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Title: IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

Carbon monoxide was applied as probe molecule to compare the surface of a ZnO-containing (Cu/ZnO:Al) and a ZnO-free (Cu/MgO) methanol synthesis catalyst (copper content 70 atomic %) after reduction in hydrogen at 523 K by DRIFT spectroscopy. Nano-structured, mainly metallic copper was detected on the surface of the Cu/MgO catalyst. In contrast, the high energy of the main peak in the spectrum of CO adsorbed on reduced Cu/ZnO:Al (2125 cm -1) proves that metallic copper is largely absent on the surface of this catalyst. The band is assigned to Zn δ+–CO. The presence of not completely reduced Cu δ+–CO species cannot be excluded. The results are interpreted in terms of a partial coverage of the copper nano-particles in the Cu/ZnO:Al catalyst by a thin layer of metastable, defective zinc oxide. Minor contributions in the spectrum at 2090 and 2112 cm -1 due to nano-structured Cu 0–CO and CO adsorbed on highly defective Cu 0, respectively, indicate that the coverage of metallic copper is not complete.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [2]
  1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (Germany). Department of Inorganic Chemistry; Stanford Univ., CA (United States). Department of Chemical Engineering; SLAC National Accelerator Lab., Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis
  2. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (Germany). Department of Inorganic Chemistry
  3. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (Germany). Department of Inorganic Chemistry ; Max Planck Institute for Chemical Energy Conversion, Mulheim (Germany)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Topics in Catalysis
Additional Journal Information:
Journal Volume: 60; Journal Issue: 19-20; Journal ID: ISSN 1022-5528
Publisher:
Springer
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Cu; Methanol synthesis catalyst; CO adsorption; DRIFTS
OSTI Identifier:
1417300