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

Author

Chu Zhang

Lund University

Edvin Lundgren

Lund University

Per-Anders Carlsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Olivier Balmes

Lund University

Anders Hellman

Competence Centre for Catalysis (KCK)

Lindsay R. Merte

Lund University

Mikhail Shipilin

Lund University

Willem Onderwaater

European Synchrotron Radiation Facility (ESRF)

Leiden University

Johan Gustafson

Lund University

Journal of Physical Chemistry C

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

Vol. 119 21 11646-11652

Time-resolved in situ methods for design of catalytic sites within sustainable chemistry

Swedish Research Council (VR), 2013-01-01 -- 2016-12-31.

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Physical Chemistry

Condensed Matter Physics

DOI

10.1021/acs.jpcc.5b01841

More information

Latest update

10/27/2018