Spectroscopic studies of NO reduction on Pt/TiO2 catalysts
Resource
Catalysis Today 97,121-127
Journal
Catalysis Today 97
Pages
121-127
Date Issued
2004
Date
2004
Author(s)
Chien, Shu-Hua
Kuo, Ming-Chih
Lu, Chain-Hwa
Lu, Kwa-Nan
DOI
246246/2006111501232990
Abstract
2 wt.% Pt/TiO2 catalyst was prepared by photochemical deposition (PCD) method with UV irradiation on an aqueous TiO2 suspension
containing hexachloroplatinic acid. The prepared catalyst exhibits nano-particles of Pt (~3 nm) uniformly dispersed on TiO2 surface as
evidenced by TEM. In situ FT-IR spectroscopic studies indicated that the catalyst exhibits high capacity for chemisorption of NO that led to
highly catalytic activity for NO reduction. The temperature programmed desorption profile of NO indicates that adsorption of NO was enhanced thermally & reduced to the major product of N2 with minor N2O on the prepared Pt/TiO2 catalyst. Photodecomposition of NO was
investigated by in situ DRIFT & EPR spectroscopy. The photocatalytic activity of the catalyst is highly dependent on its pretreatment. The catalyst after reduction in hydrogen at 300 8C is highly active for NO photodecomposition to N2 & N2O. The XPS spectra indicated the
mixed valence-states of Pt (Ptn+ & Pt0) presented on the catalyst surface that incorporated with reducible TiO2 support to present the super catalytic property of the PCD-prepared Pt/TiO2 catalyst.
Subjects
Pt/TiO2
NO decomposition
FT-IR
XPS
EPR
UHV-TPD
Publisher
Taipei:National Taiwan University Department of Chemistry
Type
journal article
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