基于光催化的汽车尾气自收集降解技术

康宪章¹，赵之仲^1*，隋明言²，梁浩³，薛军⁴，刘芝敏⁵

1.山东交通学院交通土建工程学院，山东 济南  250357；2.华设设计集团北京民航设计研究院有限公司，北京  101300；

3.山东鲁中公路建设有限公司，山东 淄博  255086；4.山东省路桥集团有限公司，山东 济南  250014;

5.济南金曰公路工程有限公司，山东 济南  250101

摘要：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TiO₂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TiO₂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TiO₂质量浓度和尾气流速的增大先增大后减小；纳米TiO₂的质量浓度为40 g/m³，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。

关键词：纳米TiO₂；光催化；汽车尾气；NO降解

Self-collection and degradation technology of automotive exhaustbased on photocatalysis

KANG Xianzhang¹, ZHAO Zhizhong^1*, SUI Mingyan², LIANG Hao³, XUE Jun⁴, LIU Zhimin⁵

1.School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;

2.Beijing Civil Aviation Design and Research Institute Co., Ltd., China Design Group, Beijing 101300, China;

3.Shandong Luzhong Highway Construction Co., Ltd., Zibo 255086, China;

4.Shandong Luqiao Group Co., Ltd., Jinan 250014, China;

5.Jinan Kingyue Highway Engineering Co., Ltd., Jinan 250101, China

Abstract: In order to analyze the key indicators of photocatalytic degradation of automobile exhaust technology and improve the efficiency of automobile exhaust degradation, nano-TiO₂is 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-TiO₂mass 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-TiO₂ mass concentration and exhaust flow rate; The degradation efficiency of NO is maximum when the mass concentration of nano-TiO₂ is 40 g/m³ 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.

Keywords: nano-TiO₂; photocatalysis; automobile exhaust; NO degradation