Competition between TiCl[sub 4] hydrolysis and oxidation and its effect on product TiO[sub 2] powder
- Univ. of Cincinnati, OH (United States). Dept. of Chemical Engineering
The competition between hydrolysis and oxidation of TiCl[sub 4] during vapor-phase synthesis of titania powders was experimentally investigated. The effects of reactor temperature, reactant mixing and H[sub 2]O/TiCl[sub 4] ratio were studied in a hot wall aerosol flow reactor. The presence of water vapor resulted in rounded particles instead of the faceted ones observed in the absence of water; this effect was most pronounced at lower reactor temperatures. Mixing the water and TiCl[sub 4] vapor streams at low temperature resulted in anatase titania. Larger aggregates with smaller primary particles were observed for powders synthesized in the presence of water vapor. The mixing temperature of the water and TiCl[sub 4] vapors, as well as the H[sub 2]O/TiCl[sub 4] ratios, did not affect the aggregate size or specific surface area. Analysis of micrographs of titania aggregates made in the presence of water revealed that the fractal dimension increased with process temperature.
- OSTI ID:
- 7050852
- Journal Information:
- AIChE Journal (American Institute of Chemical Engineers); (United States), Vol. 40:7; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYST SUPPORTS
FABRICATION
SEMICONDUCTOR MATERIALS
TITANIUM CHLORIDES
HYDROLYSIS
OXIDATION
TITANIUM OXIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
SHAPE
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
DECOMPOSITION
HALIDES
HALOGEN COMPOUNDS
KINETICS
LYSIS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SOLVOLYSIS
SYNTHESIS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360601* - Other Materials- Preparation & Manufacture
400201 - Chemical & Physicochemical Properties