Dechlorination mechanism and kinetic of 2,4-DCP by nanoscale Pd/Fe system
纳米Pd/Fe双金属对2,4-二氯酚的脱氯机理及动力学

Nanoscale Pd/Fe bimetallic catalysts were synthesized via chemical deposition and used to decompose 2,4-DCP. Nanoscale particles were characterized by high surface area to volume ratios and high reactivity. Batch experiments demonstrated that the nanoscale Pd/Fe particles could effectively dechlorinate 2,4-DCP at relatively low metal to solution ratio (6g·L-1), Dechlorination efficiency reached 90% at Pd weight ratio (Pd to Fe) 0.11%. Dechlorination was affected by reaction temperature, pH, Pd ratio and the addition of nanoscale Pd/Fe.2-CP and 4 CP represent stable partially dechlorination intermediates, and then phenol. Some 2,4-DCP was dechlorinated to phenol indirectly. The dechlorination was believed to take place on the surface of the nanoscale Pd/Fe bimetallic particles via a pseudo-first order reaction,the activation energy was found to be 139.7kJ·mol-1.