METHOD FOR MAKING A CATALYST COMPRISING A PHOSPHORUS MODIFIED ZEOLITE TO BE USED IN A MTO PROCESS

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The present invention is the use of a catalyst in a MTO process to convert an alcohol or an ether into light olefins wherein said catalyst comprises a phosphorus modified zeolite and is made by a method comprising the following steps in this order, a)the essential portion of the phosphorus is introduced into a zeolite comprising at least one ten members ring in the structure, b)the phosphorus modified zeolite of step a) is mixed with at least a component selected among one or more binders, salts of alkali-earth metals, salts of rare-earth metals, clays and shaping additives, b)* making a catalyst body from mixture b), c)an optional drying step or an optional drying step followed by a washing step, d) a calcination step, d*) an optional washing step followed by drying, e) optionally a small portion of phosphorus is introduced in the course of step b)or b)*or at end of step b)or b)*.