文献类型：期刊文献

中文题名：Synthesis of Ln-doped MCM-41 mesoporous materials and their catalytic performance in oxidation of styrene

英文题名：Synthesis of Ln-doped MCM-41 mesoporous materials and their catalytic performance in oxidation of styrene

作者：Zhan Wangcheng[1];Lu Guanzhong[1];Guo Yanglong[1];Guo Yun[1];Wang Yunsong[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Adv Mat Lab, Shanghai 200237, Peoples R China

年份：2008

卷号：26

期号：1

起止页码：59

中文期刊名：Journal of Rare Earths

外文期刊名：JOURNAL OF RARE EARTHS

收录：CSTPCD;;EI(收录号：20081211160453);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000254512700013)】；CSCD:【CSCD2011_2012】；

基金：Project supported by the National Basic Research Program of China (2004CB719500);the Commission of Science and Technology of Shanghai Municipality (03DJ14006)

语种：英文

中文关键词：Ln-MCM-41; mesoporous materials; styrene; oxidation; rare earths

外文关键词：Ln-MCM-41; mesoporous materials; styrene; oxidation; rare earths

摘要：Using cetyl-trimethyl-ammonium bromide （CTMAB） as the template agent and tetraethylorthosilicate （TEOS） as the silica source, the MCM-41 mesoporous materials were synthesized with La or Ce incorporated in the framework under hydrothermal conditions. The structure and the state of La or Ce were investigated through the analyses of XRD, nitrogen adsorption-desorption, FT-IR, and UV-Vis. XRD and N2 adsorption-desorption results showed that Ln-MCM-41 exhibited the loss of the lattice ordering of the MCM-41 construct, and larger unit cell parameter and pore diameter than pure silica MCM-41. The FT-IR and UV-Vis results indicated the presence of isolated tetra-coordinated La or Ce ions in the framework and other Ln species dispersed highly on the Ln-MCM-41 surface simultaneously. Furthermore, their catalytic behaviors in the oxidation of styrene were studied using H2O2 as the oxidant. The La-MCM-41 catalysts exhibited high reactivity and the reactivity increased with the increase of the La content in the La-MCM-41 samples. On the contrary, Ce-MCM-41 catalysts showed low reactivity in the oxidation of styrene and the conversion of styrene decreased with the increase of the Ce content in the Ce-MCM-41 samples.
Using cetyl-trimethyl-ammonium bromide (CTMAB) as the template agent and tetraethylorthosilicate (TEOS) as the silica source, the MCM-41 mesoporous materials were synthesized with La or Ce incorporated in the framework under hydrothermal conditions. The structure and the state of La or Cc were investigated through the analyses of XRD, nitrogen adsorption-desorption, FT-IR, and UV-Vis. XRD and N-2 adsorption-desorption results showed that Ln-MCM-41 exhibited the loss of the lattice ordering of the MCM-41 construct, and larger unit cell parameter and pore diameter than pure silica MCM-41. The FT-IR and UV-Vis results indicated the presence of isolated tetra-coordinated La or Ce ions in the framework and other Ln species dispersed highly on the Ln-MCM-41 surface simultaneously. Furthermore, their catalytic behaviors in the oxidation of styrene were studied using H2O2 as the oxidant. The La-MCM-41 catalysts exhibited high reactivity and the reactivity increased with the increase of the La content in the La-MCM-41 samples. On the contrary, Ce-MCM-41 catalysts showed low reactivity in the oxidation of styrene and the conversion of styrene decreased with the increase of the Ce content in the Ce-MCM-41 samples.