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CO2 Adsorption and Hydrogenation on Inverse InOx/Cu(111) Catalysts: Active Role of the Oxide–Metal Interface

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [1];  [3];  [2];  [2];  [4]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Stony Brook Univ., NY (United States)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
+ Show Author Affiliations
The direct conversion of carbon dioxide (CO2) into methanol via hydrogenation is essential for industrial applications. Recent studies on catalysts that contain an inverse oxide/metal configuration have shown very good catalytic performance for the CO2 hydrogenation to methanol process. Here, in this study, we investigated the behavior of indium oxide-Cu(111) interfaces under pure CO2 and CO2/H2 mixtures using synchrotron-based ambient-pressure X-ray photoelectron spectroscopy (AP-XPS). Initially, a single layer of copper oxide (CuxO) was grown on the Cu(111) surface by controlled oxidation. On this surface, indium was deposited at room temperature. Oxygen atoms transferred from CuxO/Cu(111) to the indium metal upon deposition, forming In-O-Cu bonds and active interfaces. Although Cu(111) is not very active for the binding and activation of CO2, the formed InOx-Cu(111) interfaces had no problem adsorbing and dissociating the molecule at room temperature. Reaction of CO2 with H2 on InOx-Cu(111) yielded surface-bound H3CO, CO2δ−, CO3, and CHx species that are typical intermediates in the production of methanol and other oxygenates. The InOx-Cu(111) interface underwent dynamic chemical changes under reaction conditions, forming In-Cu alloys at low indium coverages (< 0.05 monolayer), while at higher indium coverages a mixture of an In-Cu and InOx was detected in XPS. These findings indicate that InOx/In-Cu interfaces can play a key role in processes aimed at the trapping and valorization of CO2.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704
OSTI ID:
2570558
Report Number(s):
BNL--228357-2025-JAAM
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 25 Vol. 17; ISSN 1944-8244; ISSN 1944-8252
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
Indium oxide
carbon dioxide
copper
methanol