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Glycerol oxidation with gold supported on carbon xerogels: Tuning selectivities by varying mesopore sizes

Paper ID Volume ID Publish Year Pages File Format Full-Text
46399 46439 2012 6 PDF Available
Title
Glycerol oxidation with gold supported on carbon xerogels: Tuning selectivities by varying mesopore sizes
Abstract

Two carbon xerogels (CX) with different pore size distributions were prepared by the conventional approach (condensation of resorcinol and formaldehyde). The key variable to control those sizes is the pH of the aqueous solution. Gold nanoparticles were supported on the prepared CXs by the sol immobilization method and tested in the selective oxidation of glycerol, with the main purpose of evaluating the influence of the textural properties on the activity and selectivity. Mesopore sizes of the support have a strong effect on the distribution of products: wide pores enhance the formation of dihydroxyacetone whereas narrow mesopores favor the oxidation towards glyceric acid. Additionally, the selectivity results obtained with carbon xerogels were compared with those achieved with other carbon supports (activated carbon and multi-walled carbon nanotubes) and the same trend was observed. Therefore, it seems that the distribution of products can be controlled by the adequate choice of the support. For this purpose, carbon xerogel is a promising material since its pore size can be easily modified in a controllable way during the preparation stage.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Gold supported on carbon xerogels are efficient catalysts for glycerol oxidation. ► Textural properties of support play a key role in the distribution of products obtained. ► Carbon xerogels with wide mesopores favor oxidation towards dihydroxyacetone. ► Selectivities correlate with mesopore sizes of different carbon supports.

Keywords
Glycerol; Oxidation; Gold; Carbon xerogel; Mesopore size; Selectivity
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Glycerol oxidation with gold supported on carbon xerogels: Tuning selectivities by varying mesopore sizes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 1–6
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