Composition dependent selectivity of bimetallic Au-Pd NPs immobilised on titanate nanotubes in catalytic oxidation of glucose
File(s)Glucose oxidation paper revised Final.pdf (1.88 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
The catalytic performance of Au-Pd nanoparticles (NP) prepared by colloidal synthesis and immobilised on titanate nanotubes
(Ti-NT) in the selective oxidation of glucose to gluconic and glucaric acids has been studied under initially basic and relatively
mild conditions. Catalysts with varying compositions displayed quite different product selectivity especially in relation to deeper
oxidation. The yield of glucaric acid was found to be proportional to the atomic content of Au in the Au-Pd NPs: Au/Ti-NT
exhibited the highest selectivity to glucaric acid, while Au15Pd85/Ti-NT displayed the highest selectivity to gluconic acid, SGLO >
98%. Catalyst recycling revealed deactivation, which appears to be due to a combination of metal leaching, particle size changes
and product adsorption, and is associated with the gradual fall in pH of the reaction mixture. Results suggest that the leached Au
species play a significant role in the oxidation of gluconic to glucaric acid.
(Ti-NT) in the selective oxidation of glucose to gluconic and glucaric acids has been studied under initially basic and relatively
mild conditions. Catalysts with varying compositions displayed quite different product selectivity especially in relation to deeper
oxidation. The yield of glucaric acid was found to be proportional to the atomic content of Au in the Au-Pd NPs: Au/Ti-NT
exhibited the highest selectivity to glucaric acid, while Au15Pd85/Ti-NT displayed the highest selectivity to gluconic acid, SGLO >
98%. Catalyst recycling revealed deactivation, which appears to be due to a combination of metal leaching, particle size changes
and product adsorption, and is associated with the gradual fall in pH of the reaction mixture. Results suggest that the leached Au
species play a significant role in the oxidation of gluconic to glucaric acid.
Date Issued
2019-11-05
Date Acceptance
2019-05-30
Citation
Applied Catalysis B: Environmental, 2019, 256
ISSN
0926-3373
Publisher
Elsevier
Journal / Book Title
Applied Catalysis B: Environmental
Volume
256
Copyright Statement
© 2019 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/K014749/1
Subjects
Physical Chemistry
0306 Physical Chemistry (incl. Structural)
0904 Chemical Engineering
0907 Environmental Engineering
Publication Status
Published
Article Number
117799
Date Publish Online
2019-05-31