Journal
ACS CATALYSIS
Volume 6, Issue 12, Pages 8184-8191Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b02360
Keywords
methane activation; dry re-forming; ceria; nickel; supported catalysts; support effect; XPS; DFT
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Funding
- U.S. Department of Energy (Chemical Sciences Division) [DE-SC0012704]
- U.S. Department of Energy
- MINECO-Spain [CTQ2012-32928, CTQ2015-71823-R]
- CONICET
- Ramon y Cajal Fellowship
- Marie Curie Career Integration Grant [FP7-PEOPLE-2011-CIG]
- Royal Society through the Newton Alumnus scheme
- National Science Foundation [CHE1151846]
- Wyoming NASA EPSCoR (NASA) [NNX13AB13A]
- NASA [476723, NNX13AB13A] Funding Source: Federal RePORTER
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The results of core-level photoemission indicate that Ni-CeO2,(111) surfaces with small or medium coverages of nickel are able to activate methane at 300 K, producing adsorbed CHx and CO (x = 2, 3) groups. Calculations based on density functional theory predict a relatively low activation energy of 0.6-0.7 eV for the cleavage of the first C-H bond in the adsorbed methane molecule. Ni and O centers of ceria work in a cooperative way in the dissociation of the C-H bond at room temperature, where a low Ni loading is crucial for the catalyst activity and stability. The strong electronic perturbations in the Ni nanoparticles produced by the ceria supports of varying natures, such as stoichiometric and reduced, result in a drastic change in their chemical properties toward methane adsorption and dissociation as well as the dry reforming of methane reaction. The coverage of Ni has a drastic effect on the ability of the system to dissociate methane and catalyze the dry re-forming process.
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