低温等离子体协同催化降解废气污染物的研究进展

Research on degradation of waste gas pollutants by combining non-thermal plasma with catalysis

阐述了低温等离子体协同催化工艺流程与反应机理,探讨了反应温度、废气进口组分、废气中水蒸气含量、气体流速、气溶胶等因素对降解效果的影响。分析认为:一段式低温等离子体协同催化可改变低温等离子体特征及催化剂催化特性,但尚未解决尾气臭氧逃逸、副产物产生及放电稳定性等问题;两段式低温等离子体协同催化可提高污染物分子降解效率并减少尾气臭氧逃逸,但未能有效利用等离子体的能量,气体中的水蒸气、粉尘及反应过程中产生的气溶胶均能影响后置催化剂的催化性能;两段式低温等离子体协同催化已具备工程应用条件,还需配套高效预处理单元以降低废气中水蒸气、粉尘等对催化剂的影响。

The process flow and mechanism of a non-thermal plasma(NTP)synergistic catalysis process was summarized.The influences of several factors on the degradation effect was discussed,such as reaction temperature,the components of input exhaust gas,moisture content,gas flow rate and aerosols.The results show that one-stage NTP synergistic catalysis can change the characteristics of NTP and catalytic agents,but cannot solve the problems of the escape of ozone,the generation of by-products,and unstable discharge.Two-stage NTP synergistic catalysis can increase the degradation efficiency of pollutants and reduce the escape of ozone,but cannot effectively utilize the energy of NTP.In addition,moisture,dust and aerosols will influence the post-catalytic agent.Two-stage NTP synergistic catalysis process has satisfied the requirements of engineering application,but still need a effective pretreatment unit to reduce the impacts of the moisture and dust.