低温等离子体催化处理甲苯气体

Catalytic removal of toluene combined with low temperature plasma

将低温等离子体与贵金属催化剂结合,用于甲苯气体的处理;考察了其处理效果及影响因素。所用低温等离子体由针板式脉冲流光放电方法产生。实验考察了脉冲频率、脉冲峰值电压、甲苯进口质量浓度、气体流量和催化剂等因素对净化效率的影响。结果表明:甲苯去除率随脉冲频率和脉冲峰值电压的变化并非单方向增大或减小,而是分别存在最适宜值f=33kHz、U=15kV;甲苯进口质量浓度从60mg/m3增加到180mg/m3时,甲苯去除率逐渐升高;气体流量的增大会导致甲苯去除率的降低;贵金属催化剂对甲苯降解有明显的促进作用,无催化剂时甲苯去除率的最大值为57.3%,有催化剂时则提高到88.5%。

Removal of toluene was investigated via noble metal catalysts combined with low temperature plasma.The low temperature plasma used was produced by pulsed streamer discharge with needle-board.Toluene removal efficiency was investigated by variation in experimental parameters,such as pulse frequency,pulse peak voltage,inlet toluene concentration,gas flow rate and catalysts.Results indicated that the toluene removal efficiency was not simply increased or decreased with pulse frequency and pulse peak voltage,optimum values were found as f = 33 kHz and U = 15 kV,respectively.When inlet toluene concentration was increased from 60 to 180 mg/m^3,the removal efficiency was increased gradually.The increase in gas flow rate would lead to the decrease in removal efficiency.Noble metal catalysts showed an obvious promoting effect for toluene degradation,the maximum values of toluene removal efficiency were 57.3% without a catalyst and 88.5% with a catalyst.