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Kinetics of ethylene oxidation on plane Pt/SiO2 catalysts in the viscous pressure regime: Evidence of support activity

Ackelid, U ; Wallenberg, LR LU and Petersson, LG (1996) In Catalysis Letters 39(1-2). p.129-139
Abstract
C2H4 oxidation on plane Pt/SiO2 model catalysts with various Pt loadings was studied at T = 373-473 K and in the pressure ranges 10-6-102 Torr C2H4 and 0.3-1500 Torr O2 (1 Torr = 133.3 Pa). Mass spectrometry combined with spatially resolved gas sampling enabled kinetic data to be collected far into the viscous pressure regime. Reaction orders and activation energies were similar to those of a macroscopic Pt surface. However, under fuel-lean conditions the global reaction rate decreases faster than the decrease in metal area. On the other hand, the global rate was independent of Pt loading and metal surface area in fuel-rich gas mixtures. This is interpreted in terms of a spillover effect.
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ethylene oxidation, platinum, silica-supported catalyst, spatially resolved gas sampling, transmission electron microscopy, support activity, spillover
in
Catalysis Letters
volume
39
issue
1-2
pages
11 pages
publisher
Springer
external identifiers
  • scopus:0344159152
ISSN
1011-372X
DOI
10.1007/BF00813742
language
English
LU publication?
yes
id
48bb58c5-5db7-4029-8c1c-7c77bae8cbc0
date added to LUP
2023-10-31 15:50:40
date last changed
2023-11-03 08:37:01
@article{48bb58c5-5db7-4029-8c1c-7c77bae8cbc0,
  abstract     = {{C2H4 oxidation on plane Pt/SiO2 model catalysts with various Pt loadings was studied at T = 373-473 K and in the pressure ranges 10-6-102 Torr C2H4 and 0.3-1500 Torr O2 (1 Torr = 133.3 Pa). Mass spectrometry combined with spatially resolved gas sampling enabled kinetic data to be collected far into the viscous pressure regime. Reaction orders and activation energies were similar to those of a macroscopic Pt surface. However, under fuel-lean conditions the global reaction rate decreases faster than the decrease in metal area. On the other hand, the global rate was independent of Pt loading and metal surface area in fuel-rich gas mixtures. This is interpreted in terms of a spillover effect.}},
  author       = {{Ackelid, U and Wallenberg, LR and Petersson, LG}},
  issn         = {{1011-372X}},
  keywords     = {{ethylene oxidation; platinum; silica-supported catalyst; spatially resolved gas sampling; transmission electron microscopy; support activity; spillover}},
  language     = {{eng}},
  number       = {{1-2}},
  pages        = {{129--139}},
  publisher    = {{Springer}},
  series       = {{Catalysis Letters}},
  title        = {{Kinetics of ethylene oxidation on plane Pt/SiO2 catalysts in the viscous pressure regime: Evidence of support activity}},
  url          = {{http://dx.doi.org/10.1007/BF00813742}},
  doi          = {{10.1007/BF00813742}},
  volume       = {{39}},
  year         = {{1996}},
}