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Title:CO[sub]2 activation over nanoshaped CeO[sub]2 decorated with nickel for low-temperature methane dry reforming
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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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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
Keywords:surface carbonates, in situ characterization, Ni XANES, Ni EXAFS, spectator species, CeO2 nanoshapes, CO2 activation
Number of pages:17 str.
Numbering:1
PID:20.500.12556/RUNG-7500 New window
COBISS.SI-ID:114743555 New window
ISSN on article:1944-8252
DOI:10.1021/acsami.2c05221 New window
NUK URN:URN:SI:UNG:REP:ZRF0YW9F
Publication date in RUNG:13.07.2022
Views:1418
Downloads:0
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Record is a part of a journal

Title:ACS applied materials & interfaces
Shortened title:ACS Appl. Mater. Interfaces

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