TITLE:
Adsorption of CO and NO on Ceria- and Pt-Supported TiO2: In Situ FTIR Study
AUTHORS:
Zeinhom M. El-Bahy
KEYWORDS:
In Situ FTIR; NO Reduction; CO Oxidation; TPD-CO; Platinum-Cerium
JOURNAL NAME:
Modern Research in Catalysis,
Vol.2 No.4,
October
8,
2013
ABSTRACT: Pt/TiO2, Ce/TiO2 and binary system
PtCe/TiO2 catalysts were prepared by impregnation method and the
structural properties of these catalysts were investigated by means of XRD, CO-TPD and UV-vis diffuse reflectance spectroscopy.
As investigated by XRD, the composition of the prepared samples anatase and
rutile phases with higher amount of anatase phase and its
particle size was in the range of 19 - 22 nm. The band gap also decreased from 3.1 to
2.85 after addition of metal to TiO2. The adsorption and interaction
properties of NO and/or CO gases were monitored using an in situ FTIR technique. The intensity and position of the infrared
peaks were strongly dependent on the composition of the catalyst. In presence
of Pt, the main oxidative reductive products of (NO + CO) are
CO2 and NCO complex. The formation of NCO
depends on not only the presence of platinum in the catalyst but also the
presence of Lewis acid sites which is Ti4+ in this study. However,
the interaction between NO and CO gases increased in presence of CeO2.
The optimum Ce content in PtCe/TiO2 was 0.1% (Ce/TiO2)
at which the maximum peak intensity was observed for NCO and CO2.