MAINTAINING MOLECULAR SIEVE CATALYTIC AVTIVITY UNDER WATER VAPOR CONDITIONS

摘要

THE INVENTION IS DIRECTED TO METHODS FOR PROTECTING METALLOALUMINOPHOSPHATE MOLECULAR SIEVES, PARTICULARLY SILICOALUMINOPHOSPHATE (SAPO) MOLECULAR SIEVES, FROM LOSS OF CATALYTIC ACTIVITY DUE TO CONTACT WITH A GAS CONTAINING WATER. THE METHODS OF THE INVENTION PROVIDE PROCEDURES THAT ENABLE ACTIVATED SIEVE TO CONTACT WATER VAPOR, WITHIN A CERTAIN RANGE OF TIME TEMPERATURE, AND WATER PARTIAL PRESSURE CONDITIONS, BEFORE THE SIEVE BECOMES SUBSTANTIALLY DEACTIVATED.