文献类型：期刊文献

英文题名：Nickel nanoparticles embedded in the framework of mesoporous TiO 2: Efficient and highly stable catalysts for hydrodechlorination of chlorobenzene

作者：Xu, Ye[1]; Ma, Jinqiang[1]; Xu, Yuanfeng[1]; Li, Hui[1]; Li, Hexing[1]; Li, Ping[2]; Zhou, Xinggui[2]

机构：[1] Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China; [2] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2012

卷号：413-414

起止页码：350

外文期刊名：Applied Catalysis A: General

收录：EI(收录号：20120214676128)

语种：英文

外文关键词：Temperature programmed desorption - X ray photoelectron spectroscopy - High resolution transmission electron microscopy - Mesoporous materials - Metal nanoparticles - Hydrogen - Nickel - Catalyst supports - X ray diffraction

摘要：Mesoporous TiO2-supported metallic Ni catalysts were prepared through a multicomponent assembly approach, where surfactant, titania, and nickel precursor were cooperatively assembled in a one-pot process. With the characterization of transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, N2 physisorption, hydrogen temperature-programmed reduction, and hydrogen temperature-programmed desorption, the resultant Ni nanoparticles were identified to be homogenously embedded within the framework of TiO2 ranging in size from 1 to 6 nm. The embedment of Ni within the framework of support resulted in larger interface between Ni and support and thus stronger Ni-TiO2 interaction. During the gas-phase hydrodechlorination of chlorobenzene reaction, the as-prepared 0.23%-Ni/TiO2-DS delivered turnover frequency up to 1.5 times greater than that associated with the reference Ni/TiO2 catalyst prepared by conventional incipient-wetness impregnation method. Meanwhile, the as-prepared 0.23%-Ni/TiO2-DS also exhibited much improved stability for a continuous reaction of 30 h than the reference catalyst. The remarkable enhancement of the catalytic performances was found to depend on the strong metal-support interaction. ? 2011 Elsevier B.V.