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通过考察Co/SiO2催化剂中活性组分的结构变化及其催化乳酸酯液相氢化反应结果,来研究第二金属添加物对催化剂结构及其催化性能的影响.结果表明,随着金属添加物的加入双金属催化剂中金属Co的表面电子性质以及分散度不断变化,而Co物种颗粒粒径不断减小,因此Co物种和载体SiO2间相互作用不断增强,从而降低Co还原度.乳酸酯氢化反应结果表明,催化剂中活性组分的颗粒大小及其比表面积以及Co物种的还原度和分散度均影响其氢化反应的活性.
The effect of the second metal additive on the structure and catalytic performance of the catalyst was investigated by investigating the structural changes of the active components in the Co / SiO2 catalyst and the results of the liquid phase hydrogenation of the catalyst. The results showed that with the addition of the metal additive The surface electronic properties and the dispersion degree of the metal Co in the bimetallic catalyst change continuously while the particle size of the Co species decreases continuously and the interaction between the Co species and the carrier SiO2 is continuously enhanced and the reduction degree of Co is reduced. The reaction results show that the particle size and the specific surface area of the active component of the catalyst and the degree of reduction and dispersion of the Co species all affect the activity of the hydrogenation reaction.