Preparation of silica-coated Pt metal nanoparticles using microemulsion and their catalytic performance

被引：32

作者：

Hori, Kunio ^{[1
]}

Matsune, Hideki ^{[1
]}

Takenaka, Sakae ^{[1
]}

Kishida, Masahiro ^{[1
]}

机构：

[1] Kyushu Univ, Dept Chem Engn, Grad Sch Engn, Nishi Ku, Fukuoka 8190395, Japan

来源：

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2006年 / 7卷 / 07期

关键词：

Pt metal nanoparticle covered with silica; microemulsion; competitive oxidation of hydrocarbons;

D O I：

10.1016/j.stam.2006.09.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pt-SiO2 catalysts were prepared by using water-in-oil type microemulsion. The catalysts were prepared by hydrolysis of tetraethylorthosilicate in the microemulsion containing Pt species, followed by calcination in air and reduction with H-2. This preparation method for Pt-SiO2 provided Pt metal nanoparticles with a diameter of ca. 6nm covered uniformly with silica layers, while a conventional impregnation method formed Pt metal particles supported on the silica surface. The Pt catalysts coated with silica (coat-Pt) showed different catalytic performance for the competitive oxidation of mixed hydrocarbons from Pt catalysts supported on silica (imp-Pt), i.e. in the competitive oxidation of methane and iso-butane, coat-Pt catalysts preferentially oxidized methane, while iso-butane was oxidized selectively over imp-Pt catalysts. The results of the adsorption of Ar on coat-Pt showed that silica in coat-Pt had porous structures of pore diameters < I nm. Because the porous structure of silica, which wrapped Pt metal particles, controlled the diffusion rate of reactant molecules, coat-Pt showed a specific catalytic performance for competitive oxidation. (c) 2006 Published by NIMS and Elsevier Ltd.

引用

页码：678 / 684

页数：7

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