Molecular sieve compositions with aluminum, phosphorus and at least two other elements

Crystalline molecular sieves having three-dimensional microporous framework structures of MO.sub.2, AlO.sub.2 and PO.sub.2 tetrahedral units having an empirical chemical composition on an anhydrous basis expressed by the formula:

• mR:(M.sub.x Al.sub.y P.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 (M.sub.x Al.sub.y P.sub.z)O.sub.2 and has a value of zero to about 0.3;
• "M" represents at least two elements, M.sub.1 and M.sub.2, selected from the group consisting of arsenic, beryllium, boron, chromium, gallium, germanium, lithium and vanadium;
• and "x", "y" and "z" represent the mole fractions of M (=M.sub.1 +M.sub.2 etc.), aluminum and phosphorus, respectively, present as tetrahedral oxides, said mole fractions being such that they are within the pentagonal compositional area defined by points A, B, C, D and E of FIG. 1 and each mole fraction for M.sub.1, M.sub.2, aluminum and phosphorus has a value of at least 0.01.

Process for preparing crystalline molecular sieves of claim 42 having three-dimensional framework structures wherein the process comprises providing at an effective temperature and for an effective time a reaction mixture composition expressed in terms of molar oxide ratios as follows:

• aR:(M.sub.x Al.sub.y P.sub.z)O.sub.2 :bH.sub.2 O
• wherein "R" is an organic templating agent;
• "a" is an effective amount of "R" greater than zero;
• "b" has a value of from zero to about 500;
• "M" represents at least two elements capable of forming tetrahedral oxides and selected from the group consisting of arsenic, beryllium, boron, chromium, gallium, germanium, lithium and vanadium;
• "x", "y" and "z" represent the mole fractions, respectively, of "M", aluminum and phosphorus in the (M.sub.x Al.sub.y P.sub.z)O.sub.2 constituent, and each has a value of at least 0.01, whereby molecular sieves according to claim 64 are prepared.