Steam reforming of CH4 at low temperature on Ni/ZrO2 catalyst: Effect of H2O/CH4 ratio on carbon deposition |
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| Affiliation: | 1. Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610065, PR China;2. College of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, PR China;1. Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran;2. Department of Chemical Engineering, Tafresh University, Tafresh, Iran;1. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;2. Faculty of Metallurgy and Materials Engineering, Semnan University, Semnan, Iran;3. Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran;4. Department of Environmental Engineering, Gebze Technical University, 41400 Gebze, Turkey;5. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam;6. Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran |
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| Abstract: | In present work, the H2O/CH4 on carbon deposition in SRM reaction over Ni/ZrO2 was studied. Prepared by impregnation, the catalysts were characterized by TEM, XPS, H2-TPR, TG-DSC-MS, Raman, and XRD. The results showed that when H2O/CH4 = 2 with GHSV of 14460 h−1, the highest CH4 conversion (46.8%) was achieved on the Ni/ZrO2 catalyst at 550 °C. This was due to the relatively high surface content of Ni0 (27%) species and the formation of easy removal polymer carbon (C1). When the H2O/CH4 was 1, a large amount of difficult to remove fiber carbon (C2) formed and polymer carbon would wrap around the catalyst to reduce its activity. However, excess water might promote surface reconstruction by converting Ni0 to Ni(OH)2, which reduced the surface Ni0 content and then inhibited the catalytic activity, while the amount of carbon deposited, especially C2, reduced significantly. |
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| Keywords: | Methane steam reforming Carbon deposition Nickel Zirconia Low temperature |
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