Patent ID: 6177374
Filing Date: 2001-01-23
Classification: B01J,Y10S

Abstract:
A process for the preparation of a porous crystalline synthetic material comprising silicon, zinc and aluminum oxides designated as Zn--ZSM-5 in which Zn forms part of a crystalline framework of the material, the material being useful as a catalyst for the preparation of high octane gasoline blending feed stock, BTX aromatics and LPG from a feed stock that is non-reformable by conventional means, the feed stock being selected from the group of: natural gas condensate, aromatic extraction raffinate and light naphtha, the process comprising:(a) forming a reaction medium comprising water, a silicon source, an aluminum source, a water-soluble zinc source and a source of structure directing agent capable of providing organic cations,wherein the source of zinc used is selected from zinc salts which are capable of being converted into zinc oxide upon calcination, and wherein the zinc salt is Zn(NO.sub.3).sub.2 ;(b) heating the reaction mixture to a temperature ranging from 80.degree. C. to 230.degree. C. at autogeneous phase; and(c) heating solid content obtained at the end of step (b) to a temperature greater than 400.degree. C., so as to eliminate the organic species present due to the use of the structuring agent.