文献类型：期刊文献

中文题名：载体对草酸二甲酯加氢铜基催化剂的影响

英文题名：Effect of Supports on Copper-Based Catalysts for Dimethyl Oxalates Hydrogenation

作者：李竹霞[1];钱志刚[1];赵秀阁[1];肖文德[1]

机构：[1]华东理工大学联合反应工程研究所,上海200237

年份：2005

卷号：31

期号：1

起止页码：27

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：2005149026094);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：SiO2栽体;铜基催化剂;草酸二甲酯;加氢;活性组分

外文关键词：SiO_2 supports; copper-based catalyst; dimethyl oxalate; hydrogenation; active component

摘要：以草酸二甲酯加氢反应为基础,研究了二氧化硅载体对铜基催化剂加氢反应性能的影响。催化剂分别以气相硅溶胶、硅胶、二氧化硅为载体,采用沉淀沉积法制备了Cu/SiO2催化剂(wCu=0.20),分别记为CS1、CS2、CS3,催化剂的活性从CS3、CS2到CS1依次增加。XRD测试物相结构表明:氧化态CS2和CS3中存在CuO晶相,而氧化态CS1中活性组分呈无定形分布。还原态催化剂的XRD测试表明催化剂中有Cu2O和Cu0存在,且Cu2O/Cu0的比例按CS3、CS2、CS1顺序增加,XPS分析证实了3个催化剂表面Cu2O/Cu0的比例有相应的变化趋势。这说明Cu2O和Cu0与草酸二甲酯加氢反应活性相关,提高Cu2O的含量,可以提高催化剂的活性。
Catalytic hydrogenation of dimethyl oxalate was studied over copper catalyst supported on three kinds of silica: silica sol, silica gel, fumed silica, named CS1, CS2, CS3 respectively. The Cu/SiO2 catalyst supported on silica sol was prepared by the homogeneous deposition-precipitation of the mixture of aqueous cuprammonia complex and silica sol. Those catalysts supported on silica gel and fumed silica were obtained by the heterogeneous deposition-precipitation of aqueous solution of Cu(NO)3 and ammonia. Activity evaluation results show that at 468 K, the catalyst CS1 presents best performance. XRD (X-ray diffraction) patterns show there are CuO on oxidized catalysts CS2 and CS3, but not on oxidized CS1. After reduction, the content of Cu2O increases from CS3 to CS1. XPS (X-ray photoelectron spectroscopy) analysis indicates that the ratio of Cu2O/Cu0 also increases as with the same sequences. These results sug-gest that the activity of catalyst is improved with the increase of Cu2O.