Crystalline composition

A process for converting feedstock comprising hydrocarbon compounds to product comprising hydrocarbon compounds of lower molecular weight than said feedstock hydrocarbon compounds which comprises contacting said feedstock at conditions for said conversion with catalyst comprising crystals having a composition, on an anhydrous basis, as follows:

• M.sub.x/m.sup.m+ :(XO.sub.2).sub.1-y.sup.- :YO.sub.2).sub.1-x.sup.+ :(ZO.sub.2).sub.x+y :N.sub.y/n.sup.n-
• wherein X is a +3 valence element, Y is a +5 valence element, Z is a +4 valence element, M is a cation of valence m, N is an anion of valence n, and x and y are numbers of from greater than -1 to less than +1 which satisfy the relationships:
• (1) if x is 0, then y is not 0,
• (2) if y is 0, then x is not 0, and
• (3) x+y is greater than 0.001 and less than 1,
• said crystals having pore windows formed by 18 tetrahedral members.

A process for converting feedstock comprising hydrocarbon compounds to product comprising hydrocarbon compounds of lower molecular weight than said feedstock hydrocarbon compounds which comprises contacting said feedstock at conditions for said conversion with catalyst comprising crystals having a framework topology after heating at 110.degree. C. or higher giving an X-ray diffraction pattern with interplanar d-spacings at 16.4.+-.0.2 Angstroms, 8.2.+-.0.1 Angstroms and 4.74.+-.0.05 Angstroms, and without a significant interplanar d-spacing at 13.6-13.3 Angstroms, said crystals having been synthesized by the method comprising:

• (1) providing a reaction mixture comprising sources of X oxide, Y oxide and Z oxide, wherein X represents one or more elements of +3 valence selected from the group consisting of aluminum, iron, chromium, vanadium, molybdenum, arsenic, antimony, manganese, gallium and boron;
• Y represents one or more elements of +5 valence selected from the group consisting of phosphorus, arsenic, antimony and vanadium;
• and Z represents one or more elements of +4 valence selected from the group consisting of silicon, germanium and titanium, one of said oxide sources being unstable in water, an organic directing agent D, inorganic cations M and anions N, and a substantially water-immiscible organic solvent for said oxide source unstable in the water, the components of said reaction mixture having the following relationship:
• (D).sub.a :(M.sub.2 O).sub.b :(X.sub.2 O.sub.3).sub.c :(ZO.sub.2).sub.d :(Y.sub.2 O.sub.5).sub.e :(Solvent).sub.f :(N).sub.g :(H.sub.2 O).sub.h
• where a, b, c, d, e, f, g, and h are numbers satisfying the following relationships:
• a/(c+d+e) is less than 4,
• b/(c+d+e) is less than 2,
• d/(c+e) is less than 2,
• f/(c+d+e) is from 0.1 to 15,
• g/(c+d+e) is less than 2, and
• h/(c+d+e) is from 3 to 150,
• wherein upon initial provision of said reaction mixture said oxide source unstable in the water is dispersed or dissolved in the water-immiscible organic solvent;
• (2) heating said reaction mixture at a rate of from 5.degree. C. to 200.degree. C. per hour to a temperature of from 80.degree. C. to 300.degree.;
• (3) agitating said reaction mixture in a manner sufficient to intimately admix the water-immiscible organic solvent and the water with each other, thereby progressively hydrolyzing the oxide source unstable in water;
• (4) maintaining said agitated reaction mixture at a temperature of from 80.degree. C. to 300.degree. C. and a pH of from 2 to 9 until said crystals are formed;
• and
• (5) recovering from said reaction mixture said crystals.