Selective catalytic oxidation over Au-Pd/titanate nanotubes and the influence of the catalyst preparation method on the activity
File(s)
Published version
Author(s)
Khawaji, Motaz
Chadwick, David
Type
Journal Article
Abstract
The dependence of the selective oxidation catalytic activity of Au-Pd supported on titanate nanotubes on the catalyst preparation method has been investigated. The most active Au-Pd/Ti-NT catalyst for the selective oxidation of benzyl alcohol is shown to be that prepared using colloidal synthesis and immobilization with PVA as a stabilizer, which has markedly superior catalytic activity compared to catalysts prepared by deposition-precipitation, adsorption, and dry impregnation methods. Au-Pd NPs stabilized by graphene oxide sheets and immobilized on Ti-NT has also been studied and while not optimum shows promising catalytic activity. The superior catalytic activity of the catalysts prepared by colloidal synthesis is attributed to the high metal dispersion on the external surfaces of Ti-NT, the narrow particle size distribution, and the high degree of Au-Pd alloying. This work also demonstrates that in the adsorption method of preparation using HAuCl4.3H2O and PdCl2 precursors, the uptake of Pd ions in solution by Ti-NT is proportional to the sodium content in Ti-NT, which implies that Na is involved in an ion-exchange reaction with Pd ions.
Date Issued
2019-08-15
Date Acceptance
2018-11-30
Citation
Catalysis Today, 2019, 334, pp.122-130
ISSN
0920-5861
Publisher
Elsevier BV
Start Page
122
End Page
130
Journal / Book Title
Catalysis Today
Volume
334
Copyright Statement
© 2018 Elsevier Ltd. 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
Science & Technology
Physical Sciences
Technology
Chemistry, Applied
Chemistry, Physical
Engineering, Chemical
Chemistry
Engineering
Gold-palladium
Titanate nanotubes
Sol-immobilization
Graphene oxide
Selective oxidation
LIQUID-PHASE OXIDATION
TITANATE NANOTUBES
BIMETALLIC CATALYSTS
GOLD
NANOPARTICLES
STABILITY
CHEMISTRY
PALLADIUM
TIO2
SIO2
Physical Chemistry
03 Chemical Sciences
09 Engineering
Publication Status
Published
Date Publish Online
2018-12-04