尿素水解法制备高活性Cu-Ag/SiO_(2)催化剂及其催化草酸二甲酯加氢性能  

Highly active Cu-Ag/SiO_(2)catalysts prepared by urea hydrolysis method in dimethyl oxalate hydrogenation

作　　者：张芳 吴鹏 何观伟 卞雯 袁岚 殷迪 Zhang Fang;Wu Peng;He Guanwei;Bian Wen;Yuan Lan;Yin Di(The Northwest Research Institute of Chemical Industry Co.,Ltd.,Xi’an 710061,Shaanxi,China)

机构地区：[1]西北化工研究院有限公司,陕西西安710061

出　　处：《工业催化》2023年第7期45-49,共5页Industrial Catalysis

基　　金：陕西延长石油(集团)有限责任公司科技计划项目(ycsy2021qnjj-A-02)。

摘　　要：采用尿素水解法制备了系列xCu-Ag/SiO_(2)催化剂,并用于催化草酸二甲酯(DMO)加氢合成乙醇酸甲酯(MG),使用BET、XRF、XRD、FT-IR和H_(2)-TPR对催化剂物化结构进行表征,考察不同Cu/Ag质量比对催化剂物化性质及催化活性的影响。结果表明,合适的Cu/Ag比值可有效提高催化剂的比表面积、增强Cu和Ag物种在SiO_(2)载体上高度分散、抑制Cu粒子的聚集生长、产生更多的活性位点,从而提高催化剂的反应活性。当Cu/Ag质量比为2时,催化剂活性最佳,草酸二甲酯转化率和乙醇酸甲酯选择性可达86.9%和85.3%。A series of xCu-Ag/SiO_(2)catalysts have been successfully prepared by urea hydrolysis method for the hydrogenation of dimethyl oxalate(DMO)to methyl glycolate(MG).The physical and chemical structures of the catalysts have been systematically characterized by BET,XRF,XRD,FT-IR and H_(2)-TPR.The effects of Cu/Ag mass ratio on the physicochemical properties and catalytic activity of the catalysts were investigated.The results demonstrated that the appropriate Cu/Ag ratio can effectively increase the specific surface area of the catalyst,enhance the high dispersion of copper and silver components on SiO_(2)support,inhibit the aggregation and growth of copper particles,generate more active sites,and improve the catalyst activity.When Cu/Ag ratio was 2,the catalyst exhibited the best catalytic performance with DMO conversion of 86.9%and MG selectivity of 85.3%.

关 键 词：催化化学 Cu-Ag/SiO_(2)催化剂 尿素 乙醇酸甲酯 草酸二甲酯 加氢 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]