Ti가 치환된 분자체상에서 acetic acid의 광촉매 산화 및 분해

Abstract

The photocatalytic oxidation and decomposition of monolayer of acetic acid adsorbed on TiO₂(Degussa P-25), titanium silicalite(TS-1) and Ti-MCM-41 were carried out, and the photocatalytic and product distributions over the catalysts were compared with each other. TS-1 and Ti-MCM-41 catalysts were prepared by in-situ crystallization and the Si/Ti ratio in the catalysts was 50. The catalysts were charaterized using XRD and UV-DRS. During photocatalytic oxidation(PCO), CO₂ and HCHO were formed on P-25, whereas CH₄ instead of HCHO formed on TS-1 and Ti-MCM-41. In photocatalytic decomposition(PCD) on P-25 TiO₂, CO₂, CH₄ and C2H6 were formed. On the contrary, CO₂ and CH₄ were formed on TS-1 and Ti-MCM-41 during PCD. The rates of product formation in PCO were higher compared with PCD. The TS-1 and Ti-MCM-41 catalysts are less active per gram of catalyst. But, the TS-1 and Ti-MCM-41 catalysts have much higher adsorption capacities for organics. Therefore, it seems that the TS-1 and Ti-MCM-41 catalysts have advantages in applications to PCO of organic contaminations under conditions where the organic concentrations vary widely.