NiO-SiO2，NiO-Al2O3和NiO-Al2O3-SiO2催化剂上顺酐选择加氢性能的比较

The NiO-SiO2 NiO-Al2O3 and NiO-Al2O3-SiO2 aerogel catalysts were prepared by sol-gel method. The silicon and aluminum in the catalysts came from n-ethyl silicate and Al(NO3) 3, respectively- Ni(NO3) 2 was used as the Ni precursor. The results showed that the conversion of maleic anhydride over the three catalysts are all higher than 99%, while the selectivity differs from each other different. The NiO-SiO2 catalyst gave 80.1% selectivity toγ-butyrolactone, while the NiO-Al2O3 catalyst had as high as 99% selectivity to succinic anhydride. As for the NiO-Al2O3-SiO2 catalyst, 74.5% to succinic anhydride and 25.5% toγ-butyrolactone were obtained respectively. The characterizations from the XRD and TPR showed that there are significant differences for those three catalysts, such as crystal forms, NiO dispersion, and the interactions between NiO and supports in the catalysts, which may result in the different catalytic performance in selective hydrogenation of maleic anhydride.