Structure of ReO x clusters attached on the Ir metal surface in Ir-ReO x/SiO 2 for the hydrogenolysis reaction

Yasushi Amada, Hideo Watanabe, Masazumi Tamura, Yoshinao Nakagawa, Kazu Okumura, Keiichi Tomishige

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

The structural change of Ir/SiO 2 and Ir-ReO x/SiO 2 during the temperature programmed reduction with H 2 was investigated using in situ Ir L 3-edge and Re L 3-edge quick-scanning X-ray absorption fine structure in the combination of temperature programmed reduction with H 2, XRD, the measurement of CO adsorption, Raman spectroscopy, and X-ray photoelectron spectroscopy. The metal oxide on Ir-ReO x/SiO 2 was much more easily reduced than that on monometallic Ir/SiO 2 and ReO x/SiO 2, which is explained by the interaction between trioxo Re species and the IrO 2 phase. The metal structure of Ir-ReO x/SiO 2 constructed after reduction at 485-595 K is the cuboctahedron Ir metal particles covered with three-dimensional ReO x clusters.

Original languageEnglish
Pages (from-to)23503-23514
Number of pages12
JournalJournal of Physical Chemistry C
Volume116
Issue number44
DOIs
Publication statusPublished - 2012 Nov 8

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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