Economic efficiency and emission performance of lean combustion gasoline engine are significantly impacted by the contents of CO_2 and vapor.Modeling of NOxadsorption process is conducted considering the ash core model theory.The experimental data are set as the inlet boundary conditions,and the adsorption process with CO_2,vapor or the both is analyzed.Following the original adsorption mechanism of the added BaO and Ba(OH)2in the process,three kinds of catalysts,i.e.,Bao,Ba(OH)_2and BaCO3,are investigated ...