Chlorinated byproducts from the photoassisted catalytic oxidation of trichloroethylene and tetrachloroethylene in the gas phase using porous TiO2 pellets
✍ Scribed by Suzuko Yamazaki-Nishida; Xianzhi Fu; Marc A. Anderson; Kenzi Hori
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 464 KB
- Volume
- 97
- Category
- Article
- ISSN
- 1010-6030
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✦ Synopsis
The photocatalytic degradation of trichloroethylene and tetrachloroethylene in the gas phase, when porous TiO2 pellets were used. produced such undesirable chlorinated byproducts as chloroform (CHC13) and carbon tetrachloride (CC14). The formation of byproducts was reduced by increasing oxygen mole fractions in the feed gas stream and/or using the TiO2 pellets fired at a lower temperature. Theoretical calculations indicate that the Cl-radical-initiated reaction produces these byproducts. On the basis of the experimental and the theoretical results, a method to prevent the formation of the chlorinated byproducts is discussed.