Higher alcohols synthesis from syngas and ethanol over KCoMoS2-catalysts supported on graphene nanosheets

The comparative study of the catalytic behavior of K-modified CoMoS 2 -catalysts supported on Al 2 O 3 , carbon covered alumina (CCA) and graphene coated alumina (GCA containing 0.4, 1.2, and 1.7% of graphene) in synthesis gas and ethanol conversion (separately) to higher alcohols (HAS) and other ox...

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Bibliographic Details
Published in:Chemical engineering communications 2023-09, Vol.210 (9), p.1508-1527
Main Authors: Osman, M. E., Dipheko, T. D., Maximov, V. V., Sheshko, T. F., Markova, E. B, Trusova, E. A., Cherednichenko, A.G., Kogan, V. M.
Format: Article
Language:English
Subjects:
Adsorption
Alcohols
Alumina
Aluminum oxide
Carbon
Carbon coating alumina
Catalysts
Comparative studies
Conversion
Dehydrogenation
Ethanol
ethanol conversion
Graphene
graphene nanosheets
higher alcohols synthesis
KCoMoS2 catalysts
Nanosheets
syngas conversion
Synthesis gas
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Summary:The comparative study of the catalytic behavior of K-modified CoMoS 2 -catalysts supported on Al 2 O 3 , carbon covered alumina (CCA) and graphene coated alumina (GCA containing 0.4, 1.2, and 1.7% of graphene) in synthesis gas and ethanol conversion (separately) to higher alcohols (HAS) and other oxygenates has been carried out. The supports and catalysts were characterized by N 2 adsorption-desorption isotherms, pyridine adsorption, SEM, EDX, and TEM. In HAS from syngas, the catalyst supported on GCA materials showed better catalytic performances than the catalysts supported on alumina and carbon coated alumina (Cat-GCA > Cat-CCA > Cat-Al 2 O 3 ). The spectroscopic results have established that the homogenous uniform coating of alumina by graphene nanosheets follows the order: GCA1 (1.7%) > GCA2 (1.2%) > GCA3 (0.4%). The yield of ethanol has a positive correlation with graphene wt. % in GCA. In ethanol conversion, graphene attenuate the interaction of the support/active site KCoMoS 2 and with it its selectivity toward dehydrogenation/condensation reactions. The GCA1 supported catalyst exhibits low activity for the water-gas shift (WGS) reaction compared to its counterpart. Explanations of the observed phenomena have been suggested.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986445.2022.2116323