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通过溶胶-凝胶方法结合超临界干燥技术制备了SiO2和TiO2-SiO2复合氧化物气凝胶载体,采用等体积浸渍法制备了Ni/SiO2和Ni/TiO2-SiO2催化剂,运用BET、H2-TPR、XRD、TEM及FT-IR等手段对催化剂进行了表征,并考察了催化剂在顺酐液相选择加氢合成γ-丁内酯反应中的催化性能.结果表明,Ni/TiO2-SiO2催化剂中Ti-O-Si键的形成增强了NiO与载体的相互作用,促进了NiO在载体表面的分散,得到了晶粒较小的活性Ni0物种,表现出高的加氢活性,在H2压力5.0 MPa、反应温度240℃、反应时间6 h的条件下,顺酐转化率为100%,γ-丁内酯的选择性达94.7%.
SiO2 and TiO2-SiO2 composite oxide airgel carriers were prepared by sol-gel method and supercritical drying technology. Ni / SiO2 and Ni / TiO2-SiO2 catalysts were prepared by the same volume impregnation method. The BET, H2-TPR , XRD, TEM and FT-IR. The catalytic performance of the catalyst in the selective hydrogenation of maleic anhydride to γ-butyrolactone was investigated. The results showed that the catalytic activity of the catalyst in the Ni / TiO2-SiO2 catalyst The formation of Ti-O-Si bond enhances the interaction between NiO and support, promotes the dispersion of NiO on the support surface, and obtains the smaller Ni0 species with smaller grain size and higher hydrogenation activity. Under H2 pressure 5.0 MPa , The reaction temperature was 240 ℃, the reaction time was 6 h, the conversion of maleic anhydride was 100% and the selectivity of γ-butyrolactone was 94.7%.