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以甲苯为目标污染物,采用活性炭做吸附剂对含甲苯废气进行吸附;吸附完成后利用微波辐照进行解吸;另外采用浸渍法制备Cu-Mn复合氧化物催化剂并对微波解吸后的废气进行催化燃烧处理从而达到对污染物进行彻底净化的目的.实验中甲苯的浓度由气相色谱(GC)测定.结果表明,采用微波解吸后,在以氮气为载气的解吸气体中加入空气来提供氧气从而实现催化燃烧是可行的,解吸气与空气配比为1∶1(体积比)时效果最好,此时对应的催化空速为2.67 s-1.解吸温度会影响解吸气体中的甲苯浓度进而影响催化燃烧效率,实验结果表明400℃解吸比较理想.当催化燃烧温度保持在300℃时,系统对甲苯的最终净化效率可以维持在90%以上,其中大部分时间是在95%以上.
Toluene was taken as the target pollutant. Activated carbon was used as adsorbent to adsorb the toluene-containing waste gas. After the adsorption was completed, the sample was desorbed by microwave irradiation. In addition, Cu-Mn composite oxide catalyst was prepared by impregnation and catalyzed by microwave desorption Combustion process so as to achieve the purpose of thorough purification of pollutants.The concentration of toluene in the experiment was determined by gas chromatography (GC) .The results showed that after desorption by microwave, air was added to desorbed gas with nitrogen as carrier gas to provide oxygen Catalytic combustion is feasible, and the best effect is obtained when the ratio of desorption gas to air is 1: 1 (volume ratio), and the corresponding catalytic space velocity is 2.67 s-1. The desorption temperature will affect the concentration of toluene in the desorbed gas The experimental results show that the desorption at 400 ℃ is ideal.When the catalytic combustion temperature is maintained at 300 ℃, the final purification efficiency of toluene system can be maintained above 90%, most of which is over 95%.