Rhodium Nanoparticle Shape Dependence in the Reduction of NO by CO Page: 2 of 16
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Abstract
The shape dependence of the catalytic reduction of NO by CO on Rhodium
nanopolyhedra and nanocubes was studied from 230 - 2700C. The nanocubes are found to
exhibit higher turnover frequency and lower activation energy than the nanopolyhedra. These
trends are compared to previous studies on Rh single crystals.
Introduction
In recent years, intense efforts have been directed towards the development of a
molecular understanding of the role of nanoparticle properties such as size, structure, and
composition on catalytic activity and selectivity[1, 2]. Nanoparticle shape, in particular, has been
demonstrated to play an important role in catalysis[3-8]. The role of shape is thought to be
closely related to the role of structure-sensitivity in catalysis. As an example, a study of benzene
hydrogenation on -12-13 nm Pt nanoparticles found that both cyclohexene and cyclohexane
were formed on cuboctahedral nanoparticles, which are dominated by 111-faces, whereas only
cyclohexane was formed on 100-dominated cubic nanoparticles[5]. These selectivities were
consistent with previous results on (111) and (100) Pt single crystals[9, 10]. Nanoparticle shape
was also shown to play an important role in selectivity in pyrrole hydrogenation on Pt
nanopolyhedra and nanocubes[4]. This study found that although n-butylamine was the dominant
product for both 5 and 9 nm Pt nanocubes regardless of temperature, both pyrrolidine and n-
butylamine were formed on 5 nm Pt nanopolyhedra. These studies demonstrate the importance of
the role of nanoparticle shape in catalysis and, in particular, the importance of characterizing this
role in relation to single crystal studies on structure-sensitive reactions.Rhodium Nanoparticle Shape Dependence in the Reduction of NO by CO
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Renzas, J. R.; Zhang, Y.; Huang, W. & Somorjai, G. A. Rhodium Nanoparticle Shape Dependence in the Reduction of NO by CO, article, July 13, 2009; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1012735/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.