Tuning the oxidation of carbon monoxide using nanoassembled model catalysts

U. Heiz, A. Sanchez, S. Abbet, W. D. Schneider

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

While the oxidation of CO has long been considered to be structure insensitive, nano-assembled model catalysts consisting of size-selected metal clusters (Au(n), Pt(n), Pd(n), and Rh(n), n = 1-20), supported on thin MgO(100) films, reveal distinct size-effects. When adding a single Pt atom to Pt14, platinum clusters increase their reactivity by a factor of three. Rh20 shows the highest reactivity of all the investigated clusters, oxidizing about 13 CO molecules per cluster at 350 K. While F-centers on MgO films transform Au8 from an inert to an active catalyst, the reactivity of Pd8 is not suppressed when deposited on defect-poor films. These different catalytic properties are rationalized within simple frontier orbital models, whereas for Au8 the reaction mechanism for the low temperature oxidation of CO is elucidated within first-principle calculations.

Original languageEnglish
Pages (from-to)189-200
Number of pages12
JournalChemical Physics
Volume262
Issue number1
DOIs
StatePublished - 1 Dec 2000
Externally publishedYes

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