单缺位型磷钨杂多化合物的制备及催化性能的实验设计  

Preparation of Mono-vacancy Phosphotungsticheteropoly Compounds and Experimental Design of Their Catalytic Performance

作　　者：王成君[1] 苏琼[1] 李贵贤[2] 王洁[2] 段志英 WANG Cheng-jun;SU Qiong;LI Gui-xian;WANG Jie;DUAN Zhi-ying(Key Laboratory of Utility of Environmental Friendly Composite Materials and Biomass in Universities of Gansu Province,School of Chemical Engineering,Northwest Minzu University,Lanzhou 730030,China;College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]西北民族大学化工学院甘肃省高校环境友好复合材料及生物质利用省级重点实验室,甘肃兰州730124 [2]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《西北民族大学学报（自然科学版）》2020年第3期20-26,共7页Journal of Northwest Minzu University(Natural Science)

基　　金：西北民族大学教育教学改革研究一般项目(2020YBJG-22)。

摘　　要：通过合成的一系列溴代十六烷基吡啶修饰的过渡金属取代单缺位的Keggin型磷钨杂多化合物PW 11 O 39 M(II/III)(M=Fe、Co、Ni、Cu、Mn),并利用红外和X-射线光谱对其结构进行了表征.以其为相转移催化剂,评价了合成的杂多化合物对苯乙烯氧化反应的催化活性.通过观察反应温度、反应时间、催化剂用量和叔丁基过氧化氢用量对(Cpyr)5PW 11 Co催化苯乙烯氧化反应的影响,发现合成的过渡金属取代的单缺位Keggin结构磷钨杂多化合物,当反应温度为80℃,反应时间为8 h时,(Cpyr)5PW 11 Co具有最高的催化活性,反应物苯乙烯的转化率高达89.3%,目标产物环氧苯乙烷的选择性为78%,且催化剂的重复利用性较好.A series of transition metal substituted mono-vacancy Keggin-type phosphotungsticheteropoly compounds PW 11 O 39 M(II/III)(M=Fe,Co,Ni,Cu,Mn),modified by cetylpyridinium bromide were synthesized and characterized by IR and X-ray spectra.Using it as a phase transfer catalyst,the catalytic activity of the synthesized heteropoly compounds for the oxidation of styrene was evaluated.The effects of reaction temperature,reaction time,the amount of catalyst and tert-butyl hydrogen peroxide on the oxidation of styrene catalyzed by(Cpyr)5PW 11 Co were investigated.The results show that,(Cpyr)5PW 11 Co has the highest catalytic activity when the transition metal substituted mono-vacancy Keggin structure phosphotungsticheteropoly compound is synthesized when the reaction temperature is 80℃and the reaction time is 8 hours.The conversion of styrene is as high as 89.3%,and the selectivity of the target product ethylene oxide is 78%.The reusability of the catalyst is good.

关 键 词：单缺位杂多化合物 催化氧化 苯乙烯 环氧苯乙烷 

分 类 号：O643.36[理学—物理化学]