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

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DOI: 10.4209/aaqr.2018.06.0215
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Ye Jiang 1, Chenzhen 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 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 the decrease in oxygen vacancies and active surface oxygen species, which were disadvantageous to the SCR reaction over Ce–Ti oxide catalyst. In addition, the degradation of surface Brønsted acidity and reducibility were also responsible for the deactivation of Ce–Ti oxide catalyst by K3PO4.

Keywords

Selective catalytic reduction NO NH3 K3PO4 Ce-Ti oxide Activity


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