20.500.12556/RUNG-7500
CO[sub]2 activation over nanoshaped CeO[sub]2 decorated with nickel for low-temperature methane dry reforming
Dry reforming of methane (DRM) is a promising way to
convert methane and carbon dioxide into H2 and CO (syngas). CeO2
nanorods, nanocubes, and nanospheres were decorated with 1−4 wt % Ni.
The materials were structurally characterized using TEM and in situ
XANES/EXAFS. The CO2 activation was analyzed by DFT and
temperature-programmed techniques combined with MS-DRIFTS. Synthesized CeO2 morphologies expose {111} and {100} terminating facets,
varying the strength of the CO2 interaction and redox properties, which
influence the CO2 activation. Temperature-programmed CO2 DRIFTS
analysis revealed that under hydrogen-lean conditions mono- and bidentate
carbonates are hydrogenated to formate intermediates, which decompose
to H2O and CO. In excess hydrogen, methane is the preferred reaction
product. The CeO2 cubes favor the formation of a polydentate carbonate
species, which is an inert spectator during DRM at 500 °C. Polydentate covers a considerable fraction of ceria’s surface, resulting in
less-abundant surface sites for CO2 dissociation
surface carbonates
in situ characterization
Ni XANES
Ni EXAFS
spectator species
CeO2 nanoshapes
CO2 activation
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true
false
Angleški jezik
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Delo ni kategorizirano
2022-07-13 08:27:14
2022-07-13 08:31:14
2023-06-09 03:47:46
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17 str.
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[in press] 2022
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NiDoloceno
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114743555
1944-8252
10.1021/acsami.2c05221
URN:SI:UNG:REP:ZRF0YW9F
Univerza v Novi Gorici
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