Abstract: Ni-based catalysts with magnesia-alumina spinel structural support are prepared via incipient wetness impregnation method,and then coated with silica through impregnation and hydrolysis of (3-aminopropyl) triethoxysilane with different contents to obtain silica coated Ni-based catalysts.La is added in the coated catalysts to improve the stability of silica layer.The effects of silica coating and La additive on the performance of the catalysts are compared.The catalysts are characterized by XRD,N2-physical adsorption,H2-TPR,TEM and TG.Experimental results show that silica coating layer can effectively prevent the formation of carbon on the surface of the catalyst at high temperature.Under the harsh conditions of 75℃ and n(H2O):n(CH4)=1.0,the carbon deposition rate of the 10%SiO2 coated catalyst with La additive is reduced by more than 90% compared with that of the uncoated catalyst.
高鑫华, 沈卫华, 方云进. Ni基催化剂在甲烷水蒸气重整中的抗积碳研究[J]. 现代化工, 2022, 42(3): 114-117,122.
GAO Xin-hua, SHEN Wei-hua, FANG Yun-jin. Study on carbon deposition resistance of coated Ni-based catalyst in steam reforming of methane. Modern Chemical Industry, 2022, 42(3): 114-117,122.
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