常温常压下等离子体催化脱除空气中苯的研究

室内空气污染的问题日益突出,其中苯的危害尤为严重,不仅直接危害人类的神经及免疫系统,而且极易产生二次污染物,因此,脱除空气中的苯具有重大意义。本实验考对3种不同催化剂(MnO2、CeO2、CeO2载Ag)与等离子体结合脱除苯的催化活性选择,并且考察了放电电压、初始浓度、体系不同含水量等因素对对苯脱出率的影响,实验结果表明,CeO2以及Ag/CeO2对苯的分解效果明显。以CeO2作为催化剂在电压为18kV、苯的浓度为102×10-6时,苯的脱除率达到98.7%。等离子体与催化结合脱除苯的脱除率要大于单纯催化和单纯等离子脱除苯的脱除率的总和,证明了等离子体与催化剂之间产生了协同效应。

Study on plasma catalytic removal of benzene in air at atmospheric pressure and room temperature

Indoor air pollution problems have become increasingly prominent,which is particularly serious hazards of benzene,not only directly harmful to the human nervous and immune systems also easy to produce secondary pollutants,therefore,removal of benzene in the air is of great significance.In this experiment,catalytic activity choice of three different catalysts （MnO2,CeO2,CeO2 containing Ag） combined with plasma to remove benzene was tested on and the discharge voltage,the initial concentration,the different moisture contents of system and other factors which affect benzene removal rate were inspected,experimental results show,CeO2 and Ag/CeO2 have an obvious effect on the decomposition of benzene.With CeO2 a catalyst at a voltage of 18kV,the concentration of benzene was 102×10-6,the removal of benzene reached 98.7%.Removal rate of benzene with plasma and catalysis is greater than the total of simple plasma or catalytic removal rate of benzene,which proved that there is the synergistic effect between the plasma and the catalyst.