Catalytic carbon oxidation over Ag/Al2O3

被引：30

作者：

Villani, K ^{[1
]}

Brosius, R ^{[1
]}

Martens, JA ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Ctr Oppervlaktechem & Katalyse, B-3001 Louvain, Belgium

来源：

JOURNAL OF CATALYSIS | 2005年 / 236卷 / 01期

关键词：

Ag/Al2O3; carbon oxidation; surface nitrates; particulate trap regeneration;

D O I：

10.1016/j.jcat.2005.09.018

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：

The potential of silver on alumina (Ag/Al2O3) catalyst for the oxidation of carbon particles in simulated lean combustion gas was explored. At low temperatures in the presence of NOx, oxygen, and water, the silver of the catalyst is transformed into silver nitrate. On heating, finely dispersed silver metal is formed that catalyzes the oxidation of NO into NO2. The carbon oxidation rates in loose mixtures of carbon black and nitrated Ag/Al2O3 catalyst were determined gravimetrically using a magnetic suspension balance and gas mixture comprising nitric oxide, oxygen, and water. The temperature for achieving carbon oxidation was lower with nitrated Ag/Al2O3 than with Pt/Al2O3. The finely dispersed metallic state of the silver required for efficient NO oxidation can be regenerated in cycles involving cooling and heating in the presence of NOx. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：172 / 175

页数：4

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