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

Chu Zhang ; Edvin Lundgren ; Per-Anders Carlsson (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Olivier Balmes ; Anders Hellman (Kompetenscentrum katalys (KCK)) ; Lindsay Merte ; Mikhail Shipilin ; Willem Onderwaater ; Johan Gustafson
Journal of Physical Chemistry C (1932-7447). Vol. 119 (2015), 21, p. 11646-11652.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Surface X-ray diffraction, vicinal surface, CO oxidation



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Denna post skapades 2015-05-05. Senast ändrad 2015-06-30.
CPL Pubid: 216524

 

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