“瓶中造船”法制备负载Ti的双孔径介孔氧化硅催化剂氧化环己烷的再生及循环使用性能(英文)

作     者：白诗扬 胡新涛 孙继红 任博 王金鹏 

作者机构：Department of Chemistry and Chemical EngineeringCollege of Environmental & Energy EngineeringBeijing University of Technology 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2014年第22卷第8期

页      面：914-920页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Supported by the National Natural Science Foundation of China(21076003,21272005) the Funding Project for the Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of the Beijing Municipality(PHR201107104,005000541211019/20,005000543111517) 

主　　题：介孔二氧化硅 失活催化剂 环氧化反应 环己烯 钛基 反应性能 制备 回收 

摘      要：Ti/BMMs(Ti supported bimodal mesoporous silica) catalysts have been prepared via self-assembly route combined with ship-in-a-bottle method.The recovery and recycling performances of Ti/BMMs were investigated in the epoxidation of cyclohexene.In order to the evaluate the regeneration methods and to examine the deactivation behaviors,the deactivated Ti/BMMs catalysts were washed in chloroform or calcinated at 450 °C for 6 h and then activity of the recovery catalysts were examined.Meanwhile,the structure features and surface properties of the regenerated catalysts were characterized by X-ray diffraction,N_2-sorption analysis,scanning electron microscopy,transmission electron microscopy,Fourier transform infrared spectroscopy,thermogravimetric analysis,UV visible spectroscopy and X-ray photoelectron spectroscopy.The results showed that the typical bimodal mesoporous structure of recycled Ti/BMMs catalysts was still maintained,and the phenomenon of Ti leaching during the catalytic process and recovery was negligible.In particular,spectroscopic observations indicated that the effects of the regeneration methods on the tetrahedrally-coordinated Ti species and catalytic deactivation were remarkable.The main reasons were related to the polarities of used solvents during recovery tests,the environment medium of adsorbed water inside mesopore channels and the deposition of bulky molecules of by-products on the mesoporous surface.