Stability and activity of a co-precipitated Mg promoted Ni/Al2O3 catalyst for supercritical water gasification of biomass |
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| Affiliation: | 1. School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;1. School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China;2. Collaborative Innovation Center of Western Typical Industry Environmental Pollution Control, Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;3. Pacific Northwest National Laboratory, Richland, WA 99352, United States;1. Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi Province 710049, China;2. Jiangsu Provincial Academy of Environmental Science, Jiangsu Province Key Laboratory of Environmental Engineering, Nanjing, Jiangsu, 210036, China;3. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, Shanxi Province, 710049, PR China;1. Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China;2. Xi’an Jiaotong University Suzhou Academy, Suzhou, Jiangsu, 215123, China |
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| Abstract: | We have investigated the stability and activity of a co-precipitated Mg promoted Ni/Al2O3 catalyst (Ni-Mg-Al) for supercritical water gasification (SCWG) of various biomass model compounds and real biomass. Phase stability and activity recovery of the Ni-Mg-Al catalyst were first compared with a catalyst prepared by impregnation method. It was found that the co-participated catalyst showed higher activity recoveries than the impregnated catalyst due to the stable Ni crystal size. Then, effects of SCWG variables including heating up rate, gasification temperature, catalyst loading amount and feedstock concentration, on the non-catalytic and catalytic gas yields and gasification efficiencies of glucose and phenol were evaluated. Results demonstrated that the presence of sufficient amount of Ni catalyst could realize complete carbon gasification of different organics, including phenol and real biomass. Catalyzed by Ni, CH4 was the more favored produced gas at 400–500 °C while H2 yields were more abundant at 500–600 °C. Without catalyst, carbon gasification efficiencies of SCWG of different feedstock were in the order: glycerol > glucose > cellulose ≈ corncob ≈ poplar leaf ≈ sawdust > phenol, while those catalyzed by Ni were in the order: glycerol ≈ glucose ≈ cellulose ≈ phenol > corncob ≈ poplar leaf ≈ sawdust, illustrating that the co-precipitated Ni MgAl catalyst is more active on catalyzing the gasification of water-soluble organics than real biomass. |
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| Keywords: | Supercritical water gasification Nickel catalyst Hydrogen production Phenol Biomass |
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