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

被引：6
作者：
Zhang, C. [1 ]
Lundgren, E. [1 ]
Carlsson, P. -A. [2 ]
Balmes, O. [3 ]
Hellman, A. [2 ]
Merte, L. R. [1 ]
Shipilin, M. [1 ]
Onderwaater, W. [4 ,5 ]
Gustafson, J. [1 ]
机构：
[1] Lund Univ, Synchrotron Radiat Res, SE-22100 Lund, Sweden
[2] Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden
[3] Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden
[4] ESRF European Synchrotron, Grenoble, France
[5] Leiden Univ, Huygens Kamerlingh Onnes Lab, NL-2333 CA Leiden, Netherlands
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2015年 / 119卷 / 21期
关键词：
PT-GROUP METALS; PRESSURES; 2; PALLADIUM; CATALYTIC CO OXIDATION; IN-SITU; ULTRAHIGH-VACUUM; RH; PD(100); SURFACES; RH(111); STEPS;
D O I：
10.1021/acs.jpcc.5b01841
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 O-2 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 surface is observed to expose (331) or (11 (1) over bar) facets in coexistence with larger (111) terraces. The observed facet formation has previously been observed for pure O-2 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.
引用
收藏
页码：11646 / 11652
页数：7
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