Pd基双金属催化剂对2,4-D的液相催化加氢脱氯

以CeO₂为载体，采用浸渍法分别合成了负载型Pd基催化剂（Pd/CeO₂，Pd-Fe/CeO₂，Pd-Co/CeO₂和Pd-Cu/CeO₂），并用于水中2，4-二氯苯氧乙酸的催化加氢脱氯.使用等离子体发射光谱仪、扫描电子显微镜和X-射线光电子能谱仪和CO化学吸附对材料进行表征.结果表明，CeO₂作为载体可有效分散金属颗粒，双金属间的协同作用改善了其催化性能.其中Pd-Fe双金属催化剂具有相对优异的催化效果，随着Fe负载量的增加，Pd-Fe/CeO₂的催化活性先升后降.2，4-二氯苯氧乙酸的催化脱氯以同步脱氯和逐步脱氯2种方式同时进行.

Liquid phase catalytic hydrodechlorination of 2, 4-dichlorophenoxyacetic acid over Pd-M(M=Fe,Co, Cu) bimetallic catalysts

Supported bimetallic catalysts Pd-M/CeO₂(M=Fe, Co, Cu) were prepared by the impregnation method and the liquid phase catalytic hydrodechlorination (HDC) of 2,4-dichlorophenoxyacetic acid (2,4-D) was investigated over these catalysts. The catalysts were characterized by inductive coupled plasma optical emission, scanning electron microscope, X-ray photoelectron spectrometer and CO chemisorption. The results showed that cerium oxide could effectively disperse metal particles, and the synergy between metals improved catalytic performance. The Pd-Fe bimetallic catalyst has a relatively excellent catalytic effect. The catalytic activity of Pd-Fe/CeO₂ increased first and then decreased with the increase of Fe loading. In addition, the dechlorination of 2,4-D were proceeded via both the stepwise and concerted pathways.