Interaction of small gas phase molecules with alumina supported rhodium nanoparticles: an in situ spectroscopic
study
Interaction of small gas phase molecules with alumina supported rhodium nanoparticles: an in situ spectroscopic
study
Supported nanoparticulate Rh systems are studied as a model system for the important three way catalysts as used in the combustion engines of cars. Small Rh nanoparticles with a small particle size distribution can be easily synthesized and their morphology is studied using x-ray absorption fine structure (XAFS) spectroscopy.
The interaction of the supported rhodium nanoparticles on ? -Al2O3 with small gas phase molecules like H2, O2, CO, NO, H2S and SO2 is investigated, in situ and time resolved, using a combination of techniques, i.e. XAFS, diffuse
reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry.
The surface species formed upon exposure of the metal particles to the adsorbing molecules, and their sometimes disruptive interaction with the metal particles, are identified as a function of temperature and time. Dynamic equilibria are observed which change the oxidation state and
the nuclearity of the supported rhodium particles under operational conditions.
Rather than merely adsorb on a catalyst particle, these gases have a substantial role in defining the nature of
the particle.
184020-[10pp]
Evans, J.
05890433-0155-49fe-a65d-38c90ea25c69
Tromp, M.
48c1ebbb-579c-42b6-83bb-7188c668b322
17 April 2008
Evans, J.
05890433-0155-49fe-a65d-38c90ea25c69
Tromp, M.
48c1ebbb-579c-42b6-83bb-7188c668b322
Evans, J. and Tromp, M.
(2008)
Interaction of small gas phase molecules with alumina supported rhodium nanoparticles: an in situ spectroscopic
study.
Journal of Physics: Condensed Matter, 20 (18), .
(doi:10.1088/0953-8984/20/18/184020).
Abstract
Supported nanoparticulate Rh systems are studied as a model system for the important three way catalysts as used in the combustion engines of cars. Small Rh nanoparticles with a small particle size distribution can be easily synthesized and their morphology is studied using x-ray absorption fine structure (XAFS) spectroscopy.
The interaction of the supported rhodium nanoparticles on ? -Al2O3 with small gas phase molecules like H2, O2, CO, NO, H2S and SO2 is investigated, in situ and time resolved, using a combination of techniques, i.e. XAFS, diffuse
reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry.
The surface species formed upon exposure of the metal particles to the adsorbing molecules, and their sometimes disruptive interaction with the metal particles, are identified as a function of temperature and time. Dynamic equilibria are observed which change the oxidation state and
the nuclearity of the supported rhodium particles under operational conditions.
Rather than merely adsorb on a catalyst particle, these gases have a substantial role in defining the nature of
the particle.
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Published date: 17 April 2008
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Local EPrints ID: 146133
URI: http://eprints.soton.ac.uk/id/eprint/146133
ISSN: 0953-8984
PURE UUID: fa0448f2-24b5-4684-881d-b46cc9973e50
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Date deposited: 20 Apr 2010 15:28
Last modified: 29 Oct 2024 02:32
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Author:
M. Tromp
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