Kristijan Lorber (Author), Janez Zavašnik (Author), Iztok Arčon (Author), Matej Huš (Author), Janvit Teržan (Author), Blaž Likozar (Author), Petar Djinović (Author)

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;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 620.1/.2
COBISS: 114743555 Link will open in a new window
ISSN: 1944-8252
Views: 623
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Other data

URN: URN:SI:UNG
Type (COBISS): Not categorized
Pages: str. 31862-31878
Volume: ǂVol. ǂ14
Issue: ǂIss. ǂ28
Chronology: 2022
DOI: 10.1021/acsami.2c05221
ID: 15899836