Ceria supported on sulfated zirconia as a superacid catalyst for selective catalytic reduction of NO with NH3

Shan Gao; Xiongbo Chen; Haiqiang Wang; Jiansong Mo; Zhongbiao Wu; Yue Liu; Xiaole Weng

doi:10.1016/j.jcis.2012.12.034

Ceria supported on sulfated zirconia as a superacid catalyst for selective catalytic reduction of NO with NH3

J Colloid Interface Sci. 2013 Mar 15:394:515-21. doi: 10.1016/j.jcis.2012.12.034. Epub 2013 Jan 9.

Authors

Shan Gao¹, Xiongbo Chen, Haiqiang Wang, Jiansong Mo, Zhongbiao Wu, Yue Liu, Xiaole Weng

Affiliation

¹ Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.

PMID: 23375804
DOI: 10.1016/j.jcis.2012.12.034

Abstract

In this paper, ceria supported on sulfated zirconia (CeSZ) as a superacid catalyst was synthesized and the resulted performances for selective catalytic reduction (SCR) of NO with NH(3) were investigated. Experimental results revealed that the sulfation of zirconia supports could greatly improve the SCR activity of the catalysts. Among the tested samples, the CeSZ catalyst with Ce/Zr mole ratio at 0.095 possessed the highest NO conversion (i.e., 98.6% at ca. 420 °C and 180,000 h(-1)). The sulfation had led to a formation of pure tetragonal phase of ZrO(2), a well dispersion of CeO(2), abundant stable superacid sites, increasing surface area and enrichment of Ce(3+) on the surface, all of which were responsible for its excellent performance in SCR of NO with NH(3).