Removal of occluded alkali metal cations from MSE-framework type molecular sieves
AssigneeExxonMobil Research and Engineering Company
InventorsAllen W. Burton, Karl G. Strohmaier, Scott J. Weigel
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Abstract
A method for reducing the level of occluded alkali metal cations from an MSE-framework type molecular sieve comprises either (a) contacting the molecular sieve with a solution containing ammonium ions at a temperature of at least about 50° C. to ammonium-exchange at least part of the occluded potassium ions or (b) contacting the molecular sieve with steam at a temperature of at least about 300° C. and then subjecting the steamed molecular sieve to ammonium exchange.
Claims20
A method for reducing a level of occluded alkali metal cations from an MSE-framework type molecular sieve, the method comprising:
- (a1) contacting an MSE framework-type molecular sieve containing a first amount of occluded potassium ions with a solution containing ammonium ions at a temperature of at least about 50° C. to ammonium-exchange at least part of the occluded potassium ions and produce a treated molecular sieve containing a second amount of occluded potassium ions, wherein the second amount is less than the first amount;
- and
- exchanging the treated molecular sieve with cations of a rare earth element.
A method for reducing a level of occluded alkali metal cations from an MSE-framework type molecular sieve, the method comprising:
- (a2) contacting an MSE framework-type molecular sieve containing a first amount of occluded potassium ions with steam at a temperature of at least about 300° C. to produce a steamed molecular sieve;
- and
- (b2) contacting the steamed molecular sieve with a solution containing ammonium ions to ammonium-exchange at least part of the potassium ions in the steamed molecular sieve thereby producing a treated molecular sieve containing a second amount of occluded potassium ions, wherein the second amount is less than the first amount;
- and
- exchanging the treated molecular sieve with cations of a rare earth element.
Dependencies are inferred from the claim text.