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

Journal article (2013)

Authors

A. A. Khassin Boreskov Institute of Catalysis SB RAS

Hervé Jobic Université de Lyon

G.A. Filonenko Novosibirsk State University, Boreskov Institute of Catalysis SB RAS

Evgeniy V. Dokuchits Boreskov Institute of Catalysis SB RAS, Novosibirsk State University

Alexander V. Khasin Boreskov Institute of Catalysis SB RAS

Tatyana P. Minyukova Boreskov Institute of Catalysis SB RAS, Novosibirsk State University

Natalia V. Shtertser Boreskov Institute of Catalysis SB RAS

Lyudmila M. Plyasova Boreskov Institute of Catalysis SB RAS

T. M. Yurieva Boreskov Institute of Catalysis SB RAS

Affiliation

External organisation

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

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Published Date

2013

Language

English

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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.