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Au–Pd NPs immobilised on nanostructured ceriaand titania: impact of support morphology on the catalytic activity for selective oxidation

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Title: Au–Pd NPs immobilised on nanostructured ceriaand titania: impact of support morphology on the catalytic activity for selective oxidation
Authors: Khawaji, M
Chadwick, D
Item Type: Journal Article
Abstract: Bimetallic Au–Pd nanoparticles supported on different ceria and titania nanostructures have been prepared by sol-immobilisation, and evaluated in the solvent-less selective oxidation of benzyl alcohol. The catalysts were characterised by TEM, STEM, XRD, XPS, ICP-AES, and nitrogen adsorption–desorption measurements. The activity of the catalysts was found to be strongly related to the morphology, structure and physiochemical properties of the supports. Au–Pd/ceria nanorods exhibited remarkably high catalytic activity (TOF > 35 900 h−1), and was found to be considerably more active than Au–Pd/titanate nanotubes, and Au–Pd catalysts supported on conventional ceria and titania nanopowders. The outstanding catalytic performance of Au–Pd/ceria nanorods is attributed to the unique surface chemistry of ceria nanorods, and the ability of catalyst preparation method (i.e. sol-immobilisation) to control the metal particle size and the bimetallic alloy formation. The presence of surface defects and high concentration of oxygen vacancies and Ce3+ in ceria nanorods is likely responsible for the stabilisation of Au–Pd NPs during sol-immobilisation, which led to a very small mean particle size (2.1 nm) corresponding to a dispersion of approximately 52%, and a high surface metal concentration.
Issue Date: 21-May-2018
Date of Acceptance: 16-Feb-2018
URI: http://hdl.handle.net/10044/1/61664
DOI: https://dx.doi.org/10.1039/c7cy02329d
ISSN: 2044-4753
Publisher: Royal Society of Chemistry
Start Page: 2529
End Page: 2539
Journal / Book Title: Catalysis Science and Technology
Volume: 8
Copyright Statement: © The Royal Society of Chemistry 2018. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K014749/1
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Chemistry
LIQUID-PHASE OXIDATION
SOLVENT-FREE OXIDATION
BENZYL ALCOHOL
BIMETALLIC CATALYSTS
GOLD NANOPARTICLES
HYDROGEN-PEROXIDE
CRYSTAL-PLANE
CO OXIDATION
OXYGEN
PALLADIUM
Publication Status: Published
Online Publication Date: 2018-04-18
Appears in Collections:Chemical Engineering
Faculty of Engineering