Modified crystalline aluminosilicate for dehydration of alcohols

A catalyst composition, for the dehydration of alcohols to olefins having the same number of carbons, comprising a modified crystalline aluminosilicate wherein

• said modified crystalline aluminosilicate is of the Framework Type FER having Si/Al framework molar ratio greater than 20;
• wherein said modified crystalline aluminosilicate comprises an extra framework aluminum, (EFAL) content lower than 15 wt % as measured by 27Al MAS NMR;
• wherein said modified crystalline aluminosilicate comprises a ratio between the strong acid sites and the weak acid sites, S/W which is lower than 1.0;
• the ratio S/W being measured by temperature-programmed desorption of ammonia and being determined by the ratio of the peak area of ammonia desorbed above 340° C. to that desorbed below 340° C.;
• and
• said modified crystalline aluminosilicate is prepared from a crystalline aluminosilicate which is not steamed and is prepared with either one or both of the following treatments:
• said crystalline aluminosilicate is treated with an organic acidic medium, an organic medium, or combinations thereof;
• strong acid sites of said crystalline aluminosilicate are selectively poisoned with alkali salts or alkaline earth salts or silver so that the weight percent of alkali or alkaline earth or silver on the catalyst composition is of at least 0.5% weight, as measured by chemical analysis with the method ASTM UOP961-12.