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Catalytic CO2 valorization into CH4 on Ni-based ceria-zirconia. Reaction mechanism by operando IR spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
54637 47017 2013 7 PDF Available
Title
Catalytic CO2 valorization into CH4 on Ni-based ceria-zirconia. Reaction mechanism by operando IR spectroscopy
Abstract

•Ceria-zirconia supports plays a key role in the CO2 methanation.•CO2 is actived into formates on the support.•The metal-support interaction is crucial to the catalytic stability.•The mechanism on Ni-Ceria-Zirconia does not go through the formation of CO.

Despite several studies, the use of CO2 as a chemical reactant is currently limited to a few processes. With the aim to formulate an efficient catalyst for CO2 conversion into methane, nickel was selected, being well known to be active for the catalytic COx methanation. Ceria-zirconia mixed oxide was chosen as a support because of its properties to activate CO2. Yields close to those predicted by thermodynamic were obtained with weak deactivation even after 90 h on stream. Interactions between Ni and the ceria-zirconia support seem to be a key parameter for the methanation reaction. The use of IR operando spectroscopy revealed that the main mechanism for CO2 methanation does not require CO as reaction intermediate. The better activity observed compared to Ni-silica can be explained by the importance of weak basic sites the adsorption of CO2.

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Keywords
CO2; Methanation; Ceria-zirconia; operando FTIR
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Catalytic CO2 valorization into CH4 on Ni-based ceria-zirconia. Reaction mechanism by operando IR spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 215, 15 October 2013, Pages 201–207
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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