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Catalytic reductive dechlorination of monochlorobenzene(MCB) was carried out in the palladium/iron system. With low Pd loading(0.005%), 45% dechlorination efficiency was achieved within 5 h Pd as catalyst accelerated the reductive dechlorination reaction. Dechlorination mechanism and kinetics were discussed. The reaction took place on the bimetal surface in a pseudo-first-order reaction, with the rate constant being 0.0071 min-1(KSA=8.0(10-3 L/(m2@h). The reduction product for MCB was benzene.