A method for maintaining the activity of silicoaluminophosphate (SAPO) molecular sieve catalyst particles during oxygenate to olefin conversion reactions. After regeneration of SAPO catalyst particles, the regenerated particles are mixed with particles having coke on their surface in a manner that maintains their catalytic activity at a predetermined level.

 
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> Apparatus for treating a fluid to increase oxygen concentration and reduce surface tension

> Semiconductor package device that includes an insulative housing with a protruding peripheral portion
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