Lithium promotion in ethanol oxidative dehydrogenation over Al- modified Ag/Montmorillonite clays

[Display omitted] •Addition of Ag to Montmorillonite promotes direct ethanol dehydrogenation pathway.•Presence of Li increases Ag reducibility on Montmonitrolline and Al13-modified Montmonitrolline.•Ethanol dehydrogenation triggers dispersion of Ag clusters on Montmonitrolline and Al13-modified Mont...

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Bibliographic Details
Published inMolecular catalysis Vol. 483; p. 110717
Main Authors Krutpijit, Chadaporn, Tian, Wei, Jongsomjit, Bunjerd, Pjontek, Dominic, Herrera, José E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2020
Subjects
Acetaldehyde
In situ UV-Vis
Lithium
Montmorillonite
Oxidative dehydrogenation
Silver
Silver
Lithium
Oxidative dehydrogenation
Montmorillonite
In situ UV-Vis
Acetaldehyde
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Summary:[Display omitted] •Addition of Ag to Montmorillonite promotes direct ethanol dehydrogenation pathway.•Presence of Li increases Ag reducibility on Montmonitrolline and Al13-modified Montmonitrolline.•Ethanol dehydrogenation triggers dispersion of Ag clusters on Montmonitrolline and Al13-modified Montmonitrolline.•Lithium increases Ag redispersion during ethanol dehydrogenation. The oxidative dehydrogenation (ODH) of ethanol over Ag and AgLi catalyst anchored on unmodified and modified (aluminated) montmorillonite (MT) clay was studied. The results indicate that AgLi formulations anchored on aluminated MT were effective for acetaldehyde production, while unmodified formulations favored ethylene production. Characterization studies indicate that the catalyst activity is regulated by the crystalline size of the silver clusters and the amount of weak basic sites present in the support. The synergism observed is rationalized in terms of a Ag re-dispersion mechanism probed through operando and in situ UV–vis analysis.
ISSN:2468-8231
2468-8231
DOI:10.1016/j.mcat.2019.110717