Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 356, Issue -, Pages 121-127Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2012.01.004
Keywords
NOX; SCR; V2O5; CeO2; CNT
Categories
Funding
- Environmentally Sustainable Management of Medical Wastes in China [C/V/S/10/251]
- National Natural Foundation of Zhejiang Province, China [Z4080070]
- Foundation of Science and Technology Bureau of Zhejiang Province, China [2008C21057, 2009C34003]
- Zhejiang Province Environmental Protection Science Research Plan of China [2011B14]
- Fundamental Research Funds for the Central Universities [2010QNA4005]
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A series of V2O5-CeOX/TiO2-carbon nanotube composites were prepared by sol-gel method and their catalytic activity for the reduction of NOX with NH3 was compared. V2O5CeOX/TiO2 (Ce/V= 9) achieved a NOX removal efficiency of 92% and 98% at 200 degrees C and 250 degrees C, respectively. SEM, XRD, XPS, BET, Raman, TPD and TPR were employed to probe the promotional effect of CeOX. The appearance of Ce3+ is found to increase chemisorbed oxygen thus facilitates the catalytic reduction of NOX. The poisoning effect caused by SO2 was found to depend on temperatures and gas velocity strongly. Moreover, the existence of excess oxygen was found to be essential (2% of O-2 compared to 500 ppm NOX) to keep high SCR activity. (C) 2012 Elsevier B.V. All rights reserved.
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