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Published on: December 6, 2021
Deactivation by HCl of CeO2-MoO3/TiO2 catalyst for selective catalytic reduction of NO with NH3
Ye Jiang1, Mingyuan Lu1, Shaojun Liu2
1College of Pipeline and Civil Engineering, China University of Petroleum 66 Changjiang West Road Qingdao 266580 P. R. China jiangye@upc.edu.cn +86-532-86981882 +86-532-86981767.
Abstract:
The effect of HCl on a CeO2-MoO3/TiO2 catalyst for the selective catalytic reduction of NO with NH3 was investigated with BET, XRD, NH3-TPD, H2-TPR, XPS and catalytic activity measurements. The results showed that HCl had an inhibiting effect on the activity of the CeO2-MoO3/TiO2 catalyst. The deactivation by HCl of the CeO2-MoO3/TiO2 catalyst could be attributed to pore blockage, weakened interaction among ceria, molybdenum and titania, reduction in surface acidity and degradation of redox ability. The Ce3+/Ce4+ redox cycle was damaged because unreactive Ce3+ in the form of CeCl3 lost the ability to be converted to active Ce4+ in the SCR reaction. In addition, a decrease in the amount of chemisorbed oxygen and the concentrations of surface Ce and Mo was also responsible for the deactivation by HCl of the CeO2-MoO3/TiO2 catalyst.
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