Pd基双金属催化剂对2,4-D的液相催化加氢脱氯  

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

作　　者：周鑫[1] 罗豪鹏 王唯 陈泉源[1] 周娟[1] ZHOU Xin;LUO Hao-peng;WANG Wei;CHEN Quan-yuan;ZHOU Juan(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学环境工程系

出　　处：《中国环境科学》2019年第10期4337-4342,共6页China Environmental Science

基　　金：中央高校基本科研业务费资助项目(2232018D3-43,2232015DZ1-01);东华大学研究生创新基金资助项目(GSIF-DH-M-2019007)

摘　　要：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.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.

关 键 词：2 4-二氯苯氧乙酸 催化加氢还原 双金属 Pd-Fe/CeO2 

分 类 号：X505[环境科学与工程—环境工程]