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Au–Pd/C catalysts for glyoxal and glucose selective oxidations

Paper ID Volume ID Publish Year Pages File Format Full-Text
41498 45891 2011 9 PDF Available
Title
Au–Pd/C catalysts for glyoxal and glucose selective oxidations
Abstract

A series of Au–Pd/C catalysts were prepared on an activated carbon named SX PLUS (SX+) by fixing the pH of impregnation in aqueous phase at an optimal value for maximizing the interactions between metals and surface. This bimetallic association leads to highly active catalysts in the oxidation of glyoxal into glyoxalic acid and of glucose into gluconic acid, with the activity correlated to high surface Pd/C ratios measured by XPS and the presence of small metallic Pd particles, even if gold was present as big crystallites. A cooperative effect between the two metals was evidenced on the yield in carboxylic acids in both reactions, which is believed to arise from an interface between the two metals even if they are mostly present as separated phases. The incorporation of Au on Pd rather than the opposite and the concomitant activation of both metals influence positively the catalytic performance. The use of NaBH4 as activating agent allowed the most active Au–Pd/C catalyst to be obtained, with similar performances to the best bimetallic Bi–Pd/C catalyst so far but without any metal leaching.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (80 K)Download as PowerPoint slideResearch highlights▶ Au–Pd/C catalysts were prepared by adsorption at optimized pH. ▶ The Au–Pd/C materials were highly active in selective glyoxal or glucose oxidation. ▶ A clear synergetic effect between the two metals was evidenced. ▶ Au plays a promoter role for Pd even in the form of big particles.

Keywords
Carbon; Palladium; Gold; Adsorption; Oxidation
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Au–Pd/C catalysts for glyoxal and glucose selective oxidations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 395, Issues 1–2, 15 March 2011, Pages 19–27
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us