Doping effect of precious metal on the activity of CuO-CeO2 catalyst for selective oxidation of CO

Chang Ryul Jung, Arunabha Kundu, Suk Woo Nam, Ho In Lee

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Precious metals (Pt, Pd and Ru)-doped copper oxide-ceria (CuO-CeO2) catalysts were prepared by a combination of conventional co-precipitation and impregnation methods and evaluated for the selective oxidation of carbon monoxide in a hydrogen-rich gas stream. It was found that the doping with the precious metal did not change the crystal structure of the catalyst. The binding energy of copper in the precious metal-doped CuO-CeO2 catalyst shifted to a higher value. This indicates that a part of the copper in the CuO-CeO2 catalyst is phase-separated and there is some possibility of the formation of copper chloride on the surface of the catalyst. The added precious metal inhibited the phase separation of copper. The degree of phase separation depended on the type of precious metal and the amount of precious metal loading. The catalytic activity for selective oxidation of carbon monoxide (CO) was the highest in the case of Pt-doped catalyst due to the strong interaction between doped Pt and CuO-CeO2 catalyst. However, the activity of Pd- or Ru-doped catalyst for selective oxidation of CO was much less because doped Pd and Ru have good activity for hydrogen oxidation.

Original languageEnglish
Pages (from-to)112-120
Number of pages9
JournalApplied Catalysis A: General
Volume331
Issue number1
DOIs
Publication statusPublished - 2007

Keywords

  • Cu-Ce-O solid solution
  • CuO-CeO catalyst
  • Doping effect
  • Precious metal
  • Selective oxidation of carbon monoxide

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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