TiO2 supported nano-Au catalysts prepared via solvated metal atom impregnation for low-temperature CO oxidation

被引：19

作者：

Wu, SH ^{[1
]}

Zheng, XC ^{[1
]}

Wang, SR ^{[1
]}

Han, DZ ^{[1
]}

Huang, WP ^{[1
]}

Zhang, SM ^{[1
]}

机构：

[1] Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China

来源：

CATALYSIS LETTERS | 2004年 / 96卷 / 1-2期

关键词：

CO oxidation; nano-particles of gold; TiO2; solvated metal atom impregnation; stability;

D O I：

10.1023/B:CATL.0000029528.60669.cf

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：

TiO2 supported nano-Au catalysts were prepared by solvated metal atom impregnation (SMAI) method. The catalysts were characterized by means of AAS, TPD, H-2 reduction desorption (H-2-RD), XRD, TEM, XPS and tested for low-temperature CO oxidation. XRD and TEM results showed that the pretreatment temperature had an influence on the particle size of Au/TiO2 catalysts. The average particle size increased with the increase in pretreatment temperature. XPS indicated that gold in the catalysts was presented in the form of metallic state clusters. Catalytic studies showed these catalysts were very active and stable in low-temperature CO oxidation. The CO oxidation activity of the catalysts increased as the Au particle size decreased. The measurement results of AAS, TPD and H-2-RD revealed that there were some organic fragments on the surface of Au particles which might be responsible for the high stability of the Au/TiO2 catalysts.

引用

页码：49 / 55

页数：7

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