Experimental Study On The Processing Of Chlorobenzene Emissions By Catalytic Reduction In The Liquid Phase

Chlorinated organic compounds have been used on a large scale, almost all of which are toxic and thermally stable. In this paper, the absorption accompanied by chemical reaction of chlorobenzene had been investigated in different system, such as zero valent iron system, Ni/Fe bimetal system, Pd/Fe bimetal system and US/Fe system. Several important experiment parameters involved in this process were studied, including initial pH, reaction temperature, exhaust gas concentration, Ni loading and Pd loading. The absorption process of four systems were compared from different angles.The results showed that, the absorption process could be improved under the condition of lower initial pH, lower temperature, higher concentration of chlorobenzene, higher Pd loading and higher Ni loading. Adding bimetal and ultrasonic condition in the absorption solution could accelerate the removal rate of chlorobenzene. Pd/Fe bimetal, Ni/Fe bimetal and US/Fe systems indicated higher reactivity in comparison of Fe system. The former had faster dechlorination rate. The absorption process could be improved obviously by the reductive dechlorination reaction. Pd/Fe bimetal and Ni/Fe bimetal had higher absorption rate than Fe. Pd/Fe bimetal system had the highest absorption rate at the same amount of absorbed chlorobenzene. When 20 mg of chlorobenzene had been absorbed, the absorption rate of Pd/Fe was 1.8 times of Fe and the absorption rate of Ni/Fe was 1.6 times of Fe.