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

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [1];  [1];  [2];  [3]
  1. State Univ. of New York (SUNY), Stony Brook, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. 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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