改性MFI分子筛对碳氢排放物吸附性能研究
Analyzing Effects of Modified MFI Zeolite on Adsorption Performance of Hydrocarbon Emissions

为了得到具有高效吸附性能的分子筛，以柴油机冷启动过程两种主要碳氢化合物为探针分子，利用蒙特卡洛分子模拟的方法，通过对MFI分子筛进行改性对HC化合物的吸附能力进行了研究。结果表明：改性之后的MFI分子筛对丙烯、乙烯的吸附量均有明显的增加，但对于乙烯的吸附效果更显著的。研究发现：随着硅铝比的减小，丙烯的吸附量随着温度的升高先减小再增大，而乙烯的吸附量则呈现逐渐增大的趋势，但总的来说，在硅铝比为23时分子筛对乙烯和丙烯的吸附量达到最大。
In order to obtain the MFI zeolite that has highly efficient adsorption properties, the Monte Carlo simulation and the hydrocarbon emissions in diesel cold start were used to simulate the effects of modified MFI zeolite on its adsorption performance. The experimental results demonstrate that the adsorption performances of both propylene and ethylene increase significantly, but the adsorption performance of ethylene is better. The study shows that with the decrease of the silica alumina ratio, the adsorption performance of propylene first decreases and then increases with the temperature rise and the adsorption performance of ethylene shows, on the whole, a trend of gradual increase when silica alumina ratio is 23, which is the largest adsorption performance of ethylene and propylene