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Faceting of Rhodium(553) in Realistic Reaction Mixtures of Carbon Monoxide and Oxygen

Zhang, Chu (author)
Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Lundgren, Edvin (author)
Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Carlsson, Per-Anders, 1972 (author)
Chalmers tekniska högskola,Chalmers University of Technology
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Balmes, Olivier (author)
Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Hellman, Anders, 1974 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Merte, Lindsay (author)
Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Shipilin, Mikhail (author)
Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Onderwaater, Willem (author)
European Synchrotron Radiation Facility (ESRF),Universiteit Leiden (UL),Leiden University (UL)
Gustafson, Johan (author)
Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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 (creator_code:org_t)
2015-05-18
2015
English.
In: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 119:21, s. 11646-11652
Related links:
http://dx.doi.org/10...
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https://research.cha...
https://doi.org/10.1...
https://lup.lub.lu.s...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We have investigated the gas composition-dependent faceting of a Rh(553) surface during catalytic CO oxidation under semirealistic reaction conditions using Surface X- ray Diffraction. We find that under stoichiometric CO and O2 conditions, the Rh(553) surface maintains its surface orientation without facet formation. In oxygen excess, the CO oxidation reaction becomes mass transfer limited by the CO diffusion, and the sur- face is observed to expose (331) or (11 ̄1) facets in coexistence with larger (111) terraces. The observed facet formation has previously been observed for pure O2 exposures of the Rh(553) surface, but at significantly lower O2 partial pressures. Surprisingly, in CO excess, which results in a CO poisoned surface with low activity, we instead find coexisting (110) and (111) facets. The reasons for and possible implications of the observed facetings are discussed.

Subject headings

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

CO oxidation
vicinal surface
Surface X-ray diffraction

Publication and Content Type

art (subject category)
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