文献类型：期刊文献

英文题名：Selective hydrogenation of phenol to cyclohexanone over Pd nanoparticles encaged hollow mesoporous silica catalytic nanoreactors

作者：Yang, Caoping[1];Li, Kaijie[1];Wang, Junyou[1];Zhou, Shenghu[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Sch Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2021

卷号：610

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20205209680933);WOS:【SCI-EXPANDED(收录号:WOS:000613265700003)】；

基金：S. Zhou thank the National Natural Science Foundation of China for financial supports (Grant No. 22078099 and 21776090), and this work is also partially supported by Natural Science Foundation of Shanghai (Grant No. 17ZR1440500).

语种：英文

外文关键词：Hollow; Nanoreactors; Hydrogenation; Catalysis; Cyclohexanone; Mesoporous; Silica

摘要：Pd nanoparticles (NPs) encaged hollow mesoporous silica nanoreactors (Pd@HMSNs) are prepared for hydrogenations of phenol, cresols and chlorophenols to cyclohexanone derivatives. Pd@HMSNs feature - 4 nm Pd NPs in similar to 16 nm hollow cavities of similar to 30 nm HMSNs. Such Pd@HMSNs are highly thermally and catalytically stable. At mild reaction conditions, Pd@HMSNs efficiently catalyze hydrogenations of phenol and m-cresol to cyclohexanone derivatives with >= 98.3 % selectivity at >= 99.0 % conversions. Hydrogenations of o- and m-chlorophenol over Pd@HMSNs give cyclohexanone with >= 97.3 % selectivity at 100.0 % conversions, demonstrating a beneficial effect of such HMSNs for consecutive reactions. The confinement of Pd NPs inside hollow cavities of mesoporous nanoreactors greatly promotes collision times of reactant molecules with Pd NPs, resulting in an enhanced catalytic efficiency, while the residence of Pd NPs inside cavities provides a protecting effect for Pd NPs and is beneficial to thermal and catalytic stabilities.