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钯铁双金属体系还原脱氯水中二氯苯同分异构体

Keywords: 钯/铁双金属,零价铁,还原脱氯,二氯苯

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Abstract:

采用Pd/Fe双金属体系在常温常压下对二氯苯的3种同分异构体进行了快速催化还原脱氯的研究。通过原始污染物和产物的变化,重点考察取代基位置以及pH值等因素对脱氯反应的影响。结果表明,反应条件一致时,氯取代基位置对脱氯有一定的影响。还原脱氯的速率1,2-DCB>1,3-DCB>1,4-DCB。酸性环境有利于二氯苯脱氯。二氯苯在催化脱氯的过程中依次脱氯成为氯苯和苯。当二氯苯类化合物浓度约为0.45mmol·L-1,0.03%Pd/Fe加入量为1g·40mL-1氯苯,25 ℃条件下,经过90min反应,3种二氯苯的还原率均在80%以上。

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