基于光催化的汽车尾气自收集降解技术

Self-collection and degradation technology of automotive exhaust based on photocatalysis

为分析光催化降解汽车尾气技术的关键指标,提高汽车尾气降解效率,以纳米TiO_(2)为催化剂,设计室内自收集式汽车尾气降解试验,以流动的汽车尾气为试验源,NO为指标气体,分析不同纳米TiO_(2)质量浓度、尾气流速、温度及紫外线辐照度对汽车尾气中NO降解效率的影响。试验结果表明:汽车尾气中NO的降解效率随纳米TiO_(2)质量浓度和尾气流速的增大先增大后减小;纳米TiO_(2)的质量浓度为40 g/m^(3),尾气流速为2.5 m/s时,NO的降解效率最大;室内自收集式汽车尾气降解试验受外界环境影响小,温度和紫外线辐照度小范围变化对NO降解效率影响较小。

In order to analyze the key indicators of photocatalytic degradation of automobile exhaust technology and improve the efficiency of automobile exhaust degradation,nano-TiO_(2)is used as a catalyst,and an indoor self-collection automobile exhaust degradation test is designed.Flowing automobile exhaust is used as the test source,and NO is used as the index gas to analyze the effects of different nano-TiO_(2)mass concentrations,exhaust flow rates,temperatures,and ultraviolet irradiance on the degradation efficiency of NO in automobile exhaust.The experimental results show that the degradation efficiency of NO in automobile exhaust increases first and then decreases with the increase of nano-TiO_(2)mass concentration and exhaust flow rate;The degradation efficiency of NO is maximum when the mass concentration of nano-TiO_(2)is 40 g/m^(3)and the exhaust flow rate is 2.5 m/s;The indoor self-collecting automobile exhaust degradation test is less affected by the external environment,and the temperature and ultraviolet irradiance has little effect on the degradation efficiency of NO.