Interaction of hydrogen with Cu-Zn mixed oxide model methanol synthesis catalyst

Alexander A. Khassin*, Hervé Jobic, Georgiy A. Filonenko, Evgeniy V. Dokuchits, Alexander V. Khasin, Tatyana P. Minyukova, Natalia V. Shtertser, Lyudmila M. Plyasova, Tamara M. Yurieva

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

Interaction of hydrogen with model Cu-Zn methanol synthesis catalyst prepared by decomposition of mixed hydroxicarbonate is studied by inelastic neutron scattering, in situ FTIR/MS, and thermal analysis. Reduced (Cu 0.08,Zn0.92)O mixed oxide accumulates 6H/Cu, mainly as hydride, hydroxyl and formate species. The reduction of copper in the (Cu,Zn)O mixed oxide occurs via a reversible redox interaction with H2 and absorption of protons as OH--groups with ν = 3250 cm-1 and δ ≈ 1430-1480 cm-1. Kinetic and thermodynamic parameters of this process are evaluated. The weight loss during the reduction is due to the decomposition of the residual carbonate groups to CO2 via formate intermediates, which occurs in the presence of hydrogen. Exposure of (Cu,Zn)O to air prior to the reduction strongly affects the kinetic parameters of the reduction process.

Original languageEnglish
Pages (from-to)151-160
JournalJournal of Molecular Catalysis A: Chemical
Volume373
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Copper reduction
  • Copper-zinc oxide catalyst
  • Hydrogen absorption
  • In situ FTIR
  • Inelastic neutron scattering

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