文献类型：期刊文献

英文题名：Boosting the catalysis of cesium phosphomolybdate encapsulated in hierarchical porous UiO-66 by microenvironment modulation for epoxidation of alkenes

作者：Hu, Dianwen[1,2];Miao, Songsong[3];Zhang, Pengfei[4];Wu, Siyuan[5];He, Yu-Peng[1,2];Meng, Qingwei[1,2]

机构：[1]Dalian Univ Technol, Ningbo Inst, Ningbo 315016, Peoples R China;[2]Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China;[3]Chinese Acad Sci, Changchun Inst Appl Chem, Changchun 130022, Peoples R China;[4]Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China;[5]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：52

期号：40

起止页码：14676

外文期刊名：DALTON TRANSACTIONS

收录：;EI(收录号：20234314946946);WOS:【SCI-EXPANDED(收录号:WOS:001074889600001)】；

基金：Financial support from the Postdoctoral Research Foundation of Ningbo Institution of Dalian University of Technology (No. 03030001) is gratefully acknowledged.

语种：英文

外文关键词：Catalyst activity - Cesium - Olefins - Styrene

摘要：The chemical microenvironment of polyoxometalates (POMs) encapsulated in metal-organic frameworks (MOFs) presents a significant influence on their catalytic performance, which can be easily regulated by the linker functional group alteration or metal substitution in MOFs. Herein, a series of cesium phosphomolybdate (CsPM) encapsulated in hierarchical porous UiO-66-X composites (CsPM@HP-UiO-66-X, X = H, 2CH3, or 2OH, where X represents the alterable group grafted onto the linker benzene ring) were successfully synthesized through a one pot modulated solvothermal method. The catalytic performances of the obtained materials were explored in alkene epoxidation reaction with tert-butyl hydroperoxide (t-BuOOH). CsPM@HP-UiO-66-2CH3 showed relatively high catalytic activity, stability, and epoxidation selectivity in cyclooctene epoxidation among the CsPM@HP-UiO-66-X composites. Moreover, CsPM@HP-UiO-66-2CH3 was effective in the epoxidation of numerous alkenes, especially cyclic alkenes. The superior catalytic activity of CsPM@HP-UiO-66-2CH3 is mainly attributed to the modulation of the microenvironment surrounding CsPM active sites by introducing a hydrophobic methyl group. Meanwhile, the size-matched effect, the introduction of cesium cations, and the strong metal-support interactions (SMSIs) between CsPM and HP-UiO-66-2CH3 play a crucial role in the stability of CsPM@HP-UiO-66-2CH3. CsPM@HP-UiO-66-2CH3 showed preferable catalytic performance in alkene epoxidation reaction among CsPM@HP-UiO-66-X composites, which is mainly attributed to the modulation of the microenvironment surrounding CsPM active sites with a methyl group.