An ultra-stable rare earth type molecular sieve and preparation method y

The present invention provides a rare earth zeolite Y and ultrastable preparation method, the method is based on NaY zeolite as the raw material, the reaction and dispersion of rare earth exchanged pre-exchange reaction, ultra-stable finally calcined. The rare earth oxide-containing molecular sieve of 1 to 20 weight%, sodium oxide, no greater than 1.2 weight%, a crystallinity of 51 to 69%, unit cell parameters 2.451nm ~ 2.469nm; Compared with the prior art, a molecular sieve prepared by the rare earth ions positioning method in the sodalite cages, rare earth ions exhibit no loss in the anti-exchange process, while the molecular sieve prepared by this method particle diameter D (v, 0.5) no greater than 3.0μm, D (v, 0.9) no greater than 20μm. With this molecular sieve as a catalytic cracking catalyst active component, it has the characteristics of high capacity and high value heavy oil conversion object product yield.