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

Research output: Contribution to journalArticle

Standard

Surface Alloy or Metal–Cation Interaction-The State of Zn Promoting the Active Cu Sites in Methanol Synthesis Catalysts. / Großmann, Dennis; Klementiev, Konstantin; Sinev, Ilya; Grünert, Wolfgang.

In: ChemCatChem, Vol. 9, No. 2, 23.01.2017, p. 365-372.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

RIS

TY - JOUR

T1 - Surface Alloy or Metal–Cation Interaction-The State of Zn Promoting the Active Cu Sites in Methanol Synthesis Catalysts

AU - Großmann, Dennis

AU - Klementiev, Konstantin

AU - Sinev, Ilya

AU - Grünert, Wolfgang

PY - 2017/1/23

Y1 - 2017/1/23

N2 - 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.

AB - 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.

KW - catalysis

KW - metal-substrate interaction

KW - methanol synthesis

KW - model catalysts

KW - XAFS

UR - http://www.scopus.com/inward/record.url?scp=85007223404&partnerID=8YFLogxK

U2 - 10.1002/cctc.201601102

DO - 10.1002/cctc.201601102

M3 - Article

VL - 9

SP - 365

EP - 372

JO - ChemCatChem

T2 - ChemCatChem

JF - ChemCatChem

SN - 1867-3880

IS - 2

ER -