Catalytic performances of Ni-based catalysts on supercritical water gasification of phenol solution and coal-gasification wastewater |
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| Affiliation: | 1. Xi''an University of Technology, NO.5 South Jinhua Road, Xi''an, Shaanxi, 710048, PR China;2. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi''an Jiaotong University, No.28, Xianning West Road, Xi''an, Shaanxi, 710049, PR China;3. Jinneng Group Co., Ltd., No.82 Kaihuasi Street, Taiyuan, Shanxi, 030002, PR China;1. Clean Energy Research Laboratory, Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada;2. Department of Chemical Engineering, Gebze Technical University Gebze 41400 Kocaeli, Turkey;3. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, 240 Prince Phillip Drive St. John''s, Newfoundland and Labrador A1B 3X5, Canada;1. Chemical Engineering Department, University of Usak, Usak, Turkey;2. Chemical Engineering Department, Ege University, İzmir, Turkey;1. School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;2. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109-2136, United States;3. Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, United States;4. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China |
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| Abstract: | Activity and stability of the supported Ni-based catalysts for the gasification performances of phenol solution and coal-gasification wastewater in supercritical water were studied in a continuous reactor at 480 °C, 25 MPa and oxygen ratio of 0.2 for 50 h operation. The influences of the supports (γ-Al2O3, active carbon (AC) and carbon nanotube (CNT)) on gas yields, gasification efficiencies for phenol solution were investigated, and the loading amount of Ni were optimized. Results showed that the catalytic activity and the stability of the catalysts followed the order of Ni/CNT > Ni/AC > Ni/γ-Al2O3. The activity of Ni/AC and Ni/γ-Al2O3 decreased after 30 h continuous operation, and there occurred significant leaching of Ni2+. For Ni/CNT catalyst, H2 yield increased obviously when the loading amount of Ni lower than 15 wt%, while increased little at higher loading amount. Then, 15 wt% Ni/CNT with a thickness of 1.5 mm was coated on 316 L stainless steel (SS316L, an economic material usually used as the reactor material), which can act as a "catalytic tube wall" in reactor. The catalytic activity and corrosion resistance of Ni/CNT/SS316L for the gasification of real coal-gasification wastewater were studied. Results showed that Ni/CNT/SS316L gave a great positive effect on H2 production. H2 yield increased from 25.36 mmol/g (total organic carbon) without catalyst to 75.12 mmol/g (total organic carbon) with Ni/CNT/SS316L after operated for 20 h, respectively. However, obvious pealing of the coating was found after 50 h operation. Further study is necessary for the improvement of the coating preparation method. |
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| Keywords: | Catalyst Ni Supercritical water gasification Coal-gasification wastewater Phenol |
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