Abstract: A hydrocarbon conversion catalyst composition, useful for paraffin-olefin alkylation, can comprise a three dimensional crystalline zeolite molecular sieve having a pore size large enough to adsorb 2,2,3-trimethylpentane and having a composition expressed in terms of mole ratios of oxides asa(I.sub.2 O):b(IIO):c(III.sub.2/3 O):d(IV.sub.1/2 O)Al.sub.2 O.sub.3 :eSiO.sub.2wherein I represents a monovalent metal cation; II represents a divalent metal cation; III represents a trivalent metal cation; IV represents a tetravalent cation; a has a value of from zero to 0.15; b has a value of from zero to 0.75; c and d each have values of from zero to 1; e has a value of from 2 to 20; with the proviso that when e has a value of from 2 to 3, the value of ((b+c)=0.75 to 1 and d=0; and with the proviso that when e has a value of > 3 to 4, the value of (b+c+d)=0.6 to 1.0; and with the further proviso that when e has a value of > 4 to 20, the value of (b+c+d)=0.25 to 1.0.

Abstract: A process for preparing a supported .alpha.-prime phase vanadium bronze ammoxidation catalyst by forming the .alpha.-prime phase in the absence of the support, physically mixing the dry, solid support with the dry, solid catalyst, and calcining the mixture at a temperature of about 400.degree. C. to about 600.degree. C.