Trichloroethylene (TCE) was decomposed in a gas flow-type reactor with an ultraviolet light source, in which TiO
2/silica gel photocatalyst of 3 mm? in the mean particle diameter was packed. The decomposition ratio of TCE and the extent of formation of CO
2 and HCl were determined by changing various experimental conditions such as total gas flow rate, reaction temperature, catalyst weight and content of water vapor.
It was found that, in the photocatalytic decomposition of TCE, it was decomposed to products CO
2 and HCl via the formation of intermediates such as CHCl
3, COCL
2 and CCl
4. The decomposition ratio of TCE and the extent of formation of CO
2 and HCl were constant with 4.5 g photocatalyst at 303.2 K in a gas flow rate below 200 cm
3. min
-1. The amount of TCE decomposed was increased with an increase in the amount of photocatalyst charged in the reactor. The decomposition ratio of TCE and the extent of formation of CO
2 and HCl were increased with an addition of 1% content of water vapor. It was also found that the decomposition ratio of TCE was slightly decreased with an elevation of reaction temperature from 303.2 K to 338.2 K, but the extent of formation of CO
2 and HCl was greatly increased at 338.2 K compared with 303.2 K.
抄録全体を表示