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AssigneeExxonMobil Chemical Patents Inc.
InventorsMarcel J. G. Janssen, Cornelius W. M. Van Oorschot, Shun C. Fung, Luc R. M. Martens, Wilfried J. Mortier, Ronald G. Searle, Machteld M. Mertens, Stephen N. Vaughn
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This invention is directed to a method of making an olefin product from an oxygenate feedstock and a method of protecting catalytic activity of a silicoaluminophosphate molecular sieve. The methods comprise providing a silicoaluminophosphate molecular sieve having catalytic sites within the molecular sieve; shielding the catalytic sites to protect from loss of catalytic activity; and contacting the protected sieve in its activated state with an oxygenate feedstock under conditions effective to produce an olefin product before undesirable loss of catalytic activity. Undesirable loss in catalytic activity occurs when activated molecular sieve contacting the oxygenate feedstock has a methanol uptake index of at least 0.15.
A method of protecting catalytic activity of a silicoaluminophosphate molecular sieve, comprising providing a silicoaluminophosphate molecular sieve with a pore size of less than 5 angstroms and at a temperature less than 150° C. having catalytic sites protected against loss of catalytic activity by covering with a shield, and introducing the molecular sieve into an oxygenate reaction system, wherein the molecular sieve has a methanol uptake index of at least 0.15 at time of contact with oxygenate under conditions effective to convert the oxygenate to olefin product.
Dependencies are inferred from the claim text.