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.

Esta invenção é dirigida a um método de fazer um produto do olefin de um feedstock do oxygenate e a um método de proteger a atividade catalytic de um sieve molecular do silicoaluminophosphate. Os métodos compreendem fornecer um sieve molecular do silicoaluminophosphate que tem locais catalytic dentro do sieve molecular; protegendo os locais catalytic para proteger da perda da atividade catalytic; e contatando o sieve protegido em seu estado ativado com um feedstock do oxygenate sob as circunstâncias eficazes produzir um produto do olefin antes da perda indesejável da atividade catalytic. A perda indesejável na atividade catalytic ocorre quando o sieve molecular ativado que contata o feedstock do oxygenate tem um índice do uptake do metanol ao menos de 0.15.

 
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