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Zeolites have played an important role as catalysts,adsorbents and ion-exchangers in a wide range of fields such as chemical/petrochemical industries and environment protection.[1] Direct conversion of nitrogen oxides(NOx)into N2 and O2 through ammonia selective catalytic reduction(NH3-SCR)on metal-exchanged zeolites was found to be a promising technique to abate the NOx emission from the diesel-fueled engines.