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 Mo1VaSbbNbcZdOn (wherein: Z is at least one element selected from the group consisting of tungsten, chromium, titanium, aluminu

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 Mo1VaSbbNbcZdOn (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

대표청구항 ▼

What is claimed is: 1. A process for producing acrylic acid or methacrylic acid, which comprises reacting propane or isobutane with molecular oxygen in the gaseous phase in the presence of an oxide catalyst, said oxide catalyst comprising a composition represented by the following formula (I): de

What is claimed is: 1. A process for producing acrylic acid or methacrylic acid, which comprises reacting propane or isobutane with molecular oxygen in the gaseous phase in the presence of an oxide catalyst, said oxide catalyst comprising a composition represented by the following formula (I): description="In-line Formulae" end="lead"Mo1VaSbbNbcZdO n (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≦aα as a source of X-ray, peaks at diffraction angles (2θ) of: 22.1��0.3��, 28.1��0.3��, 36.1��0.3�� and 45.2��0.3��; 7.8��0.3��, 8.9��0.3��, 22.1��0.3��, 27.1��0.3��, 35.2��0.3�� and 45.2��0.3��; or 7.8��0.3��, 8.9��0.3��, 22.1��0.3��, 27.1��0.3��, 28.1��0.3��, 35.2��0.3��, 36.1��0.3�� and 45.2��0.3��. 12. The process according to claim 1, wherein said oxide catalyst 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 process 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 process according to claim 1, wherein said oxide catalyst 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 process according to claim 14, wherein the calcination is performed at 500 to 700�� C. in an atmosphere of inert gas which is substantially free of molecular oxygen. 16. The process 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. The process according to claim 1, wherein d in formula (I) satisfies the following relationship: 0≦d≦0.4.