微波辅助雷尼镍-铝合金催化剂催化1,4-二氯苯快速脱氯反应动力学研究

利用雷尼镍-铝合金催化剂的高催化活性,提出了使用微波辅助雷尼镍-铝合金催化1,4-二氯苯还原脱氯的方法。结果表明,在微波辅助雷尼镍-铝合金催化剂条件下,1,4-二氯苯还原脱氯的反应符合二级反应动力学方程。1,4-二氯苯脱氯的反应速率常数k1在35和50℃下分别为0.037 6和0.151 mol/(L.min),反应活化能为76.66 kJ/mol。研究还表明,在微波辅助雷尼镍-铝合金催化剂的条件下,35℃时,1,4-二氯苯10 min脱氯率达到90%,并且反应同时脱掉两个氯,能达到高效脱氯的目的。由此可知,微波辅助雷尼镍-铝合金催化脱氯的方法应用于多氯苯类物质脱氯取得良好的效果。

In-situ Rapid Dechlorination by Microwave-assisted Catalytic Reduction of Chlorobenzene and 1,4-dichlorobenzene on Raney Ni-Al alloy Catalyst

Microwave-assisted catalytic reductive dechlorination on Raney Ni-A1 alloy catalyst is an efficient method for chlorobenzene （CB） and 1,4-dichlorobenzene （1,4-DCB） treatment. The result showed that the Raney Ni-A1 alloy catalyst retains its high activity in this in-situ reduetive dechlorination reaction. This reductive dechlorination reaction was in accordance of the psendo-second-order reaction kinetics under microwave irradiation. The activation energy （Ea） was 76.24 kJ/mol. And the constant of 1,4-DCB dechlorination was 0. 037 6 （35℃ ） and O. 151 mol/（ L· rain） （50 ℃ ） , and the activation energy （Ea） was 76.66 kJ/mol. Rapid and complete deehlorination which was achieved for CB and 1,4-DCB was obtained at close to ambient conditions. And it was showed that microwave-assisted catalytic in-situ reductive dechlo- rination on Raney Ni-A1 alloy catalyst was an effective method to rapid and complete dechlorination for polychlorinated organic compounds.