纳米Ti02含量对汽车尾气因子降解效能影响试验研究

研制汽车尾气降解材料测试室，测试以超声波分散法制备的不同含量的5种纳米TiO2光催化材料，对汽车尾气因子的降解效能。选用车辆处于怠速工况下所排出的汽车尾气为试验样本，依据纳米光催化材料降解率计算公式，计算出不同含量的纳米TiO2光催化材料对汽车尾气中有害因子NOx、HC、CO的平均降解率。测试结果表明：纳米TiO2光催化材料对汽车尾气中NOx、HC、CO等因子具有一定的影响效能，且降解趋势一致。不同含量的纳米TiO2光催化材料，对汽车尾气中各因子的影响效能随时间的变化降解率不同；对应于汽车尾气因子NOx、HC、CO具有最佳降解效能的纳米TiO2光催化材料的含量分别为4％、2％、4％。

Degradation Efficiency of Different Density Nano-TiO2 on the Factors of Automotive Emission

The testing chamber with degrading materials on automobile emission is developed to test the degradation efficiency on the automobile emission factors with five different densities Nano-TiO2 obtained by supersonic dispersion methed,The emission sample is collected when the vehicle is on idle.The mean degradation efficiencies of the Nano-TiO2 materials on NOx, HC, CO are calculated according to the formula of degradation efficiency. The experiments show that the Nano-TiO2 materials have certain influences on NOx HC, CO and the trends of the degradations are same.The degradation efficieneies of different Nano-TiO2 material densities on NOx, HC, CO differ as the time change.The optimum density of Nano-TiO2 of degrading NOx, HC, CO in automotive emission is 4%, 2%, 4% respectively. The Nano-TiO2 has efficiency degradation on NOx, but negative to HC and CO.