A process for producing a catalytically active multielement oxide comprising the elements Mo, W, V and Cu, wherein at least one source of the elemental constituents W of the multielement oxide is used to produce an aqueous solution, the resultant aqueous solution is admixed with sources of the elemental constituents Mo and V of the multielement oxide, drying of the resultant aqueous solution produces a powder P, the resultant powder P is optionally used to produce geometric shaped precursor bodies, and the powder P is or the geometric shaped precursor bodies are subjected to thermal treatment to form the catalytically active composition, wherein the aqueous solution used for drying comprises from 1.6% to 5.0% by weight of W and from 7.2% to 26.0% by weight of Mo, based in each case on the total amount of aqueous solution.

A process for producing a catalytically active multielement oxide comprising the elements Mo, W, V and Cu, wherein at least one source of the elemental constituents W of the multielement oxide is used to produce an aqueous solution, the resultant aqueous solution is admixed with sources of the elemental constituents Mo and V of the multielement oxide, drying of the resultant aqueous solution produces a powder P, the resultant powder P is optionally used to produce geometric shaped precursor bodies, and the powder P is or the geometric shaped precursor bodies are subjected to thermal treatment to form the catalytically active composition, wherein the aqueous solution used for drying comprises from 1.6% to 5.0% by weight of W and from 7.2% to 26.0% by weight of Mo, based in each case on the total amount of aqueous solution.

The present invention relates to a process for preparing carboxylic acids by oxidizing primary alcohols in the liquid phase in the presence of ruthenium dioxide as a catalyst.

The present invention relates to a process for preparing carboxylic acids by oxidizing primary alcohols in the liquid phase in the presence of ruthenium dioxide as a catalyst.

The present invention relates to a process for preparing carboxylic acids by oxidizing primary alcohols in the liquid phase in the presence of ruthenium dioxide as a catalyst.

A process for preparing sebacic acid by reacting in a first step (i) linoleic acid with water catalyzed by an oleate hydratase to form 10-hydroxy-12-octadecenoic acid, in a second step (ii) pyrolysing the 10-hydroxy-12-octadecenoic acid to 1-octene and 10-oxo-decanoic acid and in a third step (iii) oxidizing the 10-oxo-decanoic acid to sebacic acid.

A process for preparing sebacic acid by reacting in a first step (i) linoleic acid with water catalyzed by an oleate hydratase to form 10-hydroxy-12-octadecenoic acid, in a second step (ii) pyrolysing the 10-hydroxy-12-octadecenoic acid to 1-octene and 10-oxo-decanoic acid and in a third step (iii) oxidizing the 10-oxo-decanoic acid to sebacic acid.

A process for preparing sebacic acid by reacting in a first step (i) linoleic acid with water catalyzed by an oleate hydratase to form 10-hydroxy-12-octadecenoic acid, in a second step (ii) pyrolysing the 10-hydroxy-12-octadecenoic acid to 1-octene and 10-oxo-decanoic acid and in a third step (iii) oxidizing the 10-oxo-decanoic acid to sebacic acid.

[Problem to be Solved]

To provide a method for preparing a catalyst that has high activity and exhibits high durability with reduced elution of a catalyst metal when a liquid-phase oxidation reaction is brought about without combined use of an alkali; and a method for producing an oxide highly efficiently by use of the catalyst.

The method for preparing a catalyst has the following Steps 1, 2 and 3.

Step 1: preparing an aqueous dispersion of a catalyst carrying Pt on activated carbon;

Step 2: preparing an aqueous solution containing Bi in an ionic state; and

Step 3: adding the aqueous dispersion obtained in Step 1 to the aqueous solution obtained in Step 2.

[Problem to be Solved]

To provide a method for preparing a catalyst that has high activity and exhibits high durability with reduced elution of a catalyst metal when a liquid-phase oxidation reaction is brought about without combined use of an alkali; and a method for producing an oxide highly efficiently by use of the catalyst.

The method for preparing a catalyst has the following Steps 1, 2 and 3.

Step 1: preparing an aqueous dispersion of a catalyst carrying Pt on activated carbon;

Step 2: preparing an aqueous solution containing Bi in an ionic state; and

Step 3: adding the aqueous dispersion obtained in Step 1 to the aqueous solution obtained in Step 2.