脉冲放电等离子体-催化耦合降解室内甲醛的研究

摘要

利用脉冲放电等离子体-催化耦合技术,进行模拟室内空气循环降解甲醛的实验,对比了3种净化方式(紫外光催化、等离子体单独作用与等离子体-催化耦合)的甲醛降解效果,并考察了中心电极的极性、催化剂活性炭板与中心电极的距离对甲醛降解效果的影响.结果表明,相对单独的紫外光催化和等离子体作用而言,等离子体-催化耦合多重功效结合的甲醛降解效果更好,降解速率也更快；中心电极为正极的电场的甲醛降解效果优于中心电极为负极的电场；随着催化剂活性炭板与中心电极距离的不断扩大,直至板移动至电场外部的过程中,甲醛的降解率表现为先上升后下降的趋势,催化剂活性炭板与中心电极的距离存在一个最佳值,本研究的最佳距离为15mm.%The simulated experiments were carried out to removal formaldehyde from indoor air by corona induced plasma discharge combined with catalyst.The performance of three purify methods (single plasma,UV-photocatalysis and catalysis coupled plasma) on formaldehyde removal was compared.Result showed that the catalysis coupled plasma was superior to single plasma and UV-photocatalysis in formaldehyde removal.Through comparison experiments,the study focused on influence factors including distance between catalyst-plate and central electrode,central electrode polarity on results of catalysis coupled plasma.It was found that anode central electrode presented better treatment effect than cathode central electrode on formaldehyde removal;formaldehyde degradation also depended on the distance between catalyst-plate and central electrode,an optimum distance value of 15mm was observed in the experiment.