Pd-LaFeO3 catalysts in aqueous ethanol: Pd reduction, leaching, and structural transformations in the presence of a base
File(s)
Accepted version
Author(s)
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.
Date Issued
2020-03-20
Date Acceptance
2020-02-01
Citation
ACS Catalysis, 2020, 10, pp.3933-3944
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
Engineering and Physical Sciences Research Council
Identifier
https://pubs.acs.org/doi/10.1021/acscatal.9b04869
Grant Number
EP/L50547X/1
Subjects
Science & Technology
Physical Sciences
Chemistry, Physical
Chemistry
palladium catalysis
leaching
Suzuki coupling
basic condition
X-ray absorption spectroscopy
X-ray diffraction
pair distribution function
X-RAY-DIFFRACTION
OXYGEN REDUCTION
SUPPORTED PD
PALLADIUM CATALYSTS
FOURIER-ANALYSIS
PEROVSKITE
FLOW
TRANSITION
CHEMISTRY
SIZE
0302 Inorganic Chemistry
0305 Organic Chemistry
0904 Chemical Engineering
Publication Status
Published online
Article Number
acscatal.9b04869
Date Publish Online
2020-02-11