Abstract: The adsorption and desorption performance of different zeolites, such as ZSM-5, 13X, SAPO, Y, β, and A, for NO and NO2 at 40 ℃ was investigated in the absence and presence of 10%O2 in 0.02%NO/N2. The TPD results of NO and NO2 revealed that adsorption of NO on the zeolites, especially on sodium form ones, could be substantially increased by the presence of oxygen owing to the co-adsorption of NO and NO2. Among the zeolites tested, Hβ showed the largest capacity for NO adsorption under the conditions without oxygen, whereas 13X zeolite displayed outstanding behavior for NOx adsorption under the conditions with oxygen.

Key words: nitric oxide, nitrogen dioxide, adsorption, desorption, zeolite