Paraffin ammoxidation using vanadium antimony oxide based catalysts with halide prometers

The process for the ammoxidation of a C3 to C5 paraffinic hydrocarbon to its corresponding alpha , beta -unsaturated hydrocarbon comprising reacting the C3 to C5 paraffinic hydrocarbon with ammonia and oxygen in a fluid bed reactor at a temperature of between 250 DEG C to 600 DEG C in the presence of a catalyst having the empirical formula as follows: VvSbmAaDdOx wherein A when present is Sn and/or Ti D when present is one or more of Li, Mg, Na, Ca, Sr, Ba, Co, Fe, Cr, Ga, Ni, Zn, Ge, Nb, Zr, Mo, W, Cu, Te, Ta, Se, Bi, Ce, In, As, B, Al, P and Mn; and wherein v is 1, m is 0.5-75, a is 0 to 25, d is 0 to 25, and x is determined by the oxidation state of the cations present, and a minor quantity of an halogen-containing component, preferably characterized by the following formula: R-X or X2 where R=Hydrogen, C1-C20 alkyl and X=F, Cl, Br, I or mixtures thereof.arbo