Crystalline zeolite, method of preparing same and process for the production of olefins using same as catalyst

Abstract

A crystalline aluminosilicate having the following empirical formula: xM.sub.2 O.yM'O.Al.sub.2 O.sub.3.zSiO.sub.2.nH.sub.2 O wherein M is an exchangeable cation selected from the group consisting of alkali metals, hydrogen and mixtures thereof, M' is an alkaline earth metal, x is between 0 and 1.5, y is between 0.2 and 40, z is between 12 and 3000 and n is between 0 and 40 and wherein x+y is 1.2 or more, said aluminosilicate having the X-ray diffraction lines of Table 1 of the specification. The crystalline aluminosilicate material is obtained by providing a reaction mixture containing water, a tetrapropylammonium compound and a source of an alkali metal oxide, an oxide of silicon, an oxide of aluminum and an oxide of an alkaline earth metal and having a composition falling within the following ranges: SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio: 12-3000 OH.sup.- /SiO.sub.2 molar ratio: 0.02-10 H.sub.2 O/SiO.sub.2 molar ratio: 1-1000 tetrapropylammonium ion/SiO.sub.2 molar ratio: 0.02-2 alkaline earth metal/Al atomic ratio: 0.03-300, and maintaining the mixture at a temperature and for a period of time sufficient to form crystals of the aluminosilicate. The aluminosilicate is useful as catalyst for converting methanol and/or dimethyl ether into lower olefins.

Dependencies are inferred from the claim text.