Process for producing composite oxide catalyst

A technology of composite oxides and catalysts, applied in the preparation of organic compounds, catalyst activation/preparation, carbon-based compound preparation, etc., can solve the problems of insufficient catalyst performance such as raw material conversion rate or selectivity

Inactive Publication Date: 2005-11-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the molybdenum-bismuth composite oxide catalysts obtained by these existing technologies have insufficient catalyst performance such as raw material conversion rate or selectivity, and further improvement of catalyst performance is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (Preparation of composite oxide catalyst)

[0057] 94.1 g of ammonium paramolybdate was heated and dissolved in 400 ml of pure water. Then, 7.18 g of iron nitrate, 38.7 g of cobalt nitrate, and 25.8 g of nickel nitrate were heated and dissolved in 60 ml of pure water. The above solution was mixed slowly while stirring well.

[0058] Then, 0.85 g of borax and 0.36 g of potassium nitrate were dissolved in 40 ml of pure water under heating, and added to the slurry. Then, 19.9 g of ammonium nitrate was dissolved in 20 ml of pure water under heating, and added to the slurry. Next, add silica and stir well.

[0059] After heat-drying this slurry, it heat-processed at 300 degreeC / 1 hour in air atmosphere.

[0060] The obtained granular solid was pulverized and dispersed by adding 150 ml of pure water and 10 ml of ammonia water. Then, 58.1 g of bismuth subcarbonate in which 0.52% of sodium was solid-dissolved was added, and stirred and mixed.

[0061] After heating and dr...

Embodiment 2

[0073] 94.1 g of ammonium paramolybdate was dissolved in 400 ml of pure water under heating, and then 7.18 g of iron nitrate, 38.7 g of cobalt nitrate and 25.8 g of nickel nitrate were dissolved in 60 ml of pure water under heating. The above solution was mixed slowly while stirring well.

[0074] Then, 0.85 g of borax and 0.36 g of potassium nitrate were dissolved in 40 ml of pure water under heating, and added to the slurry. Then, 79.6 g of ammonium nitrate was dissolved in 80 ml of pure water under heating, and added to the above slurry. Then, 64 g of silica was added and fully stirred. After heat-drying this slurry, it heat-processed at 300 degreeC / 1 hour in air atmosphere.

[0075]The obtained granular solid was crushed, and 150 ml of pure water and 10 ml of ammonia water were added to disperse it. Then, 58.1 g of bismuth subcarbonate in which 0.52% by weight of sodium was solid-dissolved was added and stirred and mixed.

[0076] After heating and drying the slurry, t...

Embodiment 3

[0083] 94.1 g of ammonium paramolybdate was dissolved in 400 ml of pure water under heating. Then, 7.18 g of iron nitrate, 38.7 g of cobalt nitrate and 25.8 g of nickel nitrate were heated and dissolved in 60 ml of pure water. The above solution was mixed slowly while stirring well.

[0084] Then, 0.85 g of borax and 0.36 g of potassium nitrate were dissolved in 40 ml of pure water under heating, and added to the slurry. Then, 358.2 g of ammonium nitrate was dissolved in 360 ml of pure water under heating, and added to the above slurry. Then, 64 g of silicon dioxide was added and stirred well. After heat-drying this slurry, it heat-processed at 300 degreeC / 1 hour in air atmosphere.

[0085] The obtained granular solid was pulverized, and 150 ml of pure water and 10 ml of ammonia water were added to disperse it. Then, 58.1 g of bismuth subcarbonate in which 0.52% by weight of sodium was solid-dissolved was added and mixed with stirring.

[0086] After heating and drying th...

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Abstract

A catalyst for producing from an olefin the corresponding unsaturated aldehyde and unsaturated carboxylic acid in high yield; and a process for producing the catalyst. The process is for producing a composite oxide catalyst which is for use in catalytically oxidizing an olefin in a vapor phase with a gas containing molecular oxygen to produce the corresponding unsaturated aldehyde and corresponding unsaturated carboxylic acid, and which comprises (A) molybdenum, (B) bismuth, (C) cobalt and/or nickel, and (D) iron. It is characterized in that catalyst precursor particles produced through a preceding step in which an aqueous dispersion containing a raw material for the ingredient (A), raw material for the ingredient (C), and raw material for the ingredient (D) which have been united with one another and having a nitric acid radical content satisfying the relationship 1.2<=NO3/(3xFe+2x(Co+Ni)) is dried and then heated are united with a raw material for the ingredient (B) in a water-miscible solvent and the resultant united matter is dried and burned. In the relationship, NO3, Fe, Co, and Ni indicate the molar contents of nitric acid radicals, iron, cobalt, and nickel, respectively.

Description

technical field [0001] The invention relates to a method for preparing a composite oxide catalyst of corresponding unsaturated aldehydes and unsaturated carboxylic acids with high yield, good reproducibility and favorable preparation for gas-phase catalytic oxidation of olefins by gas containing molecular oxygen. Background technique [0002] In the past, catalysts for the gas-phase catalytic oxidation of propylene to acrolein and acrylic acid by molecular oxygen, and catalysts for the gas-phase catalytic oxidation of isobutene to methacrolein and methacrylic acid by a gas containing molecular oxygen have been Various proposals are proposed. [0003] From the standpoint of effective utilization of raw material olefin resources and rationalization of procedures in the reaction process, these catalysts are required to have higher catalytic performance in terms of olefin conversion or target product selectivity. In this case, for example, in the process of producing acrolein a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/88B01J23/00B01J23/31B01J23/887B01J37/00B01J37/02B01J37/03B01J37/04C07B61/00C07C45/35C07C47/22C07C51/215C07C51/25C07C57/05
CPCB01J37/0009B01J37/0215B01J37/031B01J23/31C07C45/35B01J23/002B01J37/0201B01J23/8876C07C51/252B01J2523/00
Inventor 嘉糠成康勅使河原力
Owner MITSUBISHI CHEM CORP
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