Catalytic reduction of NO by CO over NiO/CeO2 catalyst in stoichiometric NO/CO and NO/CO/O2 reaction

Yong Wang, Aimin Zhu, Yuzhuo Zhang, Chak Tong AU, Xuefeng Yang, Chuan Shi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)

Abstract

A new catalyst composed of nickel oxide and cerium oxide was studied with respect to its activity for NO reduction by CO under stoichiometric conditions in the absence as well as the presence of oxygen. Activity measurements of the NO/CO reaction were also conducted over NiO/γ-Al2O3, NiO/TiO2, and NiO/CeO2 catalysts for comparison purposes. The results showed that the conversion of NO and CO are dependent on the nature of supports, and the catalysts decreased in activity in the order of NiO/CeO2 > NiO/γ-Al2O3 > NiO/TiO2. Three kinds of CeO2 were prepared and used as support for NiO. They are the CeO2 prepared by (i) homogeneous precipitation (HP), (ii) precipitation (PC), and (iii) direct decomposition (DP) method. We found that the NiO/CeO2(HP) catalyst was the most active, and complete conversion of NO and CO occurred at 210 °C at a space velocity of 120,000 h-1. Based on the results of surface analysis, a reaction model for NO/CO interaction over NiO/CeO2 has been proposed: (i) CO reduces surface oxygen to create vacant sites; (ii) on the vacant sites, NO dissociates to produce N2; and (iii) the oxygen originated from NO dissociation is removed by CO.

Original languageEnglish
Pages (from-to)141-149
Number of pages9
JournalApplied Catalysis B: Environmental
Volume81
Issue number1-2
DOIs
Publication statusPublished - 30 May 2008

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • CO
  • NiO/CeO catalyst
  • NO reduction

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