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The Influence of Alkali Metals on the Ce-Ti Mixed Oxide Catalyst for the Selective Catalytic Reduction of NOx

  1. Dr. Xuesen Du,
  2. Prof. Xiang Gao*,
  3. Ruiyang Qu,
  4. Peidong Ji,
  5. Prof. Zhongyang Luo,
  6. Prof. Ke-fa Cen

Article first published online: 26 OCT 2012

DOI: 10.1002/cctc.201200316

Issue

ChemCatChem

ChemCatChem

Volume 4, Issue 12, pages 2075–2081, December 2012

Additional Information

How to Cite

Du, X., Gao, X., Qu, R., Ji, P., Luo, Z. and Cen, K.-f. (2012), The Influence of Alkali Metals on the Ce-Ti Mixed Oxide Catalyst for the Selective Catalytic Reduction of NOx. ChemCatChem, 4: 2075–2081. doi: 10.1002/cctc.201200316

Author Information

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang PRC, 310027 (P.R. China), Fax: (+86) 057187951616

*State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang PRC, 310027 (P.R. China), Fax: (+86) 057187951616

Publication History

  1. Issue published online: 28 NOV 2012
  2. Article first published online: 26 OCT 2012
  3. Manuscript Revised: 24 JUL 2012
  4. Manuscript Received: 15 MAY 2012

Funded by

  • National Science Found for Distinguished Young Scholars of China. Grant Number: 51125025
  • Development of China. Grant Number: 2007AA061802
  • Ministry of Education

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Keywords:

  • alkali metals;
  • cerium;
  • density functional calculations;
  • nitrogen oxides;
  • reduction

Abstract

Alkali metals were found to be poisonous to the Ce-Ti oxide catalyst. The NO conversion of the catalyst decreased by more than 80 % at temperatures from 250 to 450 °C with the doping of either 3.71 atom % K or 3.74 atom % Na. A combined experimental and theoretical study was used to reveal the mechanism of the deactivation caused be the alkali metals. The results indicated that the doping of alkali metal atoms on the catalyst surface greatly decreases the surface acidity and reducibility. XPS characterization revealed that the interaction between the alkali atoms and the oxygen atom of cerium oxide inhibits the transformation between Ce3+ and Ce4+, which effects a decrease in the proportion of Ce3+. The theoretical results show that the alkali atoms strongly interact with the cerium oxygen and titanium oxygen, which causes the degradation of reducibility and surface acidity, respectively. This causes a serious deactivation of the Ce-Ti oxide catalyst.

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