Faceting of Rhodium(553) in Realistic Reaction Mixtures of Carbon Monoxide and Oxygen
Artikel i vetenskaplig tidskrift, 2015

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.

CO oxidation

vicinal surface

Surface X-ray diffraction

Författare

Chu Zhang

Lunds universitet

Edvin Lundgren

Lunds universitet

Per-Anders Carlsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Olivier Balmes

Lunds universitet

Anders Hellman

Kompetenscentrum katalys (KCK)

Lindsay R. Merte

Lunds universitet

Mikhail Shipilin

Lunds universitet

Willem Onderwaater

European Synchrotron Radiation Facility (ESRF)

Universiteit Leiden

Johan Gustafson

Lunds universitet

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 119 21 11646-11652

Tidsupplösta in situ metoder för design av katalytiska säten för hållbar kemi

Vetenskapsrådet (VR), 2013-01-01 -- 2016-12-31.

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Fysikalisk kemi

Den kondenserade materiens fysik

DOI

10.1021/acs.jpcc.5b01841

Mer information

Senast uppdaterat

2018-10-27