CO2 Methanation over Rh/CeO2 Studied with Infrared Modulation Excitation Spectroscopy and Phase Sensitive Detection

Hemmingsson, Felix,1992Chalmers tekniska högskola,Chalmers University of Technology (författare)

Methane is a well-established fuel molecule whose production from CO2 through methanation garners increasing interest as an energy storage solution. While often produced with Ni based catalysts, other metals are of interest thanks to higher robustness and activity-selectivity numbers. The Rh/CeO2 catalyst has shown appreciable properties for CO2 methanation and its structural dynamics has been studied in situ. However, the reaction pathway is unknown. Here, we present infrared modulation excitation spectroscopy measurements with phase sensitive detection of a Rh/CeO2 catalyst adsorbate composition during H2 pulsing (0–2 vol.%) to a constant CO2 (0.5 vol.%) feed. Various carbonyl (CO) and carbonate (b-CO3 /p-CO3 ) ad-species clearly respond to the hydrogen stimulus, making them potential reaction intermediates. The different CO ad-species are likely intermediates for product CO and CH4 but their individual contributions to the respective formations are not unambiguously ascertained. As for the carbonate dynamics, it might be linked to the reduction/oxidation of the CeO2 surface upon H2 pulsing. Formate (HCOO) ad-species are clearly visible but appear to be, if not spectators, linked to slow side reactions possibly also affected by CeO2 redox processes.

NATURVETENSKAP Kemi Oorganisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Inorganic Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Kemiteknik Annan kemiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Other Chemical Engineering hsv//eng
carbon cycling
phase sensitive detection
modulation excitation spectroscopy
surface intermediates
catalytic mechanisms
supported catalyst
hydrogenation
diffuse reflectance
CO2 utilisation

Schaefer, Andreas,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)andscha (författare)
Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund (författare)
Carlsson, Per-Anders,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)perc (författare)
Chalmers tekniska högskola (creator_code:org_t)

Av författaren/redakt...: Hemmingsson, Fel ...; Schaefer, Andrea ...; Skoglundh, Magnu ...; Carlsson, Per-An ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Annan kemiteknik

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