FIELD: chemistry.
SUBSTANCE: composition includes a crystalline structure. At least, a portion of this crystal structure is a molecular sieve with a chabasite framework consisting of thirty six T-atoms selected from group consisting of silicon, aluminium and phosphorus. The said molecular sieve comprises about 0.05 to about 5.0 mole % of phosphorus contained in phosphorus frame relative to the total moles of silicon, aluminium and phosphorus in said molecular sieve. And, the said molecular sieve is characterized by a molar ratio of silicon oxide to aluminium oxide of, at least, about 10. The invention also relates to catalytically active primer, a catalytically active article, a NOx reduction method in the exhaust gas and the engine exhaust gas processing system.
EFFECT: improving hydrothermally stable moecular sieves with small pores that have a high degree of catalytic activity.
15 cl, 4 dwg, 3 tbl, 5 ex
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