Co-promoted vanadyl pyrophosphate catalyst (Co/V = 2.23 %) was prepared by classical organic method via VOHPO(4)(.)0.5H(2)O precursor and calcined for 100 It in a mixture of n-butane in air. The synthesized catalyst was characterized by N-2 physisorption, ICP, X-ray diffraction, scanning electron microscopy, and temperature-programmed desorption of oxygen.