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

Povzetek

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

Ključne besede

surface carbonates;in situ characterization;Ni XANES;Ni EXAFS;spectator species;CeO2 nanoshapes;CO2 activation;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UNG - Univerza v Novi Gorici
UDK: 620.1/.2
COBISS: 114743555 Povezava se bo odprla v novem oknu
ISSN: 1944-8252
Št. ogledov: 623
Št. prenosov: 0
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

URN: URN:SI:UNG
Vrsta dela (COBISS): Delo ni kategorizirano
Strani: str. 31862-31878
Letnik: ǂVol. ǂ14
Zvezek: ǂIss. ǂ28
Čas izdaje: 2022
DOI: 10.1021/acsami.2c05221
ID: 15899836