Abstract
Catalytic oxidation of CO with ozone had been studied over Al2O3 and SiO2 supported Pd nanoparticles which was synthesized by two different methods. The polyol method mainly resulted in highly dispersed Pd particles on the support, while the impregnation method resulted in agglomeration Pd particles on the support. Supported Pd nanoparticles synthesized from PdCl2 in the presence of poly (N-vinylpyrrolidone) (PVP) by chemical reduction. The catalysts were characterized by X-ray diffraction, N2 BET surface area, pore size distributions, CO chemisorption, TEM and H2-temperature programmed reduction. The physico-chemical properties were well correlated with activity data. Characterizations of XRD and TEM show that the surface Pd nanoparticles are highly dispersed over Al2O3 and SiO2. The catalytic activity was dependent upon ozone/CO ratio, contact times, and the reaction temperature. The extent of carbon monoxide oxidation was proportional to the catalytically ozone decomposition. The PVP synthesized Pd/A2O3 catalyst had been found to be highly active for complete CO removal at room temperature. The higher activity of the nanocatalyst was attributed to small particle size and higher dispersion of Pd over support.
Highlights
Low temperature catalytic oxidation of CO over the supported nanosized metal catalyst has recently drawn much attention due to its high performance for controlling environmental pollution (Seyfi et al 2009)
Catalytic oxidation of CO with ozone had been studied over Al2O3 and SiO2 supported Pd nanoparticles which was synthesized by two different methods
temperature-programmed reduction (TPR) results confirmed that presence of smaller particles and higher Pd dispersion in the PVP-synthesized catalyst, which is due to small peak area of b-PdHx
Summary
Low temperature catalytic oxidation of CO over the supported nanosized metal catalyst has recently drawn much attention due to its high performance for controlling environmental pollution (Seyfi et al 2009). The nanosized Pd particles are protected by the bulky polymer groups of the stabilizer PVP on the surface PAN and PSN catalyst which can not penetrate through the pores of the support; whereas, in the case of PA and PS catalyst, Pd is adsorbed in several ways including the micropores of the support and such sites would be inaccessible for catalytic reaction (Simonov et al 1997).
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