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나노물질 및 화학반응 연구단
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Nature of Rh oxide on Rh nanoparticles and its effect on the catalytic activity of CO oxidation

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Title
Nature of Rh oxide on Rh nanoparticles and its effect on the catalytic activity of CO oxidation
Author(s)
Sun Mi Kim; Kamran Qadir; Seo, B.; Jeong, H.Y.; Joo, S.H.; Terasaki, O.; Jeong Young Park
Publication Date
2013-11
Journal
CATALYSIS LETTERS, v.143, no.11, pp.1153 - 1161
Publisher
SPRINGER
Abstract
Surface oxide layers formed on transition metal catalysts are well known as one of the controlling factors in enhancing or suppressing the catalytic activity of metal catalysts. We investigated the growth of a surface oxide layer on two sizes of Rh metal nanoparticles (NPs) as a function of UV-ozone (UV/O-3) dosing as well as how the oxide layer formed on the surface of the Rh NPs affects the catalytic activity for CO oxidation. Monodisperse Rh NPs were synthesized via one-pot polyol reduction using poly(vinylpyrrolidone) as a capping agent. Varying the concentration of the Rh precursors controlled the size of the NPs. The changes that occurred as a function of UV/O-3 dosing were characterized using X-ray photoelectron spectroscopy, which showed that the oxidation state increased with increasing surface modification time. The catalytic activity and activation energy of the two-dimensional Rh NPs arrays were measured as the UV/O-3 exposure time increased. Our reaction studies indicate that the turnover rate of CO oxidation on the Rh NPs is enhanced as the quantity of the surface oxide layer formed during UV/O-3 surface treatment increases, indicating that the oxides grown on the surface of the Rh metal are catalytically active. These results suggest an intriguing way to tune catalytic activity via engineering of
URI
https://pr.ibs.re.kr/handle/8788114/1217
ISSN
1011-372X
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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