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Compound Formation in Model Catalysts

Westerström, Rasmus LU (2010)
Abstract
In this thesis we have performed a systematic atomic scale characterization of model catalysts under pressures ranging from UHV to atmospheric ambient. By using a unique approach, linking UHV and high pressures studies by combining traditional electron based techniques with novel high pressure in situ probes and ab initio calculations, the surface structure of the different model catalysts could be determined under a wide range of conditions, spanning more than ten orders of magnitude in pressure. The complexity of the model systems were gradually increased, from a ¨flat" low index single crystal surface, to more complex "stepped" vicinal surfaces, and finally dispersed nanoparticles on an oxide support. By using in situ diffraction and... (More)
In this thesis we have performed a systematic atomic scale characterization of model catalysts under pressures ranging from UHV to atmospheric ambient. By using a unique approach, linking UHV and high pressures studies by combining traditional electron based techniques with novel high pressure in situ probes and ab initio calculations, the surface structure of the different model catalysts could be determined under a wide range of conditions, spanning more than ten orders of magnitude in pressure. The complexity of the model systems were gradually increased, from a ¨flat" low index single crystal surface, to more complex "stepped" vicinal surfaces, and finally dispersed nanoparticles on an oxide support. By using in situ diffraction and spectroscopy techniques, we have followed the oxidation and reduction process, as well as carbide formation, on Pd nanoparticles deposited on oxide supports. In order to determine the reactivity of the different surface structures, in situ measurements were performed on single crystal surfaces under reaction conditions. By using surface x-ray diffraction we could correlate an increase in the production of CO2 with the formation of oxides. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Thornton, Geoff, University College London
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Fysicumarkivet A:2010:Westerström
defense location
Sal B
defense date
2010-06-11 10:15
ISBN
978-91-628-8131-3
language
English
LU publication?
yes
id
fb118778-e58f-4237-8338-55becdd82a40 (old id 1604795)
date added to LUP
2010-05-18 13:54:05
date last changed
2016-09-19 08:45:17
@phdthesis{fb118778-e58f-4237-8338-55becdd82a40,
  abstract     = {In this thesis we have performed a systematic atomic scale characterization of model catalysts under pressures ranging from UHV to atmospheric ambient. By using a unique approach, linking UHV and high pressures studies by combining traditional electron based techniques with novel high pressure in situ probes and ab initio calculations, the surface structure of the different model catalysts could be determined under a wide range of conditions, spanning more than ten orders of magnitude in pressure. The complexity of the model systems were gradually increased, from a ¨flat" low index single crystal surface, to more complex "stepped" vicinal surfaces, and finally dispersed nanoparticles on an oxide support. By using in situ diffraction and spectroscopy techniques, we have followed the oxidation and reduction process, as well as carbide formation, on Pd nanoparticles deposited on oxide supports. In order to determine the reactivity of the different surface structures, in situ measurements were performed on single crystal surfaces under reaction conditions. By using surface x-ray diffraction we could correlate an increase in the production of CO2 with the formation of oxides.},
  author       = {Westerström, Rasmus},
  isbn         = {978-91-628-8131-3},
  keyword      = {Fysicumarkivet A:2010:Westerström},
  language     = {eng},
  school       = {Lund University},
  title        = {Compound Formation in Model Catalysts},
  year         = {2010},
}