Stabilized microporous crystalline material, the method of making the same, and the use for selective catalytic reduction of NOx

A method of making microporous crystalline material having a pore opening ranging from 3 to 5 Angstroms synthesized by a process free of organic structure directing agent (OSDA), where said material has molar silica to alumina ratio (SAR) ranging from 3 to 10 and comprises a first metal chosen from an alkali-earth group, a rare-earth metal chosen from lanthanum, praseodymium, neodymium and oxides thereof and mixtures thereof, an alkali group or mixtures thereof, and a second metal chosen from copper, iron or mixtures thereof, wherein first metal to aluminum atomic ratio is between 0.05 and 0.80, said method comprising:

• mixing sources of sodium, potassium, alumina, silica, water and optionally a crystalline seed material to form a gel, wherein said gel has potassium to silica (K/SiO2) molar ratio of less than 0.5 and hydroxide to silica (OH/SiO2) molar ratio less than 0.35;
• heating said gel in a vessel at a temperature ranging from 80° C. to 200° C. to form a crystalline product;
• ammonium-exchanging said product;
• and
• introducing first and second metals into said crystalline material by liquid-phase or solid ion-exchange, impregnation or incorporated by direct-synthesis.