期刊
FUEL PROCESSING TECHNOLOGY
卷 154, 期 -, 页码 235-242出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2016.08.038
关键词
Mn/FiO(2) catalyst; SCR; Zn; Nb; Deactivation; Resistance
资金
- National Natural Science Foundation of China [21546014]
- Natural Science Foundation of Shanghai, China [14ZR1417800]
Heavy metals (such as Zn and Pb) have a deactivation effect on the catalyst for selective catalytic reduction of NO with NH3. In this study, it was found that the modification of Mn/TiO2 catalyst by Nb could greatly enhance its Zn resistance. From the characterization results of BET, XRD, H-2-TPR, NH3-TPD, it may be concluded that the introduction of Nb into Mn/TiO2 catalyst would lead to its lower crystallinity, more acid sites and higher concentrations of Mn4+ and surface chemisorbed oxygen. The results of in situ DRIFT study reveal that the NH3-SCR reactions over Mn/TiO2 and Mn-Nb/TiO2 all obey both the Langmuir-Hinshelwood mechanism and the Eley-Rideal mechanism, and the doping of Nb on Mn/TiO2 catalyst could promote the adsorption of NH3 and NOx species on it. All these features make a contribution to the high SCR activity and good Zn resistance of Mn-Nb/TiO2 catalyst. (C) 2016 Elsevier B.V. All rights reserved.
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