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NB doped TiO2 photocatalyst for CO2 reduction to methanol

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Document pages: 8 pages

Abstract: In order to pursue higher photoactivity, the CO2 reduction of niobium doped TiO2 powder was evaluated. The substitution of Ti by Nb in TiO2 Crystal structure promotes the formation of methanol. NB doped TiO2 powders were successfully synthesized at NB concentrations of 0.0, 0.5, 1.0 and 2.5 (w W). Pechini method was used. The material was calcined at 500 ° C for two hours to promote the formation of anatase phase. After characterization, a metal target was used in 2   under vacuum ×   10 − 3.   Torr, deposition time was 10 minutes and calcined again at 500 ° C for two hours. The surface area of the obtained powder is as high as 30   m2 g. The pechini method promotes theTi4+ for Nb4+ as observed using XRD and XPS techniques at the crystalline structure and at the surface of the powder. Furthermore, the presence of Nb0 was also observed at the powder’s surface. The presence of Nb in the crystalline structure increased the photoactivity of powders when compared to nonmodified TiO2 powders, while the Nb0 deposition at the powder’s surface decreased the photoactivity for all the investigated compositions.

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