IMPROVED CATALYST BASED ON ZEOLITE FOR PRODUCING OLEFINS AND FOR OLIGOMERIZING OLEFINS

摘要

The invention relates to a novel catalyst based on zeolite, and the use of said catalyst in a method for producing lower olefins from oxygenates and in a method for oligomerizing olefins. The novel catalyst has a SiO₂/Al₂O₃ weight ratio of 2 to 9, a BET surface of 250 to 500 m²/g, and an Na content under 200 ppm, said catalyst comprising a crystalline alumosilicate zeolite and a binder. The catalyst is characterized in that the ratio of the peak heights of the IR absorption bands v=3610 cm^-1 ±20 cm^-1/ v=3680 cm^-1 ±20 cm^-1 is greater than 1.8.