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Deactivation of Ce-Ti Oxide Catalyst by K3PO4 for the Selective Catalytic Reduction of NO with NH3

Category: Control Techniques and Strategy

Volume: 19 | Issue: 2 | Pages: 422-430
DOI: 10.4209/aaqr.2018.06.0215
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Ye Jiang 1, Chengzhen Lai1, Shaojun Liu2, Guitao Liang1, Changzhong Bao1, Weiyun Shi1, Shiyuan Ma1

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

Highlights

K3PO4 deactivated the Ce-Ti oxide seriously.
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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