| 简介 |
PROBLEM TO BE SOLVED : To provide a microporous crystalline material and NOx selective reduction catalyst inn an exhaust gas, having high water thermal stability.
SOLUTION : There is provided a microporous crystalline material having an aperture of 3 to 5Å, containing a first metal such as alkali earth and a second metal such as iron, having molar ratio of silica to alumina (SAR) of 3 to 10 and synthesized without using an organic structure directing agent. A crystal structure has a double 6-membered ring (d6r)basic unit and a 8-membered ring aperture and having a structure codes of CHA, LEV, AEI, AFT, EAB, ERI, KFI, SAT, TSC and SAV. There is provided a microporous crystalline material, where the first meta contain Mg, Ca, Sr, Ba, La, Ce, Pr, Nd, mixed rare earth oxide, K, Rb, Cs or a mixture thereof. There is provided a microporous crystalline material, where preferably atom ratio of the first metal is 0.05 to 0.80 and atom ratio of Ca is 0.05 to 0.50.
SELECTED DRAWING : None
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