High-yield synthesis of nanozeolite y crystals of controllable particle size at low temperature

Abstract

The present application relates to a method for synthesizing nanozeolite Y crystals, nanozeolite Y crystals obtainable by said method, and the use of the synthesized nanozeolite Y crystals in cracking hydrocarbons, as molecular sieves or as ion-exchangers.

1 - 17 . (canceled) 
     
     
         18 . Nanozeolite Y crystals obtainable by a method comprising the following steps:
 a) preparing a first aqueous solution comprising a silicate source and quinuclidine;   b) preparing a second aqueous solution comprising an aluminate source and an alkali hydroxide;   c) combining the first and the second aqueous solution to obtain an aqueous reaction mixture;   d) incubating the aqueous reaction mixture to obtain nanozeolite Y crystals;   e) washing the obtained nanozeolite Y crystals with an aqueous washing buffer;   f) drying the washed nanozeolite Y crystals to remove residual crystalline water; and   g) calcining the washed nanozeolite Y crystals.   
     
     
         19 . The nanozeolite Y crystals according to  claim 18 , wherein
 a) 90% of the synthesized nanozeolite Y crystals have a diameter of
 i) between 100 and 700 nm, 
 ii) between 50 and 800 nm, or 
 iii) between 200 and 400 nm, 
   b) and/or 90% of the synthesized nanozeolite Y crystals have a specific surface area of
 i) between 500 and 840 m 2 /g, 
 ii) between 450 and 680 m 2 /g, or 
 iii) between 650 and 720 m 2 /g, 
   c) and/or 90% of the synthesized nanozeolite Y crystals have a pore diameter of
 i) between 10 and 14 Å, 
 ii) between 15 and 22 Å, or 
 iii) between 14 and 35 Å, 
   d) and/or 90% of the synthesized nanozeolite Y crystals have a silicon to aluminum ratio of
 i) at least 3.8, 
 ii) at least 7.0, or 
 iii) at least 8.9, 
   e) and/or the synthesized nanozeolite Y crystals do not contain fluoride ions.   
     
     
         20 . Use of the nanozeolite Y crystals according to  claim 18  as catalysts in the catalytic cracking of hydrocarbons, and/or as molecular sieves and/or as ion-exchangers. 
     
     
         21 . Hydrocarbons cracked by using the nanozeolite Y crystals according to  claim 18 .