Long-lifetime sapo-34 catalyst prepared from mto waste catalyst as raw material and method for preparation thereof

A method for preparing a long-lifetime SAPO-34 catalyst from waste MTO catalyst as a raw material, comprising the steps of:

• (1) mixing the waste MTO catalyst fine powder with water and stirring them for a period of time to obtain a first mixture;
• (2) adding phosphoric acid and an organic amine to the first mixture obtained in step (1) and stirring them for a period of time to obtain an initial gel mixture for SAPO-34 molecular sieve;
• (3) crystallizing the initial gel mixture for SAPO-34 molecular sieve obtained in step (2) and then at least drying it to obtain rawSAPO-34 molecular sieve powder;
• (4) calcining the raw SAPO-34 molecular sieve powder obtained in step (3) to obtain SAPO-34 molecular sieve powder;
• (5) mixing the SAPO-34 molecular sieve powder obtained in step (4) with a binder and a matrix carrier in water with stirring, and then aging the resultant by standing it for a period of time to obtain a second mixture;
• and
• (6) molding the second mixture obtained in step (5) and then calcining the resultant to obtain the long-lifetime SAPO-34 catalyst.