Stabilization of acid catalysts
AssigneeExxonMobil Chemical Patents Inc.
InventorsFilip Mees, Etienne Vansant, Marcel Johannes Janssen, Luc R.M. Martens
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Abstract
The invention is directed to a method of stabilizing metalloaluminophosphate molecular sieves and catalysts derived therefrom. In particular, the invention is directed to a method of treating such molecular sieves with chemisorbed ammonia, which may be easily desorbed before or during use and after storage. The invention is also directed to formulating the molecular sieve into a catalyst useful in a process for producing olefin(s), preferably ethylene and/or propylene, from a feedstock, preferably an oxygenate containing feedstock.
Claims75
A method of providing a stabilized metalloaluminophosphate molecular sieve, which method comprises the steps of
- a. providing a metalloaluminophosphate molecular sieve having a framework structure,
- b. treating the metalloaluminophosphate molecular sieve with a source of ammonia under conditions to chemisorb ammonia with the metalloaluminophosphate molecular sieve, and
- c. maintaining the ammonia chemisorbed with the metalloaluminophosphate molecular sieve for a period of at least 24 hours.
A method of providing an active metalloaluminophosphate molecular sieve, which method comprises the steps of
- a. providing a metalloaluminophosphate molecular sieve having a framework structure,
- b. treating the metalloaluminophosphate molecular sieve with a source of ammonia under conditions to chemisorb ammonia with the metalloaluminophosphate molecular sieve,
- c. maintaining the ammonia chemisorbed with the metalloaluminophosphate molecular sieve for a period of at least 24 hours, and
- d. desorbing the chemisorbed ammonia.
A method for the manufacture of a catalyst composition, which method comprises the steps of
- a. forming a mixture comprising at least one metalloaluminophosphate molecular sieve having a framework structure with at least one binder material and/or at least another catalytically active material, and
- b. treating the mixture with a source of ammonia under conditions to chemisorb ammonia with the metalloaluminophosphate molecular sieve.
A method for the manufacture of a catalyst composition, which method comprises the steps of
- a. forming a mixture comprising at least one metalloaluminophosphate molecular sieve having ammonia chemisorbed thereon with at least one binder material and/or at least another catalytically active material, to form a catalyst composition.
A stabilized metalloaluminophosphate molecular sieve, which comprises at least one, aged metalloaluminophosphate molecular sieve and chemisorbed ammonia.
A method for storing metalloaluminophosphate molecular sieves which method comprises maintaining the metalloaluminophosphate molecular sieve in contact with ammonia in a chemisorbed state during storage.
A method for protecting a metalloaluminophosphate molecular sieve from exposure to steam, which method comprises maintaining the metalloaluminophosphate molecular sieve in contact with ammonia in a chemisorbed state while the metalloaluminophosphate molecular sieve is exposed to steam.
A molecular sieve composition comprising at least one metalloaluminophosphate molecular sieve in admixture with at least one binder and/or at least one other catalytically active material and chemisorbed ammonia.
A molecular sieve composition comprising at least one metalloaluminophosphate molecular sieve having ammonia chemisorbed thereon and in admixture with at least one binder and/or at least one other catalytically active material.
A hydrocarbon conversion process comprising the steps of:
- (a) introducing a feedstock to a reactor system in the presence of a metalloaluminophosphate molecular sieve having ammonia chemisorbed thereon;
- (b) withdrawing from the reactor system an effluent stream;
- and
- (c) passing the effluent gas through a recovery system recovering at least the one or more conversion products.
Dependencies are inferred from the claim text.