化工进展2019，Vol.38Issue(3)：1396-1402,7.DOI:10.16085/j.issn.1000-6613.2018-0408
溶剂热浸渍法制备高稳定性Zn(OAc)2/SiO2催化剂及其催化合成苯氨基甲酸甲酯
Preparation of Zn (OAc) 2/SiO2 catalyst with better stability prepared by solvothermal impregnation method and its application in methyl N-phenyl carbamate
摘要
Abstract
Zn (OAc) 2 exhibits excellent catalytic performance in the methyl N-phenyl carbamate (MPC) synthesis using aniline and dimethyl carbonate (DMC), but it cannot be reused. Zn (OAc) 2/SiO2 catalyst was prepared by solvothermal impregnation with DMC as the solvent in this paper. Zn (OAc) 2/SiO2 was characterized by XRD、 FTIR and TG-DTA. The results suggested that Zn (OAc) 2 and ZnO were well dispersed on SiO2 surface. At reaction temperature of 190℃, reaction time of 5 h, nDMC∶nanilineof 20∶1 and maniline: mZn (OAc) 2/SiO2 of 0.2, Zn (OAc) 2/SiO2 showed the best catalytic performance, giving an aniline conversion of 97.2％ and a MPC selectivity of 89.4％. The obtained Zn (OAc) 2/SiO2 showed better stability than that prepared by incipient impregnation. After the Zn (OAc) 2/SiO2 was used for the seventh time, aniline conversion and MPC selectivity were found to be 79.1％ and 79.2％, respectively and the catalytic activity decrease is attributed to the formation of ZnO. The deactivated Zn (OAc) 2/SiO2 can be regenerated with the catalytic activity almost the same as that of the fresh catalyst.关键词
碳酸二甲酯/苯氨基甲酸甲酯/苯胺/Zn(OAc)2/SiO2/溶剂热浸渍/催化剂/稳定性/再生Key words
dimethyl carbonate/methyl N-phenyl carbamate/aniline/zinc acetate/silica/solvothermal impregnation/catalyst/stability/regeneration分类
化学化工引用本文复制引用
彭向聪,王志苗,李红芹,薛伟,李芳,王延吉..溶剂热浸渍法制备高稳定性Zn(OAc)2/SiO2催化剂及其催化合成苯氨基甲酸甲酯[J].化工进展,2019,38(3):1396-1402,7.基金项目
国家自然科学基金(21236001,21776057) （21236001,21776057）
天津市自然科学基金(17JCYBJC20100) （17JCYBJC20100）
