No Decomposition on Cu-Incorporated A-Zeolites under the Reaction Condition of Excess Oxygen with a Small Amount of Hydrocarbons

Summary Copper containing A-type zeolites which contained copper with considerably high concentrations were synthesized through crystallization. It was confirmed that Cu + ions in the crystals could be stably maintained compared with those in the copper-loaded samples prepared by an ion-exchanged method. NO decomposition activity on the Cu-A catalyst corresponded to the capacity of redox response. Even under an excess oxygen condition the NO decomposition progressed smoothly at around 300 – 350° by the addition of a very small concentration of n-C 8 - n-C 16 saturated hydrocarbons. Especially cetane (n-C 16 ) exhibited the marked effect, and NO was decomposed completely at that temperature range. To explain these unusual non-linear reaction phenomena, Microscopic Sequential Reaction mechanism was proposed and the necessary conditions to realize this mechanism were discussed.