Time-resolved XANES investigation of CuO/ZnO in the oxidative methanol reforming reaction

T. L. Reitz, K. F. Czaplewski, J. C. Lang, K. E. Popp, H. H. Kung

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

CuO/ZnO catalysts were examined by time-resolved X-ray absorption spectroscopy during oxidative reforming of methanol. Under low oxygen conversion conditions, Cu2+ was the dominant copper species and combustion of methanol to carbon dioxide and water was the primary reaction. After complete oxygen conversion, Cu2+ was reduced to Cu0 while the principal activity of the catalyst shifted to steam reforming, where the dominant product was hydrogen. Cu+ was observed as a transient species in the reduction of Cu2+ to Cu0 and no activity was attributed to it. Increasing the oxygen partial pressure increased the rate of reduction of Cu2+. This observation was attributed to a heating effect associated with an enhancement of the combustion rate. Additional experiments showed that the catalyst could recover its original activity after a reduction/oxidation cycle.

Original languageEnglish
Pages (from-to)193-201
Number of pages9
JournalJournal of Catalysis
Volume199
Issue number2
DOIs
Publication statusPublished - Jan 1 2001

Keywords

  • Autothermal
  • CuO/ZnO/AlO
  • Methanol
  • Oxidative reforming
  • XANES

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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