ガソリン機関の排気中未燃焼炭化水素の吸着浄化システム : 第1報, Si/2 Al比, H_2OおよびHC種と吸着・脱離特性

概要

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Exhaust gas temperatures of automotive gasoline engines are not high enough for catalysts to activate under cold start conditions and unburned hydrocarbons are abundantly emitted to the atmosphere without being oxidized. This study was conducted to develop an aftertreatment system to reduce HC emissions using zeolite to store HC at low temperatures. Model gas tests, to examine the adsorption and desorption characteristics of zeolites, were performed using C_3H_6 and C_7H_8 as typical HC species in the exhaust gas. From the FTP vehicle test, it was found that H_2O molecules in the exhaust gas suppress HC adsorption, and zeolites with high Si/2 Al ratios are effective to store HC, but tend to desorb HC readily. These results showed good agreement with predictions derived from model gas test.
一般社団法人日本機械学会の論文
1996-04-25