Imperial College London
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Professor King Kuok (Mimi) Hii

Faculty of Natural Sciences, Department of Chemistry

Professor of Catalysis
 
 
 
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Contact

 

mimi.hii Website CV

 
 
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Location

 

401KMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Newton:2016:10.1039/C6CY02073A,
author = {Newton, MA and Brazier, JB and Barreiro, EM and Emerich, H and Adrio, LA and Mulligan, C and Hellgardt, K and Hii, KM},
doi = {10.1039/C6CY02073A},
journal = {Catalysis Science & Technology},
pages = {8525--8531},
title = {Restructuring of supported Pd by green solvents: an operando Quick EXAFS (QEXAFS) study and implications for the derivation of structure-function relationships in Pd catalysis},
url = {http://dx.doi.org/10.1039/C6CY02073A},
volume = {6},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Transmission electron microscopy (TEM) is commonly used as an ex-situ technique to determine structural changes by comparing images of catalyst particles before and after a reaction. This requires the use of an alcoholic solvent to disperse the particles on a grid. In this work, we will show that Pd catalysts can be transformed during the procedure, by using EXAFS to determine the structure of Pd catalysts in different environments (as dry or wet samples). Supported palladium nanoparticles exposed to aqueous ethanolic solution (50% w/v)  are transformed to a common, reduced, and hydrogen-contaminated state, irrespective of their initial habit or support. Catalysts comprised of nanosize PdO are reduced at ca. 350 K, whereas samples comprised of very small (ca. ≤ 10 atoms) Pd particles react with the solvent at just above room temperature and agglomerating with considerable loss of dispersion. As such any potential benefits to catalysis sought through the synthesis of very highly dispersed metallic Pd  supported upon a range of inorganic dispersants will be rapidly erased through the action of such solvents.
AU  - Newton,MA
AU  - Brazier,JB
AU  - Barreiro,EM
AU  - Emerich,H
AU  - Adrio,LA
AU  - Mulligan,C
AU  - Hellgardt,K
AU  - Hii,KM
DO  - 10.1039/C6CY02073A
EP  - 8531
PY  - 2016///
SN  - 2044-4753
SP  - 8525
TI  - Restructuring of supported Pd by green solvents: an operando Quick EXAFS (QEXAFS) study and implications for the derivation of structure-function relationships in Pd catalysis
T2  - Catalysis Science & Technology
UR  - http://dx.doi.org/10.1039/C6CY02073A
UR  - http://hdl.handle.net/10044/1/42652
VL  - 6
ER  -
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