Preparation and Structural Characterization of ZrO2/CuOx/Cu(111) Inverse Model Catalysts
Journal Article
·
· Journal of Physical Chemistry. C
- State Univ. of New York (SUNY), Stony Brook, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- State Univ. of New York (SUNY), Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
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 Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1617683
- Report Number(s):
- BNL--215909-2020-JAAM
- Journal Information:
- Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 19 Vol. 124; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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