Journal of Energy Chemistry
ISSN 1003-9953
     
Journal of Natural Gas 2012, Vol. 21 Issue (3) :332-338    DOI: 10.1016/S1003-9953(11)60373-3
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Selective catalytic reduction of NO by C2H2 over Ce-Al2O3 catalyst with rate-determining step of NO oxidation
Suhua Yan, Xinping Wang*, Wenchen Wang, Zequn Liu, Jiahao Niu

State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian116024, Liaoning, China


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Abstract Ce-Al2O3 catalysts prepared by co-precipitation are investigated both in NO oxidation by O2 and in selective catalytic reduction of NO by C2H2 (C2H2-SCR). It is found that C2H2-SCR is initiated and controlled by NO oxidation to NO2 over Al2O3. Ce loading on Al2O3 is almost inactive for NO oxidation below 350 ℃, since NO2 strongly adsorbs on cerium oxide, leading to the active sites being blocked, which was characterized by temperature-programmed desorption of NO and NO2 and Fourier transform infrared spectroscopy after NO+O2 coadsorption over the samples. However, in the case of C2H2-SCR, Ce loading on Al2O3 significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250-450 ℃, since the nitrate species produced by NO2 adsorption is an active intermediate required by C2H2-SCR.
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Suhua Yan
Xinping Wang*
Wenchen Wang
Zequn Liu
Jiahao Niu
KeywordsNOx removal   NO oxidation   nitrate species   Ce-Al2O3   acetylene     
Received: 2011-10-06; published: 2012-05-28
Cite this article:   
Suhua Yan, Xinping Wang*, Wenchen Wang etc .Selective catalytic reduction of NO by C2H2 over Ce-Al2O3 catalyst with rate-determining step of NO oxidation[J]  Journal of Natural Gas , 2012,V21(3): 332-338
URL:  
http://www.jenergchem.org/EN/10.1016/S1003-9953(11)60373-3      或     http://www.jenergchem.org/EN/Y2012/V21/I3/332
 
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