Influence of Preparation Conditions of Coated TiO₂ Film on CO₂ Reforming Performance

Abstract

To improve the CO₂ reforming performance of TiO₂ photocatalyst, the influence on the performance of preparation conditions was evaluated for TiO₂ films prepared by sol gel and dip coating method. Surface characteristics of coated TiO₂ films were observed and analyzed, and the relationship between surface characteristics and the CO₂ reforming performance was investigated. As a result, the CO₂ reforming performance was found to improve with increasing coating number up to 11, because of increases in the amount of coated TiO₂ and, the surface area of the coated TiO₂ film. When films with the optimal coating number were fired for 60, 300 or 540 s, the CO₂ reforming performance was found to improve with longer firing duration time, because of the increased surface area of coated TiO₂ film. When the amount of TiO₂ in one coating was varied by adjusting the ratio of the amount of added TiO₂ powder to the amount of TiO₂ in the sol solution, it was found that the CO₂ reforming performance was improved by setting the amount of TiO₂ powder to be added according to coating number.