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Title: The role of SO2 in the reduction of NO by CO on La2O2S
Authors: Lau, Ngai Ting
Fang, Ming
Chan, Chak-Keung
Keywords: Lanthanum oxysulfide
Reaction step
Temperature-programmed reaction
Issue Date: 2006
Citation: Journal of catalysis, v. 245, no. 2, January 2007, p. 301-307
Abstract: The decomposition of NO and the reduction of NO by CO on La2O2S are studied using temperature-programmed reaction technique coupled with fast mass spectrometry, powder X-ray diffraction and X-ray photoelectron spectroscopy. The role of SO2 plays in the reduction is explored. It is found that the decomposition of NO is a favorable reaction step for the reduction of NO by CO achieved through a sulfur-assisted path. The oxygen produced in the decomposition is removed by the sulfur in the oxysulfide as SO2, which is in turn reduced back to sulfur by CO on La2O2S. External supply of sulfur such as SO2 in the feed is needed to maintain the population of sulfur in the oxysulfide and thus make the reduction sustainable.
Rights: Journal of Catalysis © copyright (2006) Elsevier. The Journal's web site is located at
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