Preparation of non-zeolitic molecular sieves
AssigneeChevron U.S.A. Inc.
InventorStephen J. Miller
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Abstract
A process is disclosed for preparing a non-zeolitic molecular sieve from a dense gel containing sufficient liquid that the dense gel may be formed into self-supporting particles if desired prior to crystallization. In the process, the dense gel, which is optionally in the form of particles, is heated at crystallization conditions and in the absence of an external liquid phase, so that excess liquid need not be removed at the conclusion of the crystallization step.
Claims32
A process for preparing a non-zeolitic molecular sieve comprising:
- a. producing particles comprising:
- i. at least one active source of phosphorous,
- ii. at least one active source of alumina,
- iii. an organic templating agent capable of forming the molecular sieve, and
- iv. sufficient water to make the particles;
- and
- b. maintaining the particles at crystallization conditions for sufficient time to form a crystallized product comprising crystals of the molecular sieve.
A process for preparing a non-zeolitic molecular sieve comprising:
- a. producing a self-supporting gel comprising:
- i. at least one active source of phosphorous,
- ii. at least one active source of alumina,
- iii. an organic templating agent capable of forming the molecular sieve,
- iv. sufficient water to form the self-supporting gel into particles;
- b. forming the self-supporting gel into particles;
- c. maintaining the self-supporting gel particles at crystallization conditions for sufficient time to form a crystallized product comprising crystals of the molecular sieve.
A process for producing a non-zeolitic molecular sieve comprising:
- a. producing a self-supporting gel comprising:
- i. at least one active source of phosphorous,
- ii. at least one active source of alumina,
- iii. an organic templating agent capable of forming the molecular sieve, and
- iv. water;
- b. forming the self-supporting gel into a shape;
- and
- c. maintaining the self-supporting gel at crystallization conditions for sufficient time to form a crystallized product comprising crystals of the molecular sieve,
- wherein the ratio of components of the self-supporting gel prior to crystallization is such that the self-supporting gel is capable of being formed into a shape, and capable of maintaining that shape.
Dependencies are inferred from the claim text.