TPO characterization of ethanol reduced Pd nanoparticles supported on SiO2

被引：18

作者：

Horváth, A ^{[1
]}

Beck, A ^{[1
]}

Sárkány, A ^{[1
]}

Guczi, L ^{[1
]}

机构：

[1] Hungarian Acad Sci, Dept Surface Chem & Catalysis, Inst Isotope & Surface Chem, Chem Res Ctr, H-1525 Budapest, Hungary

来源：

SOLID STATE IONICS | 2002年 / 148卷 / 1-2期

基金：

匈牙利科学研究基金会;

关键词：

palladium/silica; nanoparticles; ethanol; controlled reduction; temperature-programmed oxidation (TPO);

D O I：

10.1016/S0167-2738(02)00053-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Silica-supported Pd catalysts were prepared at 298-353 K from Pd(II) chloride or Pd(II) acetate in suspension of SiO2 and ethanol-water or ethanol-toluene mixtures, respectively. Reduction of Pd ions diffusing from liquid phase was ensured in an ethanol-rich adsorption layer covering the SiO2 particles. Temperature-programmed oxidation (TPO) measurements were performed to characterize the organic impurities retained by solid phase. Vapour phase reduction adsorption experiments with ethanol confirmed that under the reported reduction conditions, the Pd nanoparticles decompose ethanol and the CO formed remains chemisorbed on the Pd sites. Upon contacting the samples with air during the drying process to eliminate the solvent, the CO molecules are immediately removed from Pd sites by O-2, and thereby, a significant fraction (22-34%) of Pd sites becomes accessible for catalytic reactions. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：219 / 225

页数：7

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