| Title: | CO[sub]2 activation over nanoshaped CeO[sub]2 decorated with nickel for low-temperature methane dry reforming |
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| Authors: | ID Lorber, Kristijan, KI (Author)
ID Zavašnik, Janez, IJS (Author)
ID Arčon, Iztok, UNG (Author)
ID Huš, Matej, KI (Author)
ID Teržan, Janvit, KI (Author)
ID Likozar, Blaž, KI (Author)
ID Djinović, Petar, KI (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | 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 |
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| Keywords: | surface carbonates, in situ characterization, Ni XANES, Ni EXAFS, spectator species, CeO2 nanoshapes, CO2 activation |
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| Number of pages: | 17 str. |
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| Numbering: | 1 |
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| PID: | 20.500.12556/RUNG-7500 |
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| COBISS.SI-ID: | 114743555 |
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| ISSN on article: | 1944-8252 |
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| DOI: | 10.1021/acsami.2c05221 |
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| NUK URN: | URN:SI:UNG:REP:ZRF0YW9F |
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| Publication date in RUNG: | 13.07.2022 |
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| Views: | 1447 |
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| Downloads: | 0 |
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