Catalysis over activated zeolites

A process for converting a feedstock comprising an alcohol, ether or mixture thereof to conversion products comprising hydrocarbons which comrpises contacting said feedstock at conversion conditions with a catalyst comprising a zeolite composition prepared by a method which comprises impregnating a zeolite having an initial silica-to-alumina mole ratio of 70 or more and the structure of ZSM-5 with an ammoniacal aluminum fluoride solution at a temperature of from about 0.degree. C. to about 100.degree. C., said solution comprising from about 0.1 to about 5 weight percent of an aluminum fluoride in solution with at least one member selected from the group consisting of ammonium hydroxide and ammonia, contacting the impregnated zeolite with a warm aqueous 0.1 to 2 Normal solution of an ammonium salt, and calcining the ammonium salt solution contacted material at a temperature of from about 200.degree. C. to about 600.degree. C.