Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals. Part I. Catalytic performance

Hisanori Tanaka, Masatoshi Kuriyama, Yoichi Ishida, Shin ichi Ito, Keiichi Tomishige, Kimio Kunimori

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

In preferential CO oxidation in H2-rich stream (PROX), the additive effect of potassium on Pt catalysts was more remarkable over Al2O3 than over SiO2, ZrO2, Nb2O5 and TiO2. The additive effect of potassium to Pt/Al2O3 was more effective than other alkali metals. Especially, the presence of H2 drastically promoted CO oxidation over Pt/Al2O3 modified with potassium. On the other hand, the suppressing effect of steam on the PROX was more significant over K-Pt/Al2O3 than over Pt/Al2O3, although the PROX activity of K-Pt/Al2O3 was much higher than that of Pt/Al2O3 even under the presence of steam. The different effect of steam addition to the PROX over K-Pt/Al2O3 suggests that the active site can be Pt surface modified with potassium ions.

Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalApplied Catalysis A: General
Volume343
Issue number1-2
DOIs
Publication statusPublished - 2008 Jul 1
Externally publishedYes

Keywords

  • Alkali metal ions
  • Platinum
  • Potassium
  • Preferential CO oxidation
  • Presence of H

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Fingerprint Dive into the research topics of 'Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals. Part I. Catalytic performance'. Together they form a unique fingerprint.

Cite this