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Catalytic oxidation of propane over Pt-Pd bimetallic nanoparticles supported on TiO2 by Roberto Camposeco; Ana E. Torres; Rodolfo Zanella is a Chemistry article available to read on EtoBox.

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The oxidation of propane to CO2 was performed by means of Pt-Pd nanoparticles supported on TiO2. The catalyst activities were evaluated through conversion versus temperature, where propane conversion profiles and reaction rates followed the order Pt-Pd/TiO2 > Pt/TiO2 > Pd/TiO2. It is proposed that the oxidation of propane on Pt-Pd/TiO2 catalysts occurs not only on Pt0 and Pd0 sites but also on Pt2+, Pd2+ and Ti3+ones, improving the oxidation pathway of propane as shown by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and X-ray Photoelectron Spectroscopy (XPS). Propane uptake and Lewis and Brönsted acidity type on the Pt-Pd/TiO2 catalyst were four times higher than on Pt/TiO2 and Pd/TiO2 as observed by FTIR-pyridine thermo-desorption. Ab-initio calculations showed that Pt enhanced the Brönsted acidity of the interface favoring a dissociative oxygen adsorption, whereas the bimetallic system presented more acidic Lewis sites which correlate with the catalytic activity. Then, hydrogen adsorption could be considered as a chemical reactivity descriptor for the oxidation of propane. Likewise, the higher activity of the Pt-Pd/TiO2 catalyst was explained by considerin

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Author

Roberto Camposeco; Ana E. Torres; Rodolfo Zanella

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Chemistry (Physical Sciences)