Mesoporous nanocrystaline zeolite composition and preparation from amorphous colloidal metalosilicates

Abstract

Mesoporous ZSM compositions and methods of preparing same are provided. The starting material is an amorphous metallosilicate which is processed into ZSM-type nanocrystals. Upon calcinations, meso-ZSM-nanaocrystals are prepared.

1 . A mesoporous ZSM-type material characterized by a stereoregular arrangement of uniformly-sized mesopores walls and a microporous nanocrystalline structure.  
     
     
         2 . A mesoporous ZSM-type material having a stereoregular arrangement of uniformly-sized mesopores walls prepared by: 
 (a) forming a template occluded primary amorphorous metal-doped silicate particles;    (b) aggregating the particles of step (a) into mesoscopic colloidal material;    (c) processing the material of step (b) into ZSM nanocrystals; and    (d) removing the template of step (a) to form the ZSM type material.    
     
     
         3 . The ZSM of  claim 2 , wherein metal is aluminum.  
     
     
         4 . A mesoporous ZSM-type material having a stereoregular arrangement of uniformly-sized mesopores walls formed from silicalite and a microporous nanocrystalline structure, wherein said ZSM-type material is ZSM-5 zeolite.  
     
     
         5 . A method of preparing mesoporous ZSM-type material from cationic metallosilicate primary particles, said metallosilicate primary particles prepared by a method comprising (a) processing a stabilizer-containing heel solution and a silicic acid solution to form a silica colloidal composition; (b) heating the silica colloid structure of step (a) at a temperature and for a period of time sufficient to cause transformation of the silica structure into microporous ZSM nanocrystals, and (c) generating the meso-ZYM-type material comprising micropores and mesopores by calcination.  
     
     
         6 . The method of  claim 5 , wherein the meso-ZYM-type material is ZSM-5 zeolite.  
     
     
         7 . The meso-ZYM-type material of  claim 1 , useful as a catalyst in high surface area material.  
     
     
         8 . The meso-ZYM-5 material of  claim 5 , useful as a catalyst in high surface area material.