Adhesive-free zeolithic granulate with faujasite structure and method for producing such an adhesive-free zeolithic granulate and use of same

摘要

Binder-free zeolite granules exhibiting faujasite structure, a molar ratio of silicon dioxide to aluminum oxide of greater than 3, a particle size of less than 400 mu m, an average transport pore diameter of greater than 150 nm, a mesopores proportion of less than 15%, preferably less than 10%, and a mechanical stability, which allows direct use or further processing, is claimed. Independent claims are also included for: (1) preparing the binder-free zeolite granules, comprising (i) mixing thermally treated kaolin having a non-kaolinitic material (= 5 wt.%), and a zeolite of type NaY exhibiting a molar ratio of silicon dioxide to aluminum oxide of greater than 3, as a dry powder, cake or slurry, in a mass ratio of 1:1-1:9, preferably 1:3.5-1:7, based on the anhydrous material of the starting materials, (ii) mixing the obtained mixture with a low viscosity sodium hydroxide solution and molding into granules, (iii) drying the granules at 10-100[deg] C, (iv) soaking in water and aging in a sodium silicate solution, (v) treating with the sodium silicate solution at 75-100[deg] C for 1-48 hours, and (vi) separating the treated granules from the solution, washing, drying and heating, where the makes use of sodium oxide to silicon dioxide ratio of 0.15:0.5, silicon dioxide to aluminum oxide ratio of 3.5: 9.3, and water to sodium oxide ratio of 10:100; (2) an adsorbent comprising the above binder-free zeolite granules; and (3) a catalyst or catalyst component comprising the granules.