Molecular sieve compositions

Process for converting a hydrocarbon which comprises contacting said hydrocarbon under hydrocarbon converting conditions with a molecular sieve, said molecular sieve being a crystalline molecular sieve having three-dimensional microporous framework structures of ELO.sub.2, AlO.sub.2, PO.sub.2, SiO.sub.2 oxide units and having an empirical chemical composition on an anhydrous basis expressed by the formula:

• mR:(EL.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2
• wherein "R" represents at least one organic templating agent present in the intracrystalline pore system;
• "m" represents the molar amount of "R" present per mole of (EL.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2 and has a value of zero to about 0.3;
• "EL" represents at least one element capable of forming a three dimensional oxide framework, "EL" is characterized as an element having a mean "T--O" distance in tetrahedral oxide structures between about 1.51 Angstroms and about 2.06 Angstroms, "EL" has a cation electronegativity between about 125 kcal/g-atom to about 310 kcal/g-atom and "EL" is capable of forming stable M--O--P, M--O--Al or M--O--M bonds in crystalline three dimensional oxide structures having an "M--O" bond dissociation energy greater than about 59 kcal/mole at 289.degree. C.;
• and "w", "x", "y" and "z" represent the mole fractions of "EL", aluminum, phosphorus, and silicon, respectively, present as framework oxides, said mole fractions being within the pentagonal compositional area defined by points A, B, C, D and E of FIG. 1, wherein element "EL" and each of aluminum, phosphorus and silicon are present such that "w", "x", "y" and "z" are at least 0.01 and each element "EL" is present as a tetrahedral oxide unit ELO.sub.2 in an amount of at least 0.01.