Preparation of small pore molecular sieves

Details Preparation of small pore molecular sieves Preparation of small pore molecular sieves

C - Chemistry, Metallurgy

01

B

C01B 39/02 (2006.01) B01J 29/70 (2006.01) B01J 37/03 (2006.01) C01B 39/00 (2006.01)

Patent

CA 2670387

Disclosed is a method for preparing crystalline small pore molecular sieves, said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements, (3) at least one active source of an alkali metal, (4) seed crystals capable of forming the small pore molecular sieve, (5) a structure directing agent capable of forming the small pore molecular sieve, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore molecular sieve; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of the small pore molecular sieve.

L'invention concerne un procédé de préparation de tamis moléculaires cristallins à petits pores. Le procédé consiste en ce qui suit : (a) préparer un mélange de réaction comprenant (1) au moins une source active d'un oxyde d'un élément tétravalent ou d'un mélange d'éléments tétravalents, (2) éventuellement au moins une source active d'un oxyde d'un élément trivalent ou d'un mélange d'éléments trivalents, (3) au moins une source active d'un métal alcalin, (4) des cristaux germes capables de former des tamis moléculaires à petits pores, (5) un agent structurant capable de former le tamis moléculaire à petits pores et (6) une quantité d'eau qui n'excède sensiblement pas la quantité nécessaire pour provoquer et maintenir la cristallisation du tamis moléculaire cristallin à petits pores; et (b) réchauffer ce mélange de réaction dans des conditions de cristallisation pendant un temps suffisant pour former un matériau cristallin du tamis moléculaire cristallin à petits pores.

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