Method of removing structure directing agents from molecular sieves
AssigneesCalifornia Institute of Technology, Chevron U.S.A. Inc.
InventorsMark E. Davis, Hyunjoo Lee, Stacey I. Zones
Life of this patent
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Abstract
A structure directing agent is removed from a microporous solid at a temperature below the temperature that would cause the structure directing agent to decompose by cleaving the structure directing agent within the pores of the microporous solid, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the pores of the microporous solid at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
Claims100
A method of removing a structure directing agent from a microporous solid at a temperature below the temperature that would cause the structure directing agent to decompose comprising cleaving the structure directing agent within the pores of the microporous solid, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the pores of the microporous solid at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
A method of removing a structure directing agent from a porous molecular sieve at a temperature below the temperature that would cause the structure directing agent to decompose comprising cleaving the structure directing agent within the pores of the molecular sieve, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the pores of the molecular sieve at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
A method of making a porous, crystalline molecular sieve comprising:
- (a) preparing an aqueous solution from (1) sources of an alkali metal oxide, alkaline earth metal oxide or mixtures thereof;
- (2) sources of an oxide selected from the oxides of aluminum, iron, gallium, indium, titanium, or mixtures thereof;
- (3) sources of an oxide selected from oxides of silicon, germanium or mixtures thereof;
- and (4) a structure directing agent capable of forming the molecular sieve;
- (b) maintaining the aqueous solution under conditions sufficient to form porous crystals of the molecular sieve which contain the structure directing agent in the pores;
- and
- (c) cleaving the structure directing agent, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the molecular sieve at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
A method of making a porous, crystalline molecular sieve comprising:
- (a) preparing an aqueous solution from (1) sources of an alkali metal oxide, alkaline earth metal oxide or mixtures thereof;
- (2) sources of an oxide selected from the oxides of aluminum, iron, gallium, indium, titanium, or mixtures thereof;
- (3) sources of an oxide selected from oxides of silicon, germanium or mixtures thereof;
- and (4) a structure directing agent capable of forming the molecular sieve;
- and (5) an amine component comprising at least one amine containing one to eight carbon atoms, ammonium hydroxide and mixtures thereof;
- (b) maintaining the aqueous solution under conditions sufficient to form porous crystals of the molecular sieve which contain the structure directing agent and the amine component in the pores;
- (c) removing the amine component from the pores of the molecular sieve at a temperature below the temperature that would cause the structure directing agent or the amine component to decompose;
- and
- (d) cleaving the structure directing agent, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the molecular sieve at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
A method of making a microporous solid comprising:
- (a) preparing a reaction mixture comprising at least one active source of reactants required to produce the microporous solid, a structure directing agent capable of forming said microporous solid, and sufficient water to shape said mixture into a self-supporting shape;
- (b) heating said reaction mixture at crystallization conditions and in the absence of an external liquid phase for sufficient time to form the microporous solid containing the structure directing agent;
- and
- (c) cleaving the structure directing agent, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the molecular sieve at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
A method of making a microporous solid comprising:
- (a) preparing a reaction mixture comprising at least one active source of reactants required to produce the microporous solid, a structure directing agent capable of forming said microporous solid, an amine component comprising at least one amine containing one to eight carbon atoms, ammonium hydroxide and mixtures thereof, and sufficient water to shape said mixture into a self-supporting shape;
- (b) heating said reaction mixture at crystallization conditions and in the absence of an external liquid phase for sufficient time to form the microporous solid containing the structure directing agent and the amine component;
- and
- (c) removing the amine component from the pores of the molecular sieve at a temperature below the temperature that would cause the structure directing agent or the amine component to decompose;
- and
- (d) cleaving the structure directing agent, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the molecular sieve at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
Dependencies are inferred from the claim text.