In Situ Investigation of Methane Dry Reforming on Metal/Ceria(111) Surfaces: Metal–Support Interactions and C-H Bond Activation at Low Temperature
Authors/Creators
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1.
Brookhaven National Laboratory
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2.
Institute of Physics Rosario
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3.
Central University of Venezuela
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4.
Tyndall National Institute
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5.
Charles University
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6.
Instituto de Catálisis y Petroleoquímica
Description
Studies with a series of metal/ceria(111) (metal=Co,Ni, Cu; ceria=CeO2) surfaces indicate that metal–oxide
interactions can play a very important role for the activation of methane and its reforming with CO2 at relatively low temperatures (600–700 K). Among the systems examined, Co/CeO2(111) exhibits the best performance and
Cu/CeO2(111) has negligible activity. Experiments using ambient pressure X-ray photoelectron spectroscopy indicate that methane dissociates on Co/CeO2(111) at temperatures as low as 300 K—generating CHx and COx species on the catalyst surface. The results of density functional calculations show a reduction in the methane activation barrier from 1.07 eV on Co(0001) to 0.87 eV on Co2+/CeO2(111), and to only 0.05 eV on Co0/CeO2@x(111). At 700 K, under methane dry reforming conditions, CO2 dissociates on the oxide surface and a catalytic cycle is established without coke deposition. A significant part of the CHx formed on the Co0/CeO2@x(111) catalyst recombines to yield ethane or ethylene.
Files
2017-DRM-NiCoCu_pub-OK.pdf
Files
(11.4 MB)
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