纳米TiO_2含量对汽车尾气因子降解效能影响试验研究

Degradation Efficiency of Different Density Nano-TiO_2 on the Factors of Automotive Emission

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%。

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.