Ye Jiang 1, Chengzhen Lai1, Shaojun Liu2, Guitao Liang1, Changzhong Bao1, Weiyun Shi1, Shiyuan Ma1


College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China



Received: July 2, 2018
Revised: November 20, 2018
Accepted: December 10, 2018
Download Citation: ||https://doi.org/10.4209/aaqr.2018.06.0215 


Cite this article:
Jiang, Y., Lai, C., Liu, S., Liang, G., Bao, C., Shi, W. and Ma, S. (2019). Deactivation of Ce-Ti Oxide Catalyst by K3PO4 for the Selective Catalytic Reduction of NO with NH3. Aerosol Air Qual. Res. 19: 422-430. https://doi.org/10.4209/aaqr.2018.06.0215


HIGHLIGHTS

  • K3PO4 deactivated the Ce-Ti oxide seriously.
  • A decrease in oxygen vacancies and surface oxygen species due to the decrease in Ce3+.
  • Degradation of surface Brønsted acidity and reducibility.

ABSTRACT


The effect of K3PO4 on the selective catalytic reduction of NO with NH3 over a Ce-Ti oxide catalyst was investigated using XRD, BET, XPS, NH3-TPD, H2-TPR and activity measurements. The results showed that K3PO4 deactivated the Ce-Ti oxide catalyst seriously. The drop in the amount of Ce3+ was accompanied by a decrease in oxygen vacancies and active surface oxygen species, which was disadvantageous to the SCR reaction over the Ce-Ti oxide catalyst. In addition, a reduction in the Brønsted surface acidity and reducibility was also responsible for the deactivation of the Ce-Ti oxide catalyst by K3PO4.


Keywords: Selective catalytic reduction; NO; NH3; K3PO4; Ce-Ti oxide; Activity.

 



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