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Title: Size effects in gas-phase photo-oxidation of trichloroethylene using nanometer-sized TiO{sub 2} catalysts

Abstract

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}.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Hong Kong Univ. of Science and Technology, Kowloon (HK)
OSTI Identifier:
20076102
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 192; Journal Issue: 1; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; CHLORINATED ALIPHATIC HYDROCARBONS; OXIDATION; PHOTOLYSIS; TITANIUM OXIDES; CATALYTIC EFFECTS; CATALYSTS; PARTICLE SIZE; MORPHOLOGY; INDOOR AIR POLLUTION; AIR POLLUTION CONTROL

Citation Formats

Maira, A.J., Yeung, K.L., Lee, C.Y., Yue, P.L., and Chan, C.K. Size effects in gas-phase photo-oxidation of trichloroethylene using nanometer-sized TiO{sub 2} catalysts. United States: N. p., 2000. Web. doi:10.1006/jcat.2000.2838.
Maira, A.J., Yeung, K.L., Lee, C.Y., Yue, P.L., & Chan, C.K. Size effects in gas-phase photo-oxidation of trichloroethylene using nanometer-sized TiO{sub 2} catalysts. United States. doi:10.1006/jcat.2000.2838.
Maira, A.J., Yeung, K.L., Lee, C.Y., Yue, P.L., and Chan, C.K. Mon . "Size effects in gas-phase photo-oxidation of trichloroethylene using nanometer-sized TiO{sub 2} catalysts". United States. doi:10.1006/jcat.2000.2838.
@article{osti_20076102,
title = {Size effects in gas-phase photo-oxidation of trichloroethylene using nanometer-sized TiO{sub 2} catalysts},
author = {Maira, A.J. and Yeung, K.L. and Lee, C.Y. and Yue, P.L. and Chan, C.K.},
abstractNote = {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}.},
doi = {10.1006/jcat.2000.2838},
journal = {Journal of Catalysis},
issn = {0021-9517},
number = 1,
volume = 192,
place = {United States},
year = {2000},
month = {5}
}