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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

Abstract

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 Znδ+–CO. The presence of not completely reduced Cuδ+–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 Cu0–CO and CO adsorbed on highly defective Cu0, 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:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1417300
Grant/Contract Number:  
AC02-76SF00515
Resource 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
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

Citation Formats

Schumann, Julia, Kröhnert, Jutta, Frei, Elias, Schlögl, Robert, and Trunschke, Annette. IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer. United States: N. p., 2017. Web. doi:10.1007/s11244-017-0850-9.
Schumann, Julia, Kröhnert, Jutta, Frei, Elias, Schlögl, Robert, & Trunschke, Annette. IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer. United States. doi:10.1007/s11244-017-0850-9.
Schumann, Julia, Kröhnert, Jutta, Frei, Elias, Schlögl, Robert, and Trunschke, Annette. Mon . "IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer". United States. doi:10.1007/s11244-017-0850-9. https://www.osti.gov/servlets/purl/1417300.
@article{osti_1417300,
title = {IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer},
author = {Schumann, Julia and Kröhnert, Jutta and Frei, Elias and Schlögl, Robert and Trunschke, Annette},
abstractNote = {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 Znδ+–CO. The presence of not completely reduced Cuδ+–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 Cu0–CO and CO adsorbed on highly defective Cu0, respectively, indicate that the coverage of metallic copper is not complete.},
doi = {10.1007/s11244-017-0850-9},
journal = {Topics in Catalysis},
number = 19-20,
volume = 60,
place = {United States},
year = {2017},
month = {8}
}

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