Reductive dechlorination of chlorobenzene in supercritical water catalyzed by Fe/ZrO₂.

Guang-Tao Wei; Chao-Hai Wei; Chao-Fei Wu; Feng-Mei He

Reductive dechlorination of chlorobenzene by Fe/ZrO2 in supercritical water was investigated. The effects of the operation conditions were studied. The dechlorination of chlorobenzene obeyed pseudo-first-order kinetics models. In supercritical water, the rate constant increases more rapidly with temperature than those in subcritical water. The results showed that the rate-determining step of dechlorination in subcritical water is diffusion; whereas the rate-determining of dechlorination in supercritical water is chemical reaction. The reaction mechanism in subcritical water might involve with an ionic mechanism; whereas the reaction mechanism in supercritical water might involve with a homolytic reaction.

CHLOROBENZENE; IRON; CHEMICAL reactions; WATER; ORGANOCHLORINE compounds

Environmental Chemistry Letters, 2010, Vol 8, Issue 2, p165

1610-3653

Academic Journal

10.1007/s10311-009-0204-3