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CO and D2O chemistry on continuous and discontinuous samaria thin films on Pt(111) : The surface science of heterogeneous catalysis: In honor of Robert J. Madix

Jhang, Jin-Hao; Keil, Simona; Schaefer, Andreas LU ; Zielasek, Volkmar and Bäumer, Marcus (2016) In Surface Science 650. p.221-229
Abstract
Abstract The chemistry of CO and D2O, individually adsorbed or co-adsorbed, on epitaxial thin films of samaria on Pt(111) was studied by temperature-programmed desorption spectroscopy (TPD). Continuous thin films as well as discontinuous films composed of samaria islands on bare Pt(111) were prepared. Their comparative study indicates that Sm2O3 islands provide lattice oxygen at their perimeter for CO oxidation on adjacent exposed Pt area where CO adsorption takes place. CO2 production was observed only on as-prepared discontinuous films. While, in particular on thermally reduced samaria islands, TPD after D2O adsorption revealed D2 production which indicates a pathway for D2O dissociation, no evidence for the water gas shift reaction of... (More)
Abstract The chemistry of CO and D2O, individually adsorbed or co-adsorbed, on epitaxial thin films of samaria on Pt(111) was studied by temperature-programmed desorption spectroscopy (TPD). Continuous thin films as well as discontinuous films composed of samaria islands on bare Pt(111) were prepared. Their comparative study indicates that Sm2O3 islands provide lattice oxygen at their perimeter for CO oxidation on adjacent exposed Pt area where CO adsorption takes place. CO2 production was observed only on as-prepared discontinuous films. While, in particular on thermally reduced samaria islands, TPD after D2O adsorption revealed D2 production which indicates a pathway for D2O dissociation, no evidence for the water gas shift reaction of CO and residual OD species on the surface was found after co-adsorption of CO and D2O. Instead, interaction between CO and OD species at the perimeter of islands on reduced discontinuous SmOx thin films obviously promotes D2 formation without yielding CO2 as desorbing product. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
water gas shift reaction, catalysis, rare earth oxides, samaria, platinum, TPD
in
Surface Science
volume
650
pages
9 pages
publisher
Elsevier
external identifiers
  • Scopus:84975787045
ISSN
0039-6028
DOI
10.1016/j.susc.2016.02.005
language
English
LU publication?
yes
id
fb710699-87fd-4d53-be58-7b272449547d
alternative location
http://www.sciencedirect.com/science/article/pii/S0039602816000601
date added to LUP
2016-08-25 11:20:28
date last changed
2016-10-13 05:12:46
@misc{fb710699-87fd-4d53-be58-7b272449547d,
  abstract     = {Abstract The chemistry of CO and D2O, individually adsorbed or co-adsorbed, on epitaxial thin films of samaria on Pt(111) was studied by temperature-programmed desorption spectroscopy (TPD). Continuous thin films as well as discontinuous films composed of samaria islands on bare Pt(111) were prepared. Their comparative study indicates that Sm2O3 islands provide lattice oxygen at their perimeter for CO oxidation on adjacent exposed Pt area where CO adsorption takes place. CO2 production was observed only on as-prepared discontinuous films. While, in particular on thermally reduced samaria islands, TPD after D2O adsorption revealed D2 production which indicates a pathway for D2O dissociation, no evidence for the water gas shift reaction of CO and residual OD species on the surface was found after co-adsorption of CO and D2O. Instead, interaction between CO and OD species at the perimeter of islands on reduced discontinuous SmOx thin films obviously promotes D2 formation without yielding CO2 as desorbing product.},
  author       = {Jhang, Jin-Hao and Keil, Simona and Schaefer, Andreas and Zielasek, Volkmar and Bäumer, Marcus},
  issn         = {0039-6028},
  keyword      = {water gas shift reaction,catalysis,rare earth oxides,samaria,platinum,TPD},
  language     = {eng},
  pages        = {221--229},
  publisher    = {ARRAY(0xd8fef90)},
  series       = {Surface Science},
  title        = {CO and D2O chemistry on continuous and discontinuous samaria thin films on Pt(111) : The surface science of heterogeneous catalysis: In honor of Robert J. Madix},
  url          = {http://dx.doi.org/10.1016/j.susc.2016.02.005},
  volume       = {650},
  year         = {2016},
}