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Title: Preparation and Structural Characterization of ZrO2/CuOx/Cu(111) Inverse Model Catalysts

Journal Article · · Journal of Physical Chemistry. C

CO2 hydrogenation to methanol is regarded as a promising reaction to catalytically convert a major greenhouse gas (CO2) into a value-added product (methanol). In the current study, scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) were applied to investigate the growth mode of low coverages (<0.2 ML) of ZrO2 in an inverse ZrO2/CuOx/Cu(111) system, which has the potential to achieve a high selectivity for a direct CO2 to methanol transformation. It was found that the morphology of ZrO2 was strongly affected by the preparation method. The ZrO2/CuOx/Cu(111) model catalyst prepared by the oxidation at 600 K of Zr pre-deposited on Cu(111) exhibited substantial mixing of ZrO2 and CuOx. In contrast, the direct deposition of Zr under an O2 ambient over CuOx/Cu(111) at 600 K produced small ZrO2 islands (10-12 nm in size) with a two-dimensional structure (i.e. only one layer of ZrO2). XPS studies indicate that both preparation methods lead to ZrO2/CuOx/Cu(111) surfaces. The model catalyst prepared by the direct deposition of Zr in O2 was annealed up to 700 K in ultra-high vacuum. Both STM and XPS results suggest no apparent change in ZrO2, while CuOx was reduced at such annealing conditions. The island size of 10-12 nm observed for ZrO2 on Cu(111) is much smaller than island sizes seen for CeO2 (30-50 nm) and ZnO (300-500 nm) on the same substrate, opening the possibility for unique chemical properties

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1617683
Report Number(s):
BNL-215909-2020-JAAM
Journal Information:
Journal of Physical Chemistry. C, Vol. 124, Issue 19; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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