常温常压下等离子体催化脱除空气中的苯

苯是典型的室内空气污染物,严重影响人体健康。在大气压及35℃下,通过在催化剂上进行介质阻挡放电的方式,进行了等离子体-催化氧化脱除空气中苯的研究。当气体中C6H6的体积分数为103.5×10-6、H2O的体积分数为1.0%、空气为平衡气,输入能量密度为114 J/L,空速为16 500 h-1时,苯的脱除率可达93.5%。而在同样实验条件下,单纯等离子体脱除苯和单纯催化氧化脱除苯的脱除率分别为62.8%和9.0%。这一实验结果说明,等离子体与Ag/CeO2催化剂在催化氧化空气中苯的过程中产生了协同效应,等离子体产生的活性自由基在Ag/CeO2催化剂催化氧化苯的氧化-还原循环过程中起到了至关重要的作用。

Plasma-catalytic removal of benzene from atmospheric pressure air at normal temperature

Aimed at addressing benzene(C6H6),a typical indoor air pollutant threatening to cause serious health disorders in human beings,this paper reports plasma-catalytic oxidation of benzene in gas streams via dielectric barrier discharges over Ag/CeO2 pellets at atmospheric pressure and 35 ℃.A feed gas mixture of 103.5×10-6 C6H6,1.0% H2O in air,GHSV of 16 500 h-1,and input discharge energy density of 114 J/L contribute to the benzene removal rate of 93.5%.But the same experimental conditions yield the benzene removal rate of 62.8% and 9.0% respectively for pure plasma-induced oxidation and for pure catalytic oxidation over Ag/CeO2(without discharges).The results imply that there occur synergistic effects between the plasma and Ag/CeO2 catalyst in C6H6 oxidation,and the plasma-generated active radicals,such as O and HO2,play important roles in the catalytic redox circles of Ag/CeO2 to oxidize C6H6.