A novel mixed oxide material is disclosed which contains molybdenum, vanadium, tellurium and niobium and the use of the molybdenum mixed oxide material as catalyst for the oxidative dehydrogenation of ethane to ethene or the oxidation of propane to acrylic acid and a process for producing the mixed oxide material.

A novel mixed oxide material is disclosed which contains molybdenum, vanadium, tellurium and niobium and the use of the molybdenum mixed oxide material as catalyst for the oxidative dehydrogenation of ethane to ethene or the oxidation of propane to acrylic acid and a process for producing the mixed oxide material.

A novel mixed oxide material is disclosed which contains molybdenum, vanadium, tellurium and niobium and the use of the molybdenum mixed oxide material as catalyst for the oxidative dehydrogenation of ethane to ethene or the oxidation of propane to acrylic acid and a process for producing the mixed oxide material.

A process for producing unsaturated nitrile comprising a reaction step of subjecting hydrocarbon to a vapor phase catalytic ammoxidation reaction in a fluidized bed reactor to produce the corresponding unsaturated nitrile, wherein, in the reaction step, a powder is fed to a dense zone in the fluidized bed reactor using a carrier gas, and a ratio of a linear velocity LV1 of the carrier gas at a feed opening to feed the powder to the fluidized bed reactor to a linear velocity LV2 of a gas in the dense zone (LV1/LV2) is not less than 0.01 and not more than 1200.

A process for producing unsaturated nitrile comprising a reaction step of subjecting hydrocarbon to a vapor phase catalytic ammoxidation reaction in a fluidized bed reactor to produce the corresponding unsaturated nitrile, wherein, in the reaction step, a powder is fed to a dense zone in the fluidized bed reactor using a carrier gas, and a ratio of a linear velocity LV1 of the carrier gas at a feed opening to feed the powder to the fluidized bed reactor to a linear velocity LV2 of a gas in the dense zone (LV1/LV2) is not less than 0.01 and not more than 1200.

An oxide catalyst to be used for gas-phase catalytic ammoxidation reaction of propane or isobutane, the oxide catalyst comprising a composite oxide, wherein the composite oxide comprises a catalytically active species to be isolated from the composite oxide using a hydrogen peroxide solution, and the catalytically active species has an average composition represented by the following formula (1) in STEM-EDX measurements;

Formula:

Mo.sub.1V.sub.aSb.sub.bNb.sub.cW.sub.dX.sub.eO.sub.n   (1) wherein X represents at least one selected from the group consisting of Te, Ce, Ti, and Ta; a, b, c, and d satisfy relations represented by a formulae of 0.050≤a≤0.200, 0.050≤b≤0.200, 0.100≤c≤0.300, 0≤d≤0.100, 0≤e≤0.100, and a≤c; and n represents a number determined by valences of the other elements.

An oxide catalyst to be used for gas-phase catalytic ammoxidation reaction of propane or isobutane, the oxide catalyst comprising a composite oxide, wherein the composite oxide comprises a catalytically active species to be isolated from the composite oxide using a hydrogen peroxide solution, and the catalytically active species has an average composition represented by the following formula (1) in STEM-EDX measurements;

Formula:

Mo.sub.1V.sub.aSb.sub.bNb.sub.cW.sub.dX.sub.eO.sub.n   (1) wherein X represents at least one selected from the group consisting of Te, Ce, Ti, and Ta; a, b, c, and d satisfy relations represented by a formulae of 0.050≤a≤0.200, 0.050≤b≤0.200, 0.100≤c≤0.300, 0≤d≤0.100, 0≤e≤0.100, and a≤c; and n represents a number determined by valences of the other elements.

An oxide catalyst to be used for gas-phase catalytic ammoxidation reaction of propane or isobutane, the oxide catalyst comprising a composite oxide, wherein the composite oxide comprises a catalytically active species to be isolated from the composite oxide using a hydrogen peroxide solution, and the catalytically active species has an average composition represented by the following formula (1) in STEM-EDX measurements;

Formula:

Mo.sub.1V.sub.aSb.sub.bNb.sub.cW.sub.dX.sub.eO.sub.n   (1) wherein X represents at least one selected from the group consisting of Te, Ce, Ti, and Ta; a, b, c, and d satisfy relations represented by a formulae of 0.050≤a≤0.200, 0.050≤b≤0.200, 0.100≤c≤0.300, 0≤d≤0.100, 0≤e≤0.100, and a≤c; and n represents a number determined by valences of the other elements.

The present invention relates to catalyst compositions containing a mixed oxide catalyst of formula (I) or formula (II) as described herein, their preparation, and their use in a process for ammoxidation of various organic compounds to their corresponding nitriles and to the selective catalytic oxidation of excess NH.sub.3 present in effluent gas streams to N.sub.2 and/or NO.sub.x.

The present invention relates to catalyst compositions containing a mixed oxide catalyst of formula (I) or formula (II) as described herein, their preparation, and their use in a process for ammoxidation of various organic compounds to their corresponding nitriles and to the selective catalytic oxidation of excess NH.sub.3 present in effluent gas streams to N.sub.2 and/or NO.sub.x.