铜基改性活性炭吸附争化黄磷尾气中的PH3

摘要

采用浸渍法制备铜基改性活性炭吸附净化磷化氢气体,主要考察活性组分、氧含量、吸附温度、空速对磷化氢吸附穿透曲线的影响,并研究磷化氢在铜基改性活性炭上的动力学过程.研究结果表明:经过含有Cu,Fe和Ce物质的量比为20.0:1.0:0.4的混合改性液负载后,Cu-Fe-Ce/AC对PH3的吸附容量最大可达62 mg/g;铜基改性活性炭的最佳反应条件为:吸附温度70℃,氧含量(体积分数)3%,空速3 000 h-1.在最佳反应条件下,铜基改性活性炭对磷化氢净化效率为100%时的最大累积处理气量可达0.055 m3/g;磷化氢在Cu-Fe-Ce/AC吸附剂上的平均活化能为30.9 kJ/mol,为-0.2级反应;随着吸附容量的增大,吸附活性位逐渐减少,从而使吸附速率减小.%The Cu-based modified activated carbons prepared by impregnation were used for adsorbents of PH3 purification.The effects of oxygen concentration, adsorption temperature and space velocity on phosphine adsorption breakthrough curve were studied.And the kinetics process of PH3 adsorption on the Cu-based modified activated carbon was also analyzed.The results show that the maximum of phosphine adsorption capacity is 62 mg/g when the molar ratio of Cu, Fe and Ce is 20.0:1.0:0.4.The optimum parameters of adsorptive reaction are oxygen concentration of 3％,adsorption temperature of 70 ℃, and space velocity of 3 000 h-1.At the optimum parameters, the maximum handling capacity is up to 0.055 m3/g.The average activation energy is 30.9 kJ/mol and the order of reaction is -0.2 for PH3 on the Cu-based modified activated carbon.