly promoted the catalytic activity. In addition, the KOH with varied loading significantly affect formation of catalytic coke and polymeric coke formed during the reforming reaction. |
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| Keywords: | Steam reforming Promotional effects of KOH on activity In–situ DRIFTS study Coke properties |
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