The Chemistry of Preparation of V—P Mixed Oxides: Effect of the Preparation Parameters on the Catalytic Performance in n-Butane and n-Pentane Selective Oxidation

Publisher Summary This chapter illustrates that the catalytic behavior of a fresh catalyst can be remarkably affected by the conditions employed for the precursor dehydration. The behavior of the flesh catalyst is important only in the first 200-300 h of time-on-stream, as nonequilibrated catalysts are slowly converted to the equilibrated form. Nevertheless, it is very important to perform activation procedures that can guarantee the obtainment of a structural composition as close as possible to the equilibrated form, in terms of vanadium valence state and degree of crystallinity, in order to shorten the unstable catalytic performance at the beginning of lifetime. The most important aspect is to avoid vanadium overoxidation, performing the dehydration in either nonoxidizing atmosphere or in air but with a careful control of the calcination conditions.