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Effect of the preparation method of supported Au nanoparticles in the liquid phase oxidation of glycerol

Paper ID Volume ID Publish Year Pages File Format Full-Text
38963 45798 2016 9 PDF Available
Title
Effect of the preparation method of supported Au nanoparticles in the liquid phase oxidation of glycerol
Abstract

•Au nanoparticles (NPs) were prepared and supported on AC and TiO2.•The effect of Au concentration and the influence of the stabilizer were studied.•The stabilizer amount and Au concentration produced Au NPs with different size.•The catalytic performance of the Au catalysts was studied for glycerol oxidation.•Activity and selectivity were influenced by gold size and stabilizer amount.

Catalytically-active gold nanoparticles that are stable in aqueous solution have been prepared by sodium borohydride reduction of the respective metal salts in the presence of the stabilising polymer PVA (polyvinylalcohol). By controlling the ratio of the polymer to the metal, nanoparticles with different particle size and size distribution were synthesised. By varying the concentration of the gold and PVA/Au wt/wt ratio, well-defined nanoparticles with mean diameters from 3 to 5 nm could be fabricated. In general increasing the concentration of Au precursor, bigger particles size were obtained. Furthermore decreasing the amount of PVA, bigger particles were obtained, with the exception of the catalysts synthesized in presence of a large amount of PVA (PVA/Au = 2) wt/wt. Probably, in presence of an excess of protective agent, the immobilization of the Au nanoparticles onto the support is more difficult, leading to partial aggregation and coalescence of Au. In addition, the studies on the effect of heat pre-treatment revealed a higher resistance to aggregation of Au nanoparticles supported on titania than on activated carbon. A selected series of the synthesised supported materials were studied in the liquid phase oxidation of glycerol with the purpose of correlating catalytic activity and selectivity with particle size and metal choice. We demonstrated that by both particles size and amount of protective agent strongly influence the activity and selectivity.

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Keywords
Gold; Nanoparticles; Liquid phase oxidation; Heat treatment; Stabiliser effect
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Effect of the preparation method of supported Au nanoparticles in the liquid phase oxidation of glycerol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 514, 25 March 2016, Pages 267–275
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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