Synthesis and Characterization of Sol-Gel derived TiO2 catalysts

• Main Authors: Yeh Chih Yang, 葉志揚
• Other Authors: Jerrery Chi-Sheng Wu
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/59341174500495685615

碩士 === 國立臺灣大學 === 化學工程學研究所 === 88 === The objective of this study is to synthesize nano-particle titanium dioxide catalyst using Ti alkoxide via sol-gel route. Unlike the traditional technique, the hydrolyzing water is provided by the esterification of butanol and acetic acid. In addition, acetic acid also serves as chelating agent to stabilize the hydrolysis-condensation process and to avoid fast precipitation so that we could produce homo-geneous titanium dioxide sol. Esterification was verified by the product, butyl acetate, determined by a GC/Mass. The chelating complex was evidenced from FT-IR spectrum. After calcination at 500oC, anatase form titanium dioxide catalyst was obtained. Using Sol-Gel process, we also added some CuCl2 or H2PtCl6‧xH2O in TiO2 sol, and the products was reduced by H2 at 400oC for 3 hours. Then, Cu/TiO2 and Pt/TiO2 were prepared in reductive form with different metal content. TEM showed catalyst particles size via sol-gel process were about 15-25nm; XRD spectra indicated anatase form TiO2; In UV-Vis analysis, it was found that Cu/TiO2 had a blue shift effect, resulting in higher band gap energy; From XPS measurement, it was found that the Ti(2p) of Cu/TiO2 shifted to higher binding energy, and was suggested that Cu had an ability to catch electrons; But the Ti(2p) of Pt/TiO2 shifted to lower binding energy, we suggested that Pt and Ti had strong metal support interaction(SMSI); By BET measurement, sol-gel derived TiO2 had surface area four times higher than that of Merck TiO2. Their surface area was about 30-70 m2/g, and pore size was in the range of 30-80A.