NiO-SiO2，NiO-Al2O3和NiO-Al2O3-SiO2催化剂上顺酐选择加氢性能的比较
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摘要: 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，NiOAl2O3SiO2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。Abstract: 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.
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Key words:
- maleic anhydride /
- selective hydrogenation /
- aerogel catalysts
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