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Gold nanoparticles deposited on Amberlyst-15: Metal–acid bifunctional catalyst for cellobiose conversion to gluconic acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
54097 46996 2015 7 PDF Available
Title
Gold nanoparticles deposited on Amberlyst-15: Metal–acid bifunctional catalyst for cellobiose conversion to gluconic acid
Abstract

•Au solid-acid catalysts were prepared by alkaline impregnation of gold acetate.•Au nanoparticles (<8 nm) were deposited on amorphous SiO2–Al2O3 and Amberlyst-15.•Acidic form of the catalyst was obtained by the proton exchange after Au deposition.•Acidic Au/Amberlyst-15 was efficient for metal–acid bifunctional catalysis.•The catalyst afforded the direct conversion of cellobiose to gluconic acid at 373 K.

Gold nanoparticles were deposited on two kinds of solid acids, i.e., amorphous SiO2–Al2O3 and cation-exchange resin Amberlyst-15; the resultant materials exhibited high activity as metal–acid bifunctional catalysts. SiO2–Al2O3 was impregnated with a chloride-free alkaline Au(III) solution containing Na+ and then dried. After calcination at 623 K, gold nanoparticles with diameters of 4.2 nm (measured by X-ray diffraction) were deposited at a Au loading of 1.0 wt%. By replacing the Na+ ions with H+ ions through ammonium ion-exchange and heating, an acidic Au/SiO2–Al2O3 catalyst was obtained. In Amberlyst-15, gold nanoparticles with diameters of 7.3 nm were deposited after impregnation and drying. Subsequent ion-exchange with dilute sulfuric acid generated the acidic form of the Au/Amberlyst-15 catalyst, which showed an esterification activity equivalent to that of the original Amberlyst-15. The catalyst exhibited high activity for the direct conversion of cellobiose to gluconic acid, which requires both acid hydrolysis and oxidation. A 45% yield of gluconic acid was obtained after 24 h of reaction under ambient air at 373 K, with an apparent synergistic effect between the gold nanoparticles and acidic resin surface.

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Keywords
Gold nanoparticles; SiO2–Al2O3; Amberlyst-15; Bifunctional catalysis; Cellobiose; Gluconic acid
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Gold nanoparticles deposited on Amberlyst-15: Metal–acid bifunctional catalyst for cellobiose conversion to gluconic acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 251, 1 August 2015, Pages 96–102
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
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us