Ethanol dehydrogenation over (K)(Co)MoS2catalysts supported on activated carbon: Effect of active phase composition

Ethanol dehydrogenation over (K)(Co)MoS2catalysts supported on activated carbon: Effect of active phase composition Full article

Journal

South African Journal of Chemical Engineering
ISSN: 2589-0344 , E-ISSN: 1026-9185

Output data

Year: 2022, Volume: 42, Pages: 290-305 Pages count : 16 DOI: 10.1016/j.sajce.2022.09.004

Authors

Dipheko Tshepo D. ^1,2 , Maximov Vladimir V. ¹ , Permyakov Evgeny A. ¹ , Osman Mohamed Ezeldin ^1,2 , Cherednichenko Alexander G. ² , Kogan Victor M. ¹

Affiliations

1	N.D. Zelinsky Institute of Organic Chemistry RAS, Moscow 119991, Russia
2	Peoples’ Friendship University of Russia, Moscow 117198, Russia

The conversion of ethanol to synthesize various oxygenated hydrocarbons was studied over monometallic-, bimetallic-, and trimetallic-(K)(Co)MoS2-based catalysts supported on activated carbon. The catalysts were synthesized using the incipient wetness impregnation method and sulfidized with H2S. The catalysts were characterized by the following techniques: N2 adsorption-desorption, UV spectroscopy of pyridine-adsorption; scanning electron microscopy (SEM); SEM energy dispersive X-ray (EDX). SEM/EDX results revealed that the active metals formed a uniform phase. Synthesized catalysts were tested in a fixed-bed tubular reactor. It was established that the addition of K and Co significantly altered the physical-chemical properties, activity and selectivity of sulfide catalysts. The addition of K decreased the catalytic activity (i.e., over KMoS2/C and KCoMoS2/C) relative to the reference MoS2/C and CoMoS2/C samples. The incorporation of a promoter atom, Co, and an alkali metal, K, inhibited ethanol dehydration (into ethene) and intermolecular dehydration (into diethyl ether). K incorporation led to the formation of active sites for higher alcohol synthesis (HAS) and other oxygenates, namely (aldol-) condensation and coupling processes, and increased the ratio of liquids to hydrocarbons. Ethanol was transformed into ethyl acetate, ethyl acetoacetate, acetaldehyde, butonal-1, propanol-1, and short-chain hydrocarbons. The acidity of the catalysts did not have a direct influence on conversion. The obtained results led us to conclude that product yields are highly dependent on the active phase composition, with ethyl acetate being the most preferred product.

Dipheko T.D. , Maximov V.V. , Permyakov E.A. , Osman M.E. , Cherednichenko A.G. , Kogan V.M.
Ethanol dehydrogenation over (K)(Co)MoS2catalysts supported on activated carbon: Effect of active phase composition
South African Journal of Chemical Engineering. 2022. V.42. P.290-305. DOI: 10.1016/j.sajce.2022.09.004 Scopus OpenAlex

Scopus:	2-s2.0-85138536751
OpenAlex:	W4295950934

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