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	Improvement of catalytic activity and sulfur-resistance of Ag/TiO2-Al2O3 for NO reduction with propene under lean burn conditions
	Li, Junhua ; Zhu, Yongqing ; Ke, Rui ; Hao, Jiming
	2010-05-10 ; 2010-05-10
关键词	selective catalytic reduction of NO Ag/TiO2-Al2O3 activity enhancement SO2 poisoning lewis acid sites SELECTIVE REDUCTION ALUMINA CATALYSTS AG/AL2O3 CATALYST HYDRODESULFURIZATION ACTIVITY SO2 SILVER OXYGEN OXIDES AG/GAMMA-AL2O3 HYDROCARBONS Chemistry, Physical Engineering, Environmental Engineering, Chemical
中文摘要	Ag-based catalysts supported on various metal oxides, A1(2)O(3), TiO2, and TiO2-Al2O3, were prepared by the sot-gel method. The effect of SO2 on catalytic activity was investigated for NO reduction with propene under lean burn condition. The results showed the catalytic activities were greatly enhanced on Ag/TiO2-Al2O3 in comparison to Ag/Al2O3 and Ag/TiO2, especially in the low temperature region. Application of different characterization techniques revealed that the activity enhancement was correlated with the properties of the support material. Silver was highly dispersed over the amorphous system of TiO2-Al2O3. NO3- rather than NO2- or NOx reacted with the carboxylate species to form CN or NCO. NO2 was the predominant desorption species in the temperature programmed desorption (TPD) of NO on Ag/TiO2-Al2O3. More amount of formate (HCOO-) and CN were generated on the Ag/TiO2-Al2O3 catalyst than the Ag/Al2O3 catalyst, due to an increased number of Lewis acid sites. Sulfate species, resulted from SO2 oxidation, played dual roles on catalytic activity. On aged samples, the slow decomposition of accumulated sulfate species on catalyst surface led to poor NO conversion due to the blockage of these species on active sites. On the other hand, catalytic activity was greatly enhanced in the low temperature region because of the enhanced intensity of Lewis acid site caused by the adsorbed sulfate species. The rate of sulfate accumulation on the Ag/TiO2-Al2O3 system was relatively slow. As a consequence, the system showed superior capability for selective adsorption of NO and SO2 toleration to the Ag/Al2O3 catalyst. (C) 2007 Elsevier B.V. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23348]
专题	清华大学
推荐引用方式 GB/T 7714	Li, Junhua,Zhu, Yongqing,Ke, Rui,et al. Improvement of catalytic activity and sulfur-resistance of Ag/TiO2-Al2O3 for NO reduction with propene under lean burn conditions[J],2010, 2010.
APA	Li, Junhua,Zhu, Yongqing,Ke, Rui,&Hao, Jiming.(2010).Improvement of catalytic activity and sulfur-resistance of Ag/TiO2-Al2O3 for NO reduction with propene under lean burn conditions..
MLA	Li, Junhua,et al."Improvement of catalytic activity and sulfur-resistance of Ag/TiO2-Al2O3 for NO reduction with propene under lean burn conditions".(2010).

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