第二金属对Co/SiO_2加氢催化剂结构和性能的影响(英文)  

Effect of Metal Additives on Structure and Properties of a Co/SiO_2 Hydrogenation Catalyst

作　　者：薛晶晶[1,2] 崔芳[1] 黄志威[1] 左建良[1,2] 陈静[1] 夏春谷[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049

出　　处：《催化学报》2012年第10期1642-1649,共8页

基　　金：国家自然科学基金(21133011)~~

摘　　要：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 effects of metal additives（Zn,Fe,Cu,and Sn） on the properties and catalytic performance of a Co/SiO2 catalyst（prepared by a co-precipitation method） in the liquid-phase hydrogenation of ethyl lactate were investigated.The electronic properties and surface distribution of Co in the catalyst were significantly changed by incorporation of the additives.The particle size of the cobalt species was reduced,which strengthened the interaction between the cobalt particles and the silica support and decreased the reducibility of the catalyst.As a consequence,both ethyl lactate conversion and 1,2-propanediol selectivity decreased upon incorporation of the additives.Ethyl lactate conversion was related less to the size and surface area of the catalyst particles than to the distribution of the cobalt species and the reducibility of the catalyst.

关 键 词：钴 金属添加物 结构 乳酸酯 氢化 

分 类 号：O643.36[理学—物理化学]