|About this Abstract
||Materials Science & Technology 2011
||Solution-Based Processing for Ceramic Materials
||Novel Catalytic Phenomena of Mesoporous Silica Composites Controlled by Sol-Gel Processing
||Junichi Hojo, Shougo Yamashita, Miki Inada, Yumi Tanaka, Naoya Enomoto
|On-Site Speaker (Planned)
Mesoporous silica can be applied to highly-efficient adsorbent and catalyst to eliminate harmful chemical species because of the large surface area and the versatility to be composited with the other metallic oxides. Mesoporous silica-titania composites have been synthesized by a sol-gel process using metal alkoxides and organic templates. One problem is the difference in hydrolysis rate between silicon alkoxide and titanium alkoxide. In order to solve the problem, silicon alkoxide was pre-hydrolyzed and titanium alkoxide was capped with a chelating agent to reduce the hydrolysis rate. The homogeneous incorporation of titania into silica network enhanced the adsorption ability. When the titania content was increased, the titania nanoparticles were deposited, which were effective as photocatalyst to decompose organic molecules. The combined functions of adsorption and decomposition are interesting for application to water and gas purification. The relationship between composite structure and adsorption-catalytic property will be discussed.