Effect of Pt particle size and valence state on the performance of Pt/TiO2 catalysts for CO oxidation at room temperature

Title
Effect of Pt particle size and valence state on the performance of Pt/TiO2 catalysts for CO oxidation at room temperature
Authors
권동욱김거종홍성창
Issue Date
2016-08
Publisher
The Journal of Physical Chemistry C
Citation
VOL 120, NO 32-18004
Abstract
A series of Pt/TiO2 catalysts with various Pt particle sizes and valence states were prepared and tested for CO oxidation at room temperature. Field-emission transmission electron microscopy and X-ray photoelectron spectroscopy analyses confirmed that the activity of the Pt/TiO2 catalyst was influenced by the particle size and valence state of the catalyst particles. Excellent CO oxidation activity was observed at room temperature using highly dispersed, small metallic Pt particles. Increasing the Pt-metallic/Pt-total ratio resulted in an increase of turnover frequencies. According to the Fourier-transform infrared spectroscopy results, the linear CO species that was adsorbed on metallic Pt sites at 25 degrees C reacted with atmospheric O-2 and was easily desorbed. However, linear CO species adsorbed on PtOx (x >= 2) sites was only desorbed at temperatures >= 100 degrees C, confirming the lack of CO oxidation activity at room temperature with ionic Pt catalysts.
URI
http://pubs.kist.re.kr/handle/201004/68159
ISSN
1932-7447
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KIST Publication > Article
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