초록 ▼

Disclosed is an oxide catalyst for use in catalytic oxidation or ammoxidation of propane or isobutane in the gaseous phase, which comprises a composition represented by the Mo1Va SbbNbcZdOn (wherein: Z is at least one element selected from the group consisting of tungsten, chromium, titanium, alumin

Disclosed is an oxide catalyst for use in catalytic oxidation or ammoxidation of propane or isobutane in the gaseous phase, which comprises a composition represented by the Mo1Va SbbNbcZdOn (wherein: Z is at least one element selected from the group consisting of tungsten, chromium, titanium, aluminum, tantalum, zirconium, hafnium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, zinc, boron, indium, germanium, tin, lead, bismuth, yttrium, gallium, rare earth elements and alkaline earth metals: and a, b, c, d, and n are, respectively, the atomic ratios of V, Sb, Nb, Z and O, relative to Mo), wherein 0.1≦a<0.4, 0.1<b≦0.4, 0. 01≦c≦0.3, 0≦d≦1, with the proviso that a<b, and n is a number determined by and consistent with the valence requirements of the other elements present. Also disclosed is a process for producing an unsaturated carboxylic acid or an unsaturated nitrile by using the above-mentioned oxide catalyst.

대표청구항 ▼

What is claimed is: 1. An oxide catalyst for use in catalytic oxidation or ammoxidation of propane or isobutane in the gaseous phase, which comprises a composition represented by the following formula (I): description="In-line Formulae" end="lead"Mo1 VaSbbNbcZdOn (I)description="In-line Formulae"

What is claimed is: 1. An oxide catalyst for use in catalytic oxidation or ammoxidation of propane or isobutane in the gaseous phase, which comprises a composition represented by the following formula (I): description="In-line Formulae" end="lead"Mo1 VaSbbNbcZdOn (I)description="In-line Formulae" end="tail" wherein: Z is at least one element selected from the group consisting of tungsten, chromium, titanium, aluminum, tantalum, zirconium, hafnium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, zinc, boron, indium, germanium, tin, lead, bismuth, yttrium, gallium, rare earth elements and alkaline earth metals; and a, b, c, d, and n are, respectively, the atomic ratios of vanadium (V), antimony (Sb), niobium (Nb), Z and oxygen (O), relative to molybdenum (Mo), wherein: 0.1≦a<0.4, 0.1<b≦0.4, 0.01≦c≦0.3, 0≦d≦1, with the proviso that a<b, and n is a number determined by and consistent with the valence requirements of the other elements present. 2. The oxide catalyst according to claim 1, wherein a in formula (I) satisfies the following relationship: 0.1≦ a≦0.3. 3. The oxide catalyst according to claim 1, wherein b in formula (I) satisfies the following relationship: 0.1<b≦ 0.35. 4. The oxide catalyst according to claim 1, wherein c in formula (I) satisfies the following relationship: 0.05≦ c≦0.2. 5. The oxide catalyst according to claim 1, wherein a in formula (I) satisfies the following relationship: 0.15≦ a≦0.28. 6. The oxide catalyst according to claim 1, wherein b in formula (I) satisfies the following relationship: 0.2≦ b≦0.33. 7. The oxide catalyst according to claim 1, wherein c in formula (I) satisfies the following relationship: 0.05≦ c≦0.15. 8. The oxide catalyst according to claim 1, wherein a, b and c in formula (I) satisfy the following relationships: 0.15≦a≦0.28; 0.2≦b≦0.33; 0.05≦c≦0.15; 0.5≦a+b+c≦0.69; 9. The oxide catalyst according to claim 1, wherein a, b and c in formula (I) satisfy the following relationships: 0.16≦a≦0.28; 0.24≦b≦0.33; 0.07≦c≦0.15; 0.53≦a+b+c≦0.67; 10. The oxide catalyst according to claim 1, wherein a, b and c in formula (I) satisfy the following relationships: 0.16≦a≦0.26; 0.24≦b≦0.30; 0.08≦c≦0.12; 0.57≦a+b+c≦0.60; 11. The oxide catalyst according to claim 1, which exhibits, in an X-ray diffraction pattern thereof obtained using CuKα as a source of X-ray, peaks at diffraction angles (2θ) of: 22.1짹0.3째, 28.1짹0.3째, 36.1짹0.3째 and 45.2짹0.3째; 7.8짹0.3째, 8.9짹0.3째, 22.1짹0.3째, 27.1짹0.3째, 35.2짹0.3째 and 45. 2짹0.3째; or 7.8짹0.3째, 8.9짹0.3째, 22.1짹0.3째, 27.1짹0.3째, 28.1짹0.3째, 35.2짹0. 3째, 36.1짹0.3째 and 45.2짹0.3째. 12. The oxide catalyst according to claim 1, which further comprises a silica carrier having supported thereon said oxide catalyst, wherein said silica carrier is present in an amount of from 20 to 60% by weight in terms of SiO2, based on the total weight of said oxide catalyst and said silica carrier in terms of SiO2. 13. The oxide catalyst according to claim 1, wherein Z in formula (I) is at least one element selected from the group consisting of tungsten, chromium, titanium, aluminum, tantalum, zirconium, iron, boron, indium, germanium and tin. 14. The oxide catalyst according to claim 1, which is produced by a method comprising providing an aqueous raw material mixture containing compounds of molybdenum, vanadium, antimony, niobium and optionally Z, and drying said aqueous raw material mixture, followed by calcination. 15. The oxide catalyst according to claim 14, wherein the calcination is performed at 500 to 700째 C. in an atmosphere of inert gas which is substantially free of molecular oxygen. 16. The oxide catalyst according to claim 14, wherein said aqueous raw material mixture further contains oxalic acid, wherein the molar ratio of said oxalic acid to said niobium compound in terms of niobium is in the range of from 1 to 10. 17. A process for producing the oxide catalyst of claim 1, which comprises: providing an aqueous raw material mixture containing compounds of molybdenum, vanadium, antimony, niobium and optionally Z respectively in amounts which are adapted for producing an oxide catalyst comprising a composition represented by formula (I), and drying said aqueous raw material mixture, followed by calcination, thereby obtaining the oxide catalyst of claim 1. 18. The process according to claim 17, wherein the calcination is performed at 500 to 700째 C. in an atmosphere of inert gas which is substantially free of molecular oxygen. 19. The process according to claim 17, wherein said aqueous raw material mixture further contains oxalic acid, wherein the molar ratio of said oxalic acid to said niobium compound in terms of niobium is in the range of from 1 to 10. 20. The oxide catalyst according to claim 1, wherein d in formula (I) satisfies the following relationship: 0≦ d≦0.4.