Different support effect of M/ZrO2 and M/CeO2 (M = Pd and Pt) catalysts on CO adsorption: A periodic density functional study

Changho Jung, Hideyuki Tsuboi, Michihisa Koyama, Momoji Kubo, Ewa Broclawik, Akira Miyamoto

Research output: Contribution to journalConference articlepeer-review

36 Citations (Scopus)

Abstract

CO adsorption over Pd4 and Pt4 cluster supported by c-ZrO2(1 1 1) and CeO2(1 1 1) catalyst systems was investigated using periodic density functional method in order to clarify the support effect on CO activation. We found that the support increases the CO activation for bridge and three-fold sites but decreases for the atop site. Moreover, it was found that the support changes the site preference for the CO adsorption. Bridge site on both the Pt4/c-ZrO2 and Pt 4/CeO2 show larger CO adsorption energies than those on the other sites while the atop site is energetically preferable on isolated Pt4 cluster. c-ZrO2 supported Pd shows the largest CO activation with large charge transfer from the catalyst to the CO molecule. This reveals that ZrO2 supported Pd can be a good catalyst for CO activation because of its higher probability to the three-fold site CO adsorption. We also found that positively charged M4 clusters on the support keep their strong electron-donating properties and have enough charge density to contribute to the activation of an adsorbed CO molecule by a charge transfer.

Original languageEnglish
Pages (from-to)322-327
Number of pages6
JournalCatalysis Today
Volume111
Issue number3-4
DOIs
Publication statusPublished - 2006 Feb 15

Keywords

  • CO adsorption
  • Density functional theory
  • Precious metal
  • Support effect

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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