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Surface Alloy or Metal–Cation Interaction-The State of Zn Promoting the Active Cu Sites in Methanol Synthesis Catalysts

Großmann, Dennis; Klementiev, Konstantin LU ; Sinev, Ilya and Grünert, Wolfgang (2017) In ChemCatChem 9(2). p.365-372
Abstract

Model catalysts containing disordered CuO and ZnO species in the pores of SBA-15 were reduced under different conditions (standard: H2, 513 K; severe: CO/H2, 673 K), studied by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) including operando work and used as catalysts for methanol synthesis at pressures up to 8 bar, where they were comparable with a commercial reference in terms of reaction rates related to Cu surface area. Severe reduction caused significant activation of the Cu sites beyond the sizeable level achieved already after standard reduction. In XRD, which failed to detect most of the active components, owing to small particle sizes, weak indications of alloy formation were found after... (More)

Model catalysts containing disordered CuO and ZnO species in the pores of SBA-15 were reduced under different conditions (standard: H2, 513 K; severe: CO/H2, 673 K), studied by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) including operando work and used as catalysts for methanol synthesis at pressures up to 8 bar, where they were comparable with a commercial reference in terms of reaction rates related to Cu surface area. Severe reduction caused significant activation of the Cu sites beyond the sizeable level achieved already after standard reduction. In XRD, which failed to detect most of the active components, owing to small particle sizes, weak indications of alloy formation were found after severe reduction. XAFS, which averages over all species present, showed the interaction of Cu with zinc ions to increase by severe reduction, while formation of Zn0 was below detection limit. On this basis, the promoting interaction of Zn to Cu was ascribed to an interaction of zinc cations with Cu0.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
catalysis, metal-substrate interaction, methanol synthesis, model catalysts, XAFS
in
ChemCatChem
volume
9
issue
2
pages
8 pages
publisher
John Wiley & Sons
external identifiers
  • scopus:85007223404
  • wos:000395798300020
ISSN
1867-3880
DOI
10.1002/cctc.201601102
language
English
LU publication?
yes
id
71860b1b-bd1f-4300-8497-9b350e9dbec6
date added to LUP
2017-02-15 07:55:38
date last changed
2018-01-07 11:49:52
@article{71860b1b-bd1f-4300-8497-9b350e9dbec6,
  abstract     = {<p>Model catalysts containing disordered CuO and ZnO species in the pores of SBA-15 were reduced under different conditions (standard: H<sub>2</sub>, 513 K; severe: CO/H<sub>2</sub>, 673 K), studied by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) including operando work and used as catalysts for methanol synthesis at pressures up to 8 bar, where they were comparable with a commercial reference in terms of reaction rates related to Cu surface area. Severe reduction caused significant activation of the Cu sites beyond the sizeable level achieved already after standard reduction. In XRD, which failed to detect most of the active components, owing to small particle sizes, weak indications of alloy formation were found after severe reduction. XAFS, which averages over all species present, showed the interaction of Cu with zinc ions to increase by severe reduction, while formation of Zn<sup>0</sup> was below detection limit. On this basis, the promoting interaction of Zn to Cu was ascribed to an interaction of zinc cations with Cu<sup>0</sup>.</p>},
  author       = {Großmann, Dennis and Klementiev, Konstantin and Sinev, Ilya and Grünert, Wolfgang},
  issn         = {1867-3880},
  keyword      = {catalysis,metal-substrate interaction,methanol synthesis,model catalysts,XAFS},
  language     = {eng},
  month        = {01},
  number       = {2},
  pages        = {365--372},
  publisher    = {John Wiley & Sons},
  series       = {ChemCatChem},
  title        = {Surface Alloy or Metal–Cation Interaction-The State of Zn Promoting the Active Cu Sites in Methanol Synthesis Catalysts},
  url          = {http://dx.doi.org/10.1002/cctc.201601102},
  volume       = {9},
  year         = {2017},
}