The present specification provides a ferrite catalyst, a method for preparing the same and a method for preparing butadiene using the same.

Provided are a catalyst that suppresses production of a coke-like material and improves the long-term stability of the reaction, and a method for producing the catalyst. A composite metal oxide catalyst for conjugated diolefin production is used for producing a conjugated diolefin from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen by a catalytic oxidative dehydrogenation reaction, the catalyst having a relative intensity ratio of X-ray diffraction peaks represented by the following Formula (A):

0.9<Pr<3.0

Pr=Pi1/Pi2(A) (in the formula, Pi1 represents the maximum peak height at a 2 value in the range of 26.40.3 in the X-ray diffraction peaks; Pi2 represents the maximum peak height at a 2 value in the range of 28.50.3 in the X-ray diffraction peaks; and Pr represents the relative intensity ratio of Pi1 with respect to Pi2).

The present invention relates to a process for producing a composite material and also the composite material itself. The composite material contains a bismuth-molybdenum-nickel mixed oxide or a bismuth-molybdenum-cobalt mixed oxide and a specific SiO2 as pore former. The present invention also relates to the use of the composite material according to the invention for producing a washcoat suspension and also a process for producing a coated catalyst using the composite material according to the invention. Furthermore, the present invention also relates to a coated catalyst which has a catalytically active shell comprising the composite material according to the invention on a support body. The coated catalyst according to the invention is used for preparing [alpha],[beta]-unsaturated aldehydes from olefins.

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.

A catalyst for a fluidized bed ammoxidation reaction containing silica and a metal oxide, wherein a composite of the silica and the metal oxide is represented by the following formula (1).

Mo.sub.12Bi.sub.aFe.sub.bNi.sub.cCo.sub.dCe.sub.eCr.sub.fX.sub.gO.sub.h/(SiO.sub.2).sub.A (1) (in formula (1), X represents at least one element selected from the group consisting of K, Rb, and Cs, 0.1?a?1, 1?b?3, 1?c?6.5, 1?d?6.5, 0.2?e?1.2, f?0.05, and 0.05?g?1 are satisfied, h satisfies valences of constituent elements excluding silica, A represents a content of silica (% by mass) and satisfies 35?A?48, and values of ?, ?, and ? calculated from the following expressions (2), (3), and (4) satisfy 0.03???0.08, 0.2???0.4, and 0.5???2.)

?=1.5a/(1.5(b+f)+c+d) (2)

?=1.5(b+f)/(c+d) (3)

?=d/c (4)

A shaped catalyst body for heterogeneously catalyzed reactions of organic compounds in the gas-phase in fixed-bed reactors, containing an element from group 3 to 12 of the Periodic Table of the Elements, and having a three-lobed structure with a lateral surface around the lobes, a top cover and a bottom cover, as well as three continuous holes running from one cover side to the other cover side, wherein each hole is assigned to one lobe and wherein the cover sides have outwardly shaped arches, its production and a process for its use in the heterogeneously catalyzed reaction of an organic compound in the gas phase.

A method for producing butadiene comprises a step of obtaining a product gas containing butadiene, by feeding a raw-material gas containing straight-chain butene and an oxygen-containing gas containing molecular oxygen to a reactor and performing oxidative dehydrogenation reaction in the presence of a catalyst, wherein the catalyst comprises a composite oxide containing molybdenum and bismuth, and the concentration of hydrocarbons having 5 or more carbon atoms in the raw-material gas is 0.05 mol % to 7.0 mol %.

A catalyst for a fluidized bed ammoxidation reaction containing silica and a metal oxide, wherein a composite of the silica and the metal oxide is represented by the following formula (1).

Mo.sub.12Bi.sub.aFe.sub.bNi.sub.cMg.sub.dCo.sub.eCe.sub.fCr.sub.gZn.sub.hX.sub.iO.sub.j/(SiO.sub.2).sub.A (1)

(in formula (1), X is selected from the group consisting of K, Rb, and Cs, a, b, c, d, e, f, g, h, and i, each satisfy 0.1?a?1, 0.5?b?4, 0.5?c?6.5, 0.2?d?2.5, 0.5?e?7, 0.2?f?1.2, g?0.05, n?4, and 0.05?i?1, A represents a content of silica (% by mass) in the composite and satisfies 35?A?48, and values of ?, ?, and ? calculated by the following expressions (2), (3), and (4) satisfy 0.03???0.12, 0.1???0.7, and 0.2???4.)

?=1.5a/(1.5(b+g)+c+d+e+h) (2)

?=1.5(b+g)/(c+d+e+h) (3)

?=e/(c+d+h) (4)

A catalyst for oxidative dehydrogenation of butene and a method for producing the same are described. The method includes forming a first coprecipitate, forming a second coprecipitate, and mixing the first and second coprecipitates under conditions that product a catalyst having a favorable surface chemistry profile.

A ring-shaped catalyst may have a straight body part and a hollow body part, which is used when a gas-phase catalytic oxidation reaction of a material substance is conducted to produce a target substance, wherein a length of the straight body part is shorter than a length of the hollow body part and at least at one end part, a region from an end part of the straight body part to an end part of the hollow body part is concavely curved.