Disclosed is a gas distribution plate, comprising a metal plate, central openings and peripheral openings, wherein a ratio D1/D1′ of the aperture diameter D1 (expressed in a unit of mm) of the central opening to the aperture diameter D1′ (expressed in a unit of mm) of the peripheral opening satisfies the relation of 1.10≥D1/D1′>1.00. A fluidizing device comprising the gas distribution plate and application of the fluidizing device in an oxidation or ammoxidation reaction process are also disclosed. The gas distribution plate has an advantage of uniform gas distribution.

Disclosed is a gas distribution plate, comprising a metal plate, central openings and peripheral openings, wherein a ratio D1/D1′ of the aperture diameter D1 (expressed in a unit of mm) of the central opening to the aperture diameter D1′ (expressed in a unit of mm) of the peripheral opening satisfies the relation of 1.10≥D1/D1′>1.00. A fluidizing device comprising the gas distribution plate and application of the fluidizing device in an oxidation or ammoxidation reaction process are also disclosed. The gas distribution plate has an advantage of uniform gas distribution.

Provided is a composition for catalyst production which is used in the production of a catalyst for gas phase catalytic oxidation reaction or a catalyst for gas phase catalytic ammoxidation reaction, wherein the composition for catalyst production is an aqueous solution containing a niobium compound and hydrogen peroxide and optionally containing an organic acid, a molar ratio (organic acid/Nb) of a concentration of the organic acid to a Nb concentration is 0.00 or more and 2.00 or less, and a molar ratio (hydrogen peroxide/Nb) of a concentration of the hydrogen peroxide to a Nb concentration is 0.01 or more and 50 or less.

Provided is a composition for catalyst production which is used in the production of a catalyst for gas phase catalytic oxidation reaction or a catalyst for gas phase catalytic ammoxidation reaction, wherein the composition for catalyst production is an aqueous solution containing a niobium compound and hydrogen peroxide and optionally containing an organic acid, a molar ratio (organic acid/Nb) of a concentration of the organic acid to a Nb concentration is 0.00 or more and 2.00 or less, and a molar ratio (hydrogen peroxide/Nb) of a concentration of the hydrogen peroxide to a Nb concentration is 0.01 or more and 50 or less.

Provided is a composition for catalyst production which is used in the production of a catalyst for gas phase catalytic oxidation reaction or a catalyst for gas phase catalytic ammoxidation reaction, wherein the composition for catalyst production is an aqueous solution containing a niobium compound and hydrogen peroxide and optionally containing an organic acid, a molar ratio (organic acid/Nb) of a concentration of the organic acid to a Nb concentration is 0.00 or more and 2.00 or less, and a molar ratio (hydrogen peroxide/Nb) of a concentration of the hydrogen peroxide to a Nb concentration is 0.01 or more and 50 or less.

The present invention provides a method for producing an oxide catalyst containing antimony, comprising a step (A) of obtaining the oxide catalyst using antimony particles containing a diantimony trioxide as a source of the antimony, wherein an abundance of a pentavalent antimony in a surface layer of the antimony particle to be measured in XPS analysis is less than 70 atom %, and the antimony particle has an average particle size of 1.2 μm or less.

The present invention provides a method for producing an oxide catalyst containing antimony, comprising a step (A) of obtaining the oxide catalyst using antimony particles containing a diantimony trioxide as a source of the antimony, wherein an abundance of a pentavalent antimony in a surface layer of the antimony particle to be measured in XPS analysis is less than 70 atom %, and the antimony particle has an average particle size of 1.2 μm or less.

The present invention provides a method for producing an oxide catalyst containing antimony, comprising a step (A) of obtaining the oxide catalyst using antimony particles containing a diantimony trioxide as a source of the antimony, wherein an abundance of a pentavalent antimony in a surface layer of the antimony particle to be measured in XPS analysis is less than 70 atom %, and the antimony particle has an average particle size of 1.2 μm or less.

The present disclosure relates to fluid bed processes that utilize silica particles as a fluidization aid. The process comprises reacting one or more reactants in a reactor comprising a fluid bed to form a product. The fluid bed comprises a catalyst composition comprising a catalyst and an inert additive composition comprising silica particles from 0.5 wt % to 30 wt %, based on the total weight of the catalyst composition. The silica particles are discrete, inert particles that are mixed with the catalyst in the fluid bed.

The present disclosure relates to fluid bed processes that utilize silica particles as a fluidization aid. The process comprises reacting one or more reactants in a reactor comprising a fluid bed to form a product. The fluid bed comprises a catalyst composition comprising a catalyst and an inert additive composition comprising silica particles from 0.5 wt % to 30 wt %, based on the total weight of the catalyst composition. The silica particles are discrete, inert particles that are mixed with the catalyst in the fluid bed.