| abstract |
a microporous crystalline material having a molar ratio of silica to alumina (sar) ranging from 10 to 15 and a fraction of al in the zeolite structure of 0.63 or more is revealed. a method of selective catalytic reduction of nitrogen oxides in exhaust gas, which comprises putting the exhaust gases in contact, typically in the presence of ammonia, urea, an ammonia-generating compound, or a hydrocarbon compound, with an article comprising the lens revealed microporous is also revealed. in addition, a method for making the disclosed microporous crystalline material is disclosed. |