文献类型：期刊文章

作　　者：李白滔[1] 罗歆[1] 黄静[1] 王秀军[1] 梁振兴[1]

机构地区：[1]华南理工大学化学与化工学院,广东省燃料电池技术重点实验室,广东广州510640

出　　处：《Chinese Journal of Catalysis》

基　　金：supported by Guangdong Science and Technology Planning Project(2015A020216002);Guangdong Natural Science Foundation(2014A030313259);the National Natural Science Foundation of China(21543014,21173086,U1301245)~~

年　　份：2017

卷　　号：38

期　　号：3

起止页码：518-528

语　　种：中文

收录情况：AJ、BDHX、BDHX2014、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2017_2018、EI(收录号：20171403517154)、JST、RSC、SCIE、SCOPUS、ZGKJHX、核心刊

摘　　要：The heterogeneously copper-catalyzed oxidative cleavage of styrene was studied using copper-doped mesoporous KIT-6（CU-KIT-6_x） prepared via pH adjustment（where x is the pH：1.43,2.27,3.78,3.97,4.24 or 6.62）.Variations in the catalyst structure and morphology with pH values were characterized by X-ray power diffraction,nitrogen adsorption-desorption analysis,transmission electron microscopy and X-ray photoelectron spectroscopy.As the pH value applied during the initial synthesis,the resulting Cu-KIT-6_x exhibited different structural,textural and surface characteristics,especially in terms of specific copper species and copper content At a pH value of 3.78,approximately 4.6 wt%copper（Ⅱ） was successfully incorporated into the framework of the initial KIT-6,in the form of-Cu-O-Si- groups.The catalytic performance of each catalyst was evaluated by following the epoxidation of styrene,employing tert-butyl hydroperoxide as the oxidant and CH_3CN as the solvent.A significant styrene conversion of 43.5%with 86.6%selectivity for the desired styrene epoxide was obtained over the Cu-KIT-63.78.A higher Cu content,an ordered cubic laid mesoporous architecture and various specific textural characteristics all combined to endow the Cu-KIT-63.78 with high catalytic activity and good stability.

关 键 词：Mesoporous material  KIT-6  Styrene epoxidation  pH-adjusting  

分 类 号：O643.36]