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Hydrocarbon fuel synthesis from sorbitol over bifunctional catalysts: Association of tungstated titania with platinum, palladium or iridium

Paper ID Volume ID Publish Year Pages File Format Full-Text
53823 46986 2015 10 PDF Available
Title
Hydrocarbon fuel synthesis from sorbitol over bifunctional catalysts: Association of tungstated titania with platinum, palladium or iridium
Abstract

•Stability of metallic catalysts in water depends on the nature of support and metal.•We observed that ZrO2 tends to stabilize the metallic phase of platinum catalysts better than that of iridium or palladium.•Catalyst performances are studied for sorbitol transformation in aqueous media.•Ir or Pd/ZrO2 + TiO2–WOx selectively transform sorbitol into isosorbide and C5–C6 compounds (pentanols, hexanols, pentane and hexane).•Pt/ZrO2 + TiO2–WOx catalyzes the dehydration–hydrogenation of sorbitol into long-chain alkanes.

To selectively transform sorbitol into hydrocarbons in aqueous phase, new bifunctional catalytic systems are designed by associating a hydrogenating metallic catalyst (M/ZrO2, M = Pt, Ir or Pd) and a dehydrating acidic catalyst (TiO2–WOx) in a mechanical mixture. Zirconium oxide was chosen as support because it has virtually no dehydration activity and gives a good stability to the metal in water. This stability is evaluated through several characterizations before and after contact with the aqueous reaction medium. It is proposed that stability in water is driven by two parameters. The support stability is a key parameter for the overall catalyst stability, and the metal–support interaction determines the sintering extent. The nature of the metal has also an important influence on the activity and selectivity of the bifunctional M/ZrO2 + TiO2–WOx system for sorbitol transformation. Pd and Ir are slightly active and mainly transform sorbitol into isosorbide, whereas Pt is selective for long-chain alkane production. The mass ratio between metallic and acidic catalysts in the mechanical mixture also modifies the yield structure, with a Pt/ZrO2:TiO2–WOx 20:80 ratio for optimal liquid hydrocarbons production.

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Keywords
Aqueous phase dehydration/hydrogenation (APD/H); Biofuels; Iridium; Palladium; Platinum; Sorbitol; TiO2–WO3
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Hydrocarbon fuel synthesis from sorbitol over bifunctional catalysts: Association of tungstated titania with platinum, palladium or iridium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 242, Part A, 15 March 2015, Pages 91–100
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us