Deposition-precipitation method to obtain supported gold catalysts:: dependence of the acid-base properties of the support exemplified in the system TiO2-TiOxNy-TiN

被引：39

作者：

Centeno, MA

Carrizosa, I

Odriozola, JA

机构：

[1] Univ Sevilla, CSIC, Dept Quim Inorgan, Ctr Mixto, Seville 41092, Spain

[2] Univ Sevilla, CSIC, Inst Ciencia Mat, Ctr Mixto, Seville 41092, Spain

来源：

APPLIED CATALYSIS A-GENERAL | 2003年 / 246卷 / 02期

关键词：

gold catalysts; deposition-precipitation; titanium oxynitrides; CO oxidation;

D O I：

10.1016/S0926-860X(03)00058-9

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：

A deposition-precipitation method was used for preparing TiO2, TiOxNy and TiN supported gold catalysts. The dispersion and average size of the gold particles are dependent of the nature of the support, probably of their acid-base properties. Transmission electron microscopy (TEM) observations reveal an homogeneous distribution of gold particles lower than 4 nm on TiO2. However. on TiN, a wide distribution of gold particle diameters ranging from 3 nm to 1 mum is detected. On TiOxNy support, where both TiO2 (anatase) and TiN phases are present, gold is selectively deposited on the oxide. On the other hand, only the fresh Au/TiO2 sample shows any room temperature activity to the CO oxidation, according with the homogeneous distribution and lower average size of their gold particles. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：365 / 372

页数：8

共 9 条

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