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Title: Structural and Chemical Evolution of an Inverse CeOx/Cu Catalyst under CO2 Hydrogenation: Tunning Oxide Morphology to Improve Activity and Selectivity

Journal Article · · ACS Catalysis
ORCiD logo [1];  [2];  [3];  [3];  [4]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [7]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. State Univ. of New York (SUNY), Binghamton, NY (United States)
  3. Stony Brook Univ., NY (United States)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. Columbia Univ., New York, NY (United States)
  6. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain)
  7. Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)

Small nanoparticles of ceria deposited on a powder of CuO display a very high selectivity for the production of methanol via CO2 hydrogenation. CeO2/CuO catalysts with ceria loadings of 5%, 20%, and 50% were investigated. Among these, the system with 5% CeOx showed the best catalytic performance at temperatures between 200 and 350 °C. The evolution of this system under reaction conditions was studied using a combination of environmental transmission electron microscopy (E-TEM), in situ X-ray absorption spectroscopy (XAS), and time-resolved X-ray diffraction (TR-XRD). For 5% CeOx/Cu, the in situ studies pointed to a full conversion of CuO into metallic copper, with a complete transformation of Ce4+ into Ce3+. Images from E-TEM showed drastic changes in the morphology of the catalyst when it was exposed to H2, CO2, and CO2/H2 mixtures. Under a CO2/H2 feed, there was a redispersion of the ceria particles that was detected by E-TEM and in situ TR-XRD. Finally, these morphological changes were made possible by the inverse oxide/metal configuration and facilitate the binding and selective conversion of CO2 to methanol.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704; SC0012335; AC02-06CH11357
OSTI ID:
2217092
Report Number(s):
BNL-225004-2023-JAAM
Journal Information:
ACS Catalysis, Vol. 13, Issue 23; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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