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Title: CO2 Methanation on Cu-Cluster Decorated Zirconia Supports with Different Morphology: A Combined Experimental In Situ GIXANES/GISAXS, Ex Situ XPS and Theoretical DFT Study

Journal Article · · ACS Catalysis

We report that subnanometer copper tetramer-zirconia catalysts turn out to be highly efficient for CO2 hydrogenation and its conversion to methane. The cluster size and substrate morphology are controlled to optimize the catalytic performance. The two types of zirconia supports investigated are prepared by atomic layer deposition (~ 3 nm thick film) and supersonic cluster beam deposition (nanostructured film, ~ 100 nm thick). The substrate plays a crucial role in determining the activity of the catalyst as well as its cyclability over repeated thermal ramps. A temperature-programmed reaction combined with in situ X-ray characterization reveals the correlation between the evolution in the oxidation state and catalytic activity. Ex situ photoelectron spectroscopy indicates Cu clusters with stronger interactions with the nanostructured film, which can be the cause for the higher activity of this catalyst. Density functional theory calculations based on the Cu4O2 cluster supported on a ZrOx subunit reveal low activation barriers and provide mechanism for CO2 hydrogenation and its conversion to methane. Altogether, the results show a new way to tune the catalytic activity of CO2 hydrogenation catalysts through controlling the morphology of the support at the nanoscale.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); European Union (EU); Horizon 2020 Research and Innovation Programme
Grant/Contract Number:
AC02-06CH11357; SC0001004; KK.01.1.1.01.0003; 810310
OSTI ID:
1864350
Journal Information:
ACS Catalysis, Vol. 11, Issue 10; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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