Patent ID: 7087551

Claim:
An oxide catalyst for use in catalytic oxidation or ammoxidation of propane or isobutane in the gaseous phase, which comprises an oxide represented by the following formula (I): Mo 1 V a Nb b X c Y d Z e Q f O n (I) wherein: X is at least one element selected from the group consisting of tellurium and antimony; Y is at least one element selected from the group consisting of aluminum and tungsten; Z is at least one element selected from the group consisting of elements which individually form an oxide having a rutile structure and which are titanium, tin, germanium, lead, tantalum, ruthenium, rhenium, rhodium, iridium, platinum, molybdenum, vanadium, niobium, tellurium, antimony, aluminums and tungsten; Q is at least one element selected from the group consisting of titanium, tin, germanium, lead, tantalum, ruthenium, rhenium, rhodium, iridium, platinum, chromium, manganese, technetium, osmium, iron, arsenic, cerium, cobalt, magnesium, nickel and zinc; and a, b, c, d, e, f and n are, respectively, the atomic ratios of vanadium (V), niobium (Nb), X, Y, Z, Q and oxygen (O), relative to molybdenum (Mo), wherein: 0.1≦a≦1.0, 0.01≦b≦1.0, 0.01≦c≦1.0, 0≦d≦5, 0≦e≦3, 0≦f≦9, with the proviso that 0<d+e≦3.5, and n is a number determined by and consistent with the valence requirements of the other elements present in the oxide of formula (I); said oxide catalyst being produced by calcining a dried catalyst precursor, said precursor comprising: (i) a molybdenum (Mo) compound which does not have a rutile structure; (ii) a vanadium (V) compound which does not have a rutile structure; (iii) a niobium (Nb) compound which does not have a rutile structure; (iv) at least one X compound selected from the group consisting of compounds of elements defined as X in formula (I), wherein said X compound does not have a rutile structure; (v) at least one compound selected from the group consisting of the following compounds (v-1) and (v-2): (v-1) at least one Y compound selected from the group consisting of compounds of elements defined as Y in formula (I), wherein said Y compound does not have a rutile structure, and (v-2) at least one Z oxide selected from the group consisting of oxides of elements defined as Z in formula (I), wherein said Z oxide has a rutile structure; and optionally (vi) at least one Q compound selected from the group consisting of compounds of elements defined as Q in formula (I), wherein said Q compound does not have a rutile structure, wherein said Mo compound, said V compound, said Nb compound, said X compound, said Y compound, said Z oxide and said Q compound are, respectively, used in amounts such that the atomic ratios of the Mo, V, Nb, X, Y, Z and Q in the catalyst obtained satisfy the atomic ratio requirements defined for formula (I).