期刊
CATALYSIS TODAY
卷 207, 期 -, 页码 200-211出版社
ELSEVIER
DOI: 10.1016/j.cattod.2012.04.016
关键词
NOX storage; Lean NOX trap; Pt/Ba/Al2O3; Thermal durability; Sulfur resistance
资金
- Spanish Ministry of Education (MEC) [CTQ2006-09780, CTQ2009-10649]
- Canada Foundation for Innovation
Ba-, K-, and Ba-K-based NOX storage/reduction (NSR) catalysts were prepared, with and without Sn as a promotor. Catalysts and catalyst/soot mixtures were evaluated for NOX reduction and soot oxidation under standard NSR cycling conditions. The activity study was accompanied by dispersion measurements, TEM, XRD, and XPS characterization. It was found that modification with Sn did not significantly influence NOX adsorption, however, Sn notably enhanced soot oxidation for Ba-based systems. This was correlated to Pt oxidation state modification. Also the addition of Sn to the Pt-Ba and Pt-Ba-K catalysts lowered the onset temperature of S release. The Pt-Ba-K catalyst had higher stability against S-poisoning, likely due to the preferential adsorption of S onto K-species, partially maintaining Ba sites for NOX trapping. (C) 2012 Elsevier B. V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据