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| Preparation of Ni-based catalysts and evaluation of their catalytic activity in gasification of municipal solid waste (MSW) to hydrogen. |
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Abstract Ni-based catalysts were prepared with ceramsite as carrier by the method of impregnation, and characterized using X-ray diffraction(XRD), X-ray fluorescence (XRF), BET, environmental scanning electronic microscope-energy dispersive X-ray (ESEM-EDX) and elemental analysis. Ni-based catalysts have a specific surface area of 101.3m2/g. The active components of catalysts were spherical NiO particles coated on the surface of supports in a mean size range of about 2μm. Furthermore, evaluation of catalytic activity of the Ni-based catalysts used in MSW steam gasification was also investigated in a bench-scale downstream fixed bed reactor. The experiments demonstrated that in the presence of Ni based catalysts H2 and CO contents significantly increased, while CO2, CH4, C2H4 and C2H6 contents decreased. H2 yield in catalytic gasification process was greater than that in gasification process at lower temperature, the potential H2 yield for catalytic gasification process was greater than that in gasification process, but less at higher temperature. Higher temperature favored formation of H2 and CO, and decomposition of CH4, C2H4 and C2H6. Meanwhile, tar yield and char yield for catalytic gasification process were significantly less than for gasification process, but gas yield was greater under the same conditions.
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Received: 04 September 2008
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