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Comparison of kinetics and reaction pathways for hydrodeoxygenation of C3 alcohols on Pt/Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
55407 47052 2012 7 PDF Available
Title
Comparison of kinetics and reaction pathways for hydrodeoxygenation of C3 alcohols on Pt/Al2O3
Abstract

The catalytic hydrodeoxygenation of C3 alcohols (1- and 2-propanol, 1,2- and 1,3-propanediol, and glycerol) on Pt/Al2O3 has been mechanistically explored in the aqueous phase. Dehydrogenation on Pt and dehydration on alumina are the main elementary reaction pathways. In water, carbon–carbon bond cleavage for alcohols with terminal hydroxyl groups occurs via decarbonylation of aldehydes (generated by dehydrogenation of alcohols) and decarboxylation of acids, the latter being formed by disproportionation from aldehydes. The presence of water as solvent suppresses the dehydration for mono-alcohols mainly via blocking of Lewis acid sites by water. Dehydration is still the dominating primary reaction for 1,3-propanediol and glycerol, as the higher number of hydroxyl groups weakens the C–O bond strength. The overall reactivity of C3 alcohols decreases in the order of 1,3-propanediol ≈ glycerol > 1,2-propanediol ≈ 1-propanol.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (91 K)Download as PowerPoint slideHighlights► Two competing reaction pathways (decarboxylation/decarbonylation) for C-C bond cleavage exist. ► C-O bond cleavage occurs through acid catalyzed water elimination. ► Direct hydrogenolysis of C-C and C-O bonds does not occur. ► Reactivity sequence follows k (1,3-propanediol) ≈ k (glycerol) > k (1,2-propanediol) ≈ k (1-propanol).

Keywords
Aqueous phase; Decarbonylation; Decarboxylation; Disproportionation; Hydrodeoxygenation of alcohols; Glycerol
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Comparison of kinetics and reaction pathways for hydrodeoxygenation of C3 alcohols on Pt/Al2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 183, Issue 1, 20 March 2012, Pages 3–9
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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