Mechanism of Low Pressure Plasma-Assisted CO2 Hydrogenation Over Ni-USY by Microsecond Time-resolved FTIR Spectroscopy

Zeolite H-USY doped with nickel (14% wt.) was used as a catalyst in the plasma-assisted CO 2 hydrogenation under partial vacuum. CO was found to be the main product of the reaction and it is generated by plasma-assisted CO 2 dissociation in the gas phase. The CO 2 molecules vibrationally excited by...

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Bibliographic Details
Published in:Topics in catalysis 2017-12, Vol.60 (19-20), p.1709-1721
Main Authors: Azzolina-Jury, Federico, Thibault-Starzyk, Frédéric
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbonates
Carbonyls
Catalysis
Catalysts
Characterization and Evaluation of Materials
Chemical Sciences
Chemistry
Chemistry and Materials Science
Formates
Fourier transforms
Hydrogenation
Industrial Chemistry/Chemical Engineering
Infrared spectroscopy
Low pressure
Methane
Nickel
Original Paper
Pharmacy
Physical Chemistry
Plasma
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Summary:Zeolite H-USY doped with nickel (14% wt.) was used as a catalyst in the plasma-assisted CO 2 hydrogenation under partial vacuum. CO was found to be the main product of the reaction and it is generated by plasma-assisted CO 2 dissociation in the gas phase. The CO 2 molecules vibrationally excited by plasma are also adsorbed on metallic nickel as formates which are further transformed into linear carbonyls. These species are then hydrogenated to form methane. Since the catalyst presents a low basic behavior, methane is produced from hydrogenation of linear carbonyls on nickel surface rather than from carbonates species. A detailed mechanism for this reaction assisted by plasma (glow discharge) is proposed using Operando time-resolved FTIR spectroscopic data.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-017-0849-2