5 years ago

Highly active Pt/NaxTiO2 catalyst for low temperature formaldehyde decomposition

Highly active Pt/NaxTiO2 catalyst for low temperature formaldehyde decomposition
A series of titania nanowires containing different Na content (Na x TiO2) were prepared from sodium titanate by varying the pH value of ion-exchange. They were used to load the Pt nanoparticles for low temperature formaldehyde catalytic oxidation. As prepared samples were systematically characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), in situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS), temperature programmed reduction/desorption/oxidation (TPR/TPD/TPO) and so on. The results showed that Na x TiO2 were consisted of anatase and sodium titanate. As pH value increased, the surface area and anatase content of catalyst decreased. Pt particles on Na x TiO2 were more easily oxidized and had smaller size but less exposed atoms compared with those on pure TiO2. The HCHO catalytic oxidation result exhibited that Pt/Na x TiO2 catalysts possessed excellent HCHO catalytic oxidation at ambient temperature that were 8.9–52.8 times the activities as that of Pt/TiO2. Kinetic studies manifested the easy activation of HCHO reaction over Pt/Na x TiO2 catalysts. Structure-performance analysis showed that the enhanced performance of Pt/Na x TiO2 catalysts was mainly attributed to two factors: increase in HCHO adsorption amount and change in HCHO decomposition pathway. According to HCHO-DRIFTS, linearly adsorbed CO generated from formate can react with hydroxyls to be carbonate/bicarbonate over Pt/Na x TiO2 catalysts. Simultaneously, the formate in Pt/Na x TiO2 catalyst with high Na content was also decomposed into a weak adsorbed CO. Both reaction pathways avoided the strong adsorption of CO on Pt/Na x TiO2 catalysts, which can facilitate the HCHO decomposition.

Publisher URL: www.sciencedirect.com/science

DOI: S0926337317307221

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