Synthetic layered MCM-56, its synthesis and use

A synthetic layered material having a composition comprising the molar relationship

• X.sub.2 O.sub.3 :(n)YO.sub.2,
• wherein n is less than about 35, X is a trivalent element selected from the group consisting of aluminum, boron., iron, gallium, and combination thereof, and Y is a tetravalent element selected from the group consisting of silicon, germanium, and combination thereof, said material further characterized by a sorption capacity for 1,3,5-trimethylbenzene of at least about 35 .mu.l/gram of calcined synthetic material, an initial uptake of 15 mg 2,2-dimethylbutane/gram of calcined synthetic material of less than about 20 seconds, and an X-ray diffraction pattern for the calcined synthetic material having d-spacing maxima at 12.4.+-.0.2, 9.9.+-.0.3, 6.9.+-.0.1, 6.2.+-.0.1, 3.55.+-.0.07, and 3.42.+-.0.07 Angstroms.