Journal
COMPTES RENDUS CHIMIE
Volume 18, Issue 3, Pages 345-350Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2014.07.002
Keywords
Mechanism; Thermodynamics; Ethanol; Guerbet alcohols
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The combination of kinetic and thermodynamic analyses can provide an in-depth knowledge of the crucial steps of catalyzed reactions. Earlier examples are recalled to stress how a reaction mechanism can be supported or rejected based on trivial reactant and product concentration analyses. The method is then applied to the important reaction of alcohol condensation, the so-called Guerbet reaction, which enables converting ethanol, a renewable feedstock, into higher alcohols. Important conclusions regarding the design of ethanol condensation processes can be drawn, as the main reaction mechanism occurring at high temperatures (ca. 350-420 degrees C) appears to be different from that proposed at low temperatures (< 250 degrees C). In the former case, the pathway involving acetaldehyde is negligible, and therefore a multi-step process based on ethanol dehydrogenation followed by acetaldehyde self-aldolization would be irrelevant. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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