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Vol. 26 No. 19 (2014): Vol 26 Issue 19

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Effect of Supports on Stability and Water Tolerance of Co-Beta Based Catalysts in NO-SCR by CH4

https://doi.org/10.14233/ajchem.2014.16379
Jiaqi Chen
Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, P.R. China
Shuwei Chen
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
Ruifeng Li
Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, P.R. China; College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
Jiajun Zheng
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China

Corresponding Author(s) : Jiaqi Chen

jinlchen@126.com

Asian Journal of Chemistry, Vol. 26 No. 19 (2014): Vol 26 Issue 19

Abstract

The effect of supports on Co-Beta based catalysts was investigated by various characterizations and reactivity in the presence (2.5 % H2O) and absence of vapor. As UV-visible, XPS, NO-TPD and NO-IR reported, the BZZ(Beta/ZSM5) and BMZ(Beta/MOR) composite supports boost the dispersion of Co active metal and decreased the BE value of catalyst, with a better acidity and stronger adsorption capacity expressed. Under dry condition, stronger stability on CoH-BZZ upon aged for 140 h was described compared with the one on CoH-Beta and CoH-BMZ. Under wet condition, both CoH-BMZ and CoH-BZZ catalysts exhibited higher catalytic activity, when the maximum NO conversion was 45 % on CoH-BMZ or 37 % on CoH-BZZ compared with 23 % on CoH-Beta. However, they had higher depression of NO conversion than CoH-Beta did in the presence of vapor. The loss of the active sites and the migration of active sites from Co2+ to cobalt oxide lead the deactivation of the catalysts.

Keywords

CoH-BZZ CoH-BMZ NO-SCR Polarization Deactivation mechanism
Chen, J., Chen, S., Li, R., & Zheng, J. (2014). Effect of Supports on Stability and Water Tolerance of Co-Beta Based Catalysts in NO-SCR by CH4. Asian Journal of Chemistry, 26(19), 6370–6378. https://doi.org/10.14233/ajchem.2014.16379
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