In2O3/Al2O3 catalysts for NOx reduction in lean condition

被引:70
作者
Park, PW
Ragle, CS
Boyer, CL
Balmer, ML
Engelhard, M
McCready, D
机构
[1] Caterpillar Inc, Tech Ctr E854, Peoria, IL 61656 USA
[2] Pacific NW Natl Lab, Richland, WA 99352 USA
关键词
NOx; reduction; lean; In2O3; Al2O3; XPS; XRD; TPR; acrolein; acetaldehyde;
D O I
10.1006/jcat.2002.3667
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 lean NOx performance and catalytic properties of In2O3/Al2O3 catalysts were investigated. High lean NO,, activity was observed when propene was used as a reductant in the presence of 9% O-2 and 7% H2O at a space velocity of 30,000 h(-1). The optimum lean NOx activity of In2O3/Al2O3 catalysts was observed at a loading of 2.5 wt% indium on y-Al2O3 which was prepared by a Sol-gel technique (230 m(2)/g). When propane was used as a reductant, the In2O3/Al2O3 catalyst did not promote NOx reduction compared to the alumina substrate. X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and temperature-programmed reduction (TPR) have been used to characterize a series of In2O3/Al2O3 catalysts to increase understanding of the surface structure of indium oxide species on the alumina support. The XRD data indicated that crystalline In2O3 was present at In2O3 loadings >5 wt% and the quantity of the crystalline phase increased as a function of indium loading. XPS results suggested that indium oxide existed as a well-dispersed phase up to 10 wt% indium. The well-dispersed or reducible indium oxide species below 400 C in TPR experiments were assigned as the sites which activate propene to oxygenated hydrocarbons such as acetaldehyde and acrolein. Alumina sites readily utilize the oxygenated hydrocarbons to reduce NOx. A bifunction mechanism was proposed to explain high NO, reduction over In2O3/Al2O3 catalysts. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:97 / 105
页数:9
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