TREATMENT OF SMALL PORE MOLECULAR SIEVES AND THEIR USE IN THE CONVERSION OF OXYGENATES TO OLEFINS

摘要

A method is disclosed of treating a porous crystalline molecular sieve having a pore size less than or equal to about 5 Angstroms to decrease its coke selectivity in oxygenate to olefin conversion reactions. The method comprises contacting the molecular sieve with an acid having a kinetic diameter greater than or equal to that of acetic acid.