Effect of Support on the Activity of Ag-based Catalysts for Formaldehyde Oxidation

被引：101

作者：

Zhang, Jianghao ^{[1
]}

Li, Yaobin ^{[1
]}

Zhang, Yan ^{[1
]}

Chen, Min ^{[1
]}

Wang, Lian ^{[1
]}

Zhang, Changbin ^{[1
]}

He, Hong ^{[1
]}

机构：

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

中国国家自然科学基金;

关键词：

ROOM-TEMPERATURE; SELECTIVE OXIDATION; OXIDE; NOX; PERFORMANCE; REDUCTION; CERIA; AG/GAMMA-AL2O3; DECOMPOSITION; NANOPARTICLES;

D O I：

10.1038/srep12950

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ag-based catalysts with different supports (TiO2, Al2O3 and CeO2) were prepared by impregnation method and subsequently tested for the catalytic oxidation of formaldehyde (HCHO) at low temperature. The Ag/TiO2 catalyst showed the distinctive catalytic performance, achieving the complete HCHO conversion at around 95 degrees C. In contrast, the Ag/Al2O3 and Ag/CeO2 catalysts displayed much lower activity and the 100% conversion was reached at 110 degrees C and higher than 125 degrees C, respectively. The Ag-based catalysts were next characterized by several methods. The characterization results revealed that supports have the dramatic influence on the Ag particle sizes and dispersion. Kinetic tests showed that the Ag based catalyst on the TiO2, Al2O3 or CeO2 supports have the similar apparent activation energy of 65 kJ mol(-1), indicating that the catalytic mechanism keep immutability over these three catalysts. Therefore, Ag particle size and dispersion was confirmed to be the main factor affecting the catalytic performance for HCHO oxidation. The Ag/TiO2 catalyst has the highest Ag dispersion and the smallest Ag particle size, accordingly presenting the best catalytic performance for HCHO oxidation.

引用

页数：10

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