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Pd-LaFeO3 catalysts in aqueous ethanol: Pd reduction, leaching, and structural transformations in the presence of a base

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Title: Pd-LaFeO3 catalysts in aqueous ethanol: Pd reduction, leaching, and structural transformations in the presence of a base
Authors: Checchia, S
Mulligan, CJ
Emerich, H
Alxneit, I
Krumeich, F
Di Michiel, M
Thompson, PBJ
Hii, KKM
Ferri, D
Newton, MA
Item Type: Journal Article
Abstract: The reactive behavior of three catalysts based on Pd-loaded LaFeO3 was investigated in terms of the reducibility of Pd and its propensity to leaching into the liquid phase in flowing solutions prototypical of C–C coupling catalysis in a continuous flow reactor cell. In situ quick extended X-ray absorption fine structure spectroscopy showed that Pd remains stable and nonreducible in the flowing ethanol/water solvent mixture under heating to 353 K. However, ex situ transmission electron microscopy, high-energy X-ray diffraction, and fluorescence yield Fe K-edge X-ray absorption near-edge structure show that the addition of a significant amount of base (K2CO3, 0.1 M) results in the structural degradation of the perovskite support as well as the mobilization of Pd along the sample bed that is dependent on the structure and crystallite size of the perovskite. The results are discussed in terms of the use of perovskite-type oxides in various areas of research where they are placed in contact with liquid phases of variable temperature and elevated pH.
Issue Date: 20-Mar-2020
Date of Acceptance: 1-Feb-2020
URI: http://hdl.handle.net/10044/1/77383
DOI: 10.1021/acscatal.9b04869
ISSN: 2155-5435
Publisher: American Chemical Society (ACS)
Start Page: 3933
End Page: 3944
Journal / Book Title: ACS Catalysis
Volume: 10
Copyright Statement: © 2020 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acscatal.9b04869
Sponsor/Funder: Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/L50547X/1
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
palladium catalysis
Suzuki coupling
basic condition
X-ray absorption spectroscopy
X-ray diffraction
pair distribution function
0302 Inorganic Chemistry
0305 Organic Chemistry
0904 Chemical Engineering
Publication Status: Published online
Article Number: acscatal.9b04869
Online Publication Date: 2020-02-11
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences