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以正硅酸乙酯和硝酸铝分别为硅源和铝源,硝酸镍为活性组分前驱物,采用溶胶 凝胶法制备了NiO SiO2,NiO Al2O3和NiO Al2O3 SiO2催化剂。顺酐液相选择加氢活性和选择性评价结果表明:顺酐在三种催化剂上转化率都在99%以上,而产物的选择性有较大的差别,其中NiO SiO2催化剂上γ 丁内酯的选择性达80 1%,NiO Al2O3催化剂上丁二酸酐选择性达99%以上,NiO Al2O3 SiO2催化剂上两种产物都有。XRD,TPR等体相结构和表面结构的表征说明,三种催化剂的相组成、NiO的分散性及与载体的相互作用存在明显差别,这些差别可能是造成不同选择加氢性能的原因。
NiO SiO2, NiO Al2O3 and NiO Al2O3 SiO2 catalysts were prepared by sol-gel method using tetraethyl orthosilicate and aluminum nitrate as silicon source and aluminum source respectively and nickel nitrate as active component precursor. The results of selective hydrogenation and selectivity of maleic anhydride showed that the conversion of maleic anhydride was above 99% on the three catalysts, and the selectivity of the product was quite different. Among them, γ-butyrolactone Selectivity of 80 1%, selectivity to succinic anhydride over 99% on NiO Al2O3 catalyst, and both products on NiO Al2O3 SiO2 catalyst. The characterization of bulk structure and surface structure by XRD, TPR shows that there are obvious differences in phase composition, NiO dispersion and interaction with the support. These differences may be the reason for the different selective hydrogenation properties.