关键词: 甲醇；硅胶吸附管；穿透率

Abstract: In this paper, the method of using silica gel adsorption tube to collect methanol from automobile exhaust emissions was researched, the specifications of silica gel adsorption tubes, the concentration of samples to be tested, the sampling parameters and so on were discussed and verified in detail. The study showed that the methanol was easy to penetrate in the process of collecting methanol with silica gel adsorption tube. With the increase of silica gel particle loading, the penetration rate of methanol decreased, and the actual adsorption efficiency of methanol increased. At the same sampling flow rate, the higher the concentration of the sample to be tested, the higher the methanol penetration rate. At the same concentration of the sample to be tested, the higher the collection flow rate, the higher the methanol penetration rate. The silica gel adsorption tube in series can effectively reduce the penetration of methanol and improve the adsorption efficiency.

Key words: Methanol; Silica gel adsorption tube; Penetration rate