Ethanol to Butanol Conversion over Bifunctional Zeotype Catalysts Containing Palladium and Zirconium: Fid-Bau Portal

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Ethanol to Butanol Conversion over Bifunctional Zeotype Catalysts Containing Palladium and Zirconium

Kots, P. A. / Zabilska, A. V. / Grigor’ev, Yu. V. / Ivanova, I. I.

Abstract A study of the kinetics of ethanol conversion in the presence of Zr-containing zeolites BEA doped with palladium particles has revealed the order of formation of the main reaction products. It has been shown that the primary processes are ethanol dehydrogenation to acetaldehyde on Pd sites and ethanol dehydration to diethyl ether on the acid sites of the catalyst. After that, acetaldehyde undergoes the aldol–croton condensation reaction to form crotonal, which is hydrogenated to butanol on the metal sites. Butanol, in turn, is dehydrated into butenes, which undergo hydrogenation to butane. The presence of hydrogen in the gas phase leads to the displacement of ethanol from the metal surface and prevents the formation of surface carbonates and acetates. It has been found that hydrogen significantly accelerates ethanol dehydration owing to a decrease in the activation energy, which can be attributed to hydrogen spillover to the zeolite. The addition of water inhibits all acid-catalyzed reactions owing to competitive adsorption on acid sites and thereby decreases the butanol yield and the ethanol conversion.

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Ethanol to Butanol Conversion over Bifunctional Zeotype Catalysts Containing Palladium and Zirconium

Kots, P. A. / Zabilska, A. V. / Grigor’ev, Yu. V. / Ivanova, I. I.

Abstract A study of the kinetics of ethanol conversion in the presence of Zr-containing zeolites BEA doped with palladium particles has revealed the order of formation of the main reaction products. It has been shown that the primary processes are ethanol dehydrogenation to acetaldehyde on Pd sites and ethanol dehydration to diethyl ether on the acid sites of the catalyst. After that, acetaldehyde undergoes the aldol–croton condensation reaction to form crotonal, which is hydrogenated to butanol on the metal sites. Butanol, in turn, is dehydrated into butenes, which undergo hydrogenation to butane. The presence of hydrogen in the gas phase leads to the displacement of ethanol from the metal surface and prevents the formation of surface carbonates and acetates. It has been found that hydrogen significantly accelerates ethanol dehydration owing to a decrease in the activation energy, which can be attributed to hydrogen spillover to the zeolite. The addition of water inhibits all acid-catalyzed reactions owing to competitive adsorption on acid sites and thereby decreases the butanol yield and the ethanol conversion.

Ethanol to Butanol Conversion over Bifunctional Zeotype Catalysts Containing Palladium and Zirconium

Kots, P. A. / Zabilska, A. V. / Grigor’ev, Yu. V. / Ivanova, I. I.

Abstract A study of the kinetics of ethanol conversion in the presence of Zr-containing zeolites BEA doped with palladium particles has revealed the order of formation of the main reaction products. It has been shown that the primary processes are ethanol dehydrogenation to acetaldehyde on Pd sites and ethanol dehydration to diethyl ether on the acid sites of the catalyst. After that, acetaldehyde undergoes the aldol–croton condensation reaction to form crotonal, which is hydrogenated to butanol on the metal sites. Butanol, in turn, is dehydrated into butenes, which undergo hydrogenation to butane. The presence of hydrogen in the gas phase leads to the displacement of ethanol from the metal surface and prevents the formation of surface carbonates and acetates. It has been found that hydrogen significantly accelerates ethanol dehydration owing to a decrease in the activation energy, which can be attributed to hydrogen spillover to the zeolite. The addition of water inhibits all acid-catalyzed reactions owing to competitive adsorption on acid sites and thereby decreases the butanol yield and the ethanol conversion.

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Title:

Ethanol to Butanol Conversion over Bifunctional Zeotype Catalysts Containing Palladium and Zirconium

Contributors:

Kots, P. A. (author) / Zabilska, A. V. (author) / Grigor’ev, Yu. V. (author) / Ivanova, I. I. (author)

Published in:

Petroleum Chemistry ; 59 ; 925-934

Publication date:

2019-08-01

Size:

10 pages

ISSN:

1555-6239 , 0965-5441

DOI:

https://doi.org/10.1134/S0965544119080097

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

ethanol , Guerbet–Markovnikov reaction , butanol , IR spectroscopy , spillover , bifunctional catalysis Chemistry , Industrial Chemistry/Chemical Engineering

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