Catalytic process for modifying organic compounds

Claim 1

A process for cracking hydrocarbons, said process comprising contacting said hydrocarbons with a catalyst under hydrocarbon cracking conditions at a temperature of from about 300° C. to about 700° C., a pressure of from about 0.1 atmosphere to about 30 atmospheres and a weight hourly space velocity of from 0.1 hr. -1 to about 20 hr. -1 , said catalyst comprising a synthetic crystalline material comprising silicon, phosphorus and aluminum which, as synthesized, exhibits a characteristic X-ray diffraction pattern as shown in Table 1-A of the specification, and which in the anhydrous crystalline form has the formula: (AlO.sub.2).sub.1-y.sup.- :(PO.sub.2).sub.1-x.sup.+ :(SiO.sub.2).sub.x+y wherein 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, (3) if the atomic ratio of Al/P is greater than 1, then (x+y) is greater than 0.001 and y+0.6x is less than 0.4, and (4) if the atomic ratio of Al/P is less than 1, then (x+y) is greater than 0.001 and X+0.5 y is less than 0.5.