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Reaction pathways of glucose and fructose on Pt nanoparticles in subcritical water under a hydrogen atmosphere

Paper ID Volume ID Publish Year Pages File Format Full-Text
55641 47060 2011 6 PDF Available
Title
Reaction pathways of glucose and fructose on Pt nanoparticles in subcritical water under a hydrogen atmosphere
Abstract

The reactivity profiles of glucose (Glc), fructose (Fru), and possible intermediate compounds treated with Pt nanoparticles protected by polyethyleneimine (Pt-PEI) were studied at 403–543 K in subcritical water under a hydrogen atmosphere of 5 MPa. Isomerization between Glc and Fru proceeded at the temperature as low as 403 K and was accelerated by Pt-PEI and H2. The rate of isomerization from Glc to Fru in the presence of Pt-PEI and H2 was approximately three times greater than the rate of the reverse reaction. Yields of sorbitol and mannitol were maximized at 443 K and decreased at higher temperatures. Under reaction temperatures of 483–543 K, Glc produced mainly 1,2-propanediol, 1,2-hexanediol, and ethylene glycol, while Fru yielded 1,2-propanediol, 1,2-hexanediol, and glycerol. The molar ratios of C3 compounds to the sum of C2 and C4 compounds in this temperature range were approximately 2:1–1.5:1 in the former and 3:1–4:1 for Fru, indicating that C3 compounds can be preferentially produced from Fru. The reactivity profiles of sorbitol, mannitol, and 1,2-hexanediol were examined in separated experiments at 483–543 K, and it was found that these linear C6 compounds were not converted to the previously mentioned C2–C4 diols and triols. This suggests that there is little possibility for Glc or Fru to form C2–C4 compounds via sorbitol, mannitol, or 1,2-hexanediol on the Pt catalyst, and it is likely that retro-aldol reactions of Glc and Fru are the major routes to these molecules. The temperatures necessary to conduct these reactions on Pt were much lower than those without Pt.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (126 K)Download as PowerPoint slideHighlights► Glucose was easily isomerized to fructose at 403 K on a Pt catalyst in water under a H2 atmosphere, while the reverse reaction was somewhat difficult. ► Glucose and fructose were hydrogenated to sorbitol and mannitol, but these were not intermediates in the formation of C2–C4 compounds. ► Retro-aldol reactions of glucose and fructose preferentially proceeded at 483–543 K to afford C2–C4 diols and triols.

Keywords
Glucose; Fructose; Subcritical water; Pt nanoparticles; 1,2-Propanediol; Biomass
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Reaction pathways of glucose and fructose on Pt nanoparticles in subcritical water under a hydrogen atmosphere
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 58–63
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