Size effects in gas-phase photo-oxidation of trichloroethylene using nanometer-sized TiO{sub 2} catalysts
TiO{sub 2} catalysts were prepared by using a modified sol-gel technique and were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and N{sub 2} physi-adsorption methods. The effects of different synthesis parameters on the size and morphology of the TiO{sub 2} particles were investigated. A method for obtaining TiO{sub 2} with different primary and secondary particle sizes was developed. By changing the water concentration during the hydrolysis of titanium isopropoxide, amorphous titania gel spheres of well-defined morphology and particle size were prepared. These gel spheres define the secondary particle or aggregate size. Following controlled thermal and hydrothermal treatments the primary TiO{sub 2} particles (anatase) were formed from the gel spheres without alteration of the aggregate size and shape. Anatase TiO{sub 2} catalysts with crystal size of 2.3--30 nm and aggregate size of 100--900 nm were prepared for the gas-phase photo-oxidation of trichloroethylene (TCE). The catalyst performance for TCE degradation exhibited strong dependence on both primary and secondary particle sizes of TiO{sub 2}.
- Research Organization:
- Hong Kong Univ. of Science and Technology, Kowloon (HK)
- OSTI ID:
- 20076102
- Journal Information:
- Journal of Catalysis, Vol. 192, Issue 1; Other Information: PBD: 15 May 2000; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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