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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Probing surface oxide formations on SiO2-supported platinum nanocatalysts under CO oxidation

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Title
Probing surface oxide formations on SiO2-supported platinum nanocatalysts under CO oxidation
Author(s)
Sunyoung Oh; Seoin Back; Won Hui Doh; Song Yi Moon; Jeongjin Kim; Yousung Jung; Jeong Young Park
Publication Date
2017-09
Journal
RSC Advances, v.7, no.71, pp.45003 - 45009
Publisher
ROYAL SOC CHEMISTRY
Abstract
Formations of an ultrathin oxide layer on noble metal catalysts affect the characteristics of fundamental molecular behaviours such as adsorption, diffusion, and desorption on their surfaces. That is directly correlated to enhancement of catalytic activity under operating conditions because the kinetics of catalytic reactions are also simultaneously influenced. Especially, a sub-monolayered surface oxide is known as having a key role for improving catalytic activity, but revealing its existence in catalysis is challenging due to their fast chemical conversion. Herein, we report the first evidence of surface oxide formations on platinum (Pt) nanocatalysts under CO oxidation probed with a diffuse reflectance infrared Fourier transform (DRIFT) technique. Spectroscopic information demonstrates that the abrupt blue shift of adsorbed CO molecules vibrational frequencies of CO stretching mode on the reduced Pt nanocatalyst surface is initiated prior to aggressive CO conversion to CO2 gas molecules. Site-specific replacements of the adsorbed CO molecule with dissociative oxygen occur just before the ignition temperature that is supposed to be an important reaction step for CO oxidation over a Pt nanocatalyst. Density functional theory (DFT) calculation results support this phenomenon as a function of relative atomic fractions between CO and O on a Pt model surface and consistently show a similar trend with experimental evidence. © 2017 The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/4133
ISSN
2046-2069
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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