Structure-reactivity Correlations in the catalytic coupling of ethyne over novel bimetallic Pd/Sn catalysts

AF Lee, CJ Baddeley, C Hardacre, GD Moggridge, RM Ormerod, RM Lambert

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38 Citations (Scopus)

Abstract

The structure, thermal stability, and catalytic behavior of a novel highly dispersed silica-supported Pd/Sn catalyst prepared by an organometallic route have been examined by X-ray photoelectron, X-ray diffraction, and X-ray absorption, fine structure spectroscopies, the latter two measurements being carried outwith an in situ reaction cell. Additional reactor measurements were performed on a more Sn-rich catalyst and on a pure Pd catalyst. Varying the temperature of reduction induced large variations in catalytic performance toward ethyne-coupling reactions. These changes are understandable in terms of the destruction of SnO2-like structures surrounding the Pd core, yielding a skin of metallic Sn which subsequently undergoes intermixing with Pd. The overall thermal and catalytic behavior of these highly dispersed materials accords well with the analogous single-crystal model system.

Original languageEnglish
Pages (from-to)2797-2805
Number of pages9
JournalJournal of Physical Chemistry B
Volume101
Issue number15
Publication statusPublished - 10 Apr 1997

Keywords

  • ACETYLENE
  • X-RAY PHOTOEMISSION
  • THERMAL-DECOMPOSITION
  • SUPPORTED PALLADIUM
  • BENZENE
  • ORGANOMETALLIC CHEMISTRY
  • SN/PT(111) SURFACE ALLOYS
  • SINGLE-CRYSTAL SURFACES
  • PARTICLE-SIZE
  • CONTROLLED HYDROGENOLYSIS

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