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Hollow-structure catalyst and preparation method and application thereof

A hollow structure, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of differential bed pressure drop, the catalyst cannot be applied to industrial devices, and industrial reactors cannot be loaded, etc. achieve the effect of improving performance

Pending Publication Date: 2022-01-28
淄博市翔力致高新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strength of the microscopic hollow spheres obtained by this method is too low, resulting in a very low spheroidization rate, and the strength of the catalyst is still too low after being barely spheroidized, so it cannot be loaded into an industrial reactor. Unable to solve the problems of poor thermal conductivity and excessive bed pressure drop, which makes the catalyst unable to be applied to industrial devices and has no practical significance

Method used

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  • Hollow-structure catalyst and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The first step is the preparation of catalyst active components. First, in 5000g pure water, add 1000g ammonium molybdate, 61g ammonium metavanadate, 49g copper nitrate and 65.4g 85% phosphoric acid, heat up to 95-100°C while stirring and keep the temperature at reflux for 5h, cool to room temperature to obtain a solution (I). Then 29g of ferric nitrate and 100g of cesium nitrate were dissolved in 1000mL of deionized water to obtain solution (II). Under stirring conditions, solution (II) was slowly added dropwise to solution (I), followed by adding 450mL of 25% ammonia water , and stirred for 30 min to obtain a slurry material. Spray-dry the obtained slurry material, and then roast at 250°C for 10 hours to obtain catalyst active component powder. The average particle diameter of the catalyst active component powder is 25 μm, and the composition is P 1.1 Mo 11 V 1.0 Cu 0.5 Cs 1.0 Fe 0.2 ; Weighing part of the catalyst active component powder, as the first powder s...

Embodiment 2

[0054] The first step is the preparation of catalyst active components. First, in 5000g pure water, add 1000g ammonium molybdate, 60g ammonium metavanadate, 26g copper nitrate and 65.4g 85% phosphoric acid, heat up to 95-100°C while stirring and keep the temperature at reflux for 5h, cool to room temperature to obtain a solution (I). Then 55g of ferric nitrate and 201g of cesium nitrate were dissolved in 1000mL of deionized water to obtain solution (II), and under stirring conditions, solution (II) was slowly added dropwise to solution (I), followed by adding 400mL of 25% ammonia water , and stirred for 30 min to obtain a slurry material. Spray-dry the obtained slurry material, and then calcined at 250°C for 10 hours to obtain catalyst active component powder, the composition of which is P 1.1 Mo 11 V 1.0 Cu 0.27 Cs 2.0 Fe 0.4 ; Weighing part of the catalyst active component powder, as the first powder stand-by;

[0055] The second step is the preparation of the cataly...

Embodiment 3

[0058] The first step is the preparation of catalyst active components. First, in 5000g of pure water, add 955g of ammonium molybdate, 90.5g of ammonium metavanadate, 51g of copper nitrate and 65.4g of 85% phosphoric acid, heat up to 95-100°C under stirring and keep the temperature at reflux for 5h, cool to room temperature to obtain Solution (I). Then 63g of antimony nitrate and 57.7g of potassium hydroxide were dissolved in 500mL of deionized water to obtain solution (II). Under stirring conditions, solution (II) was slowly added dropwise to solution (I), followed by adding 410mL of 25% ammoniacal liquor, stir 30min, obtain slurry material. Spray-dry the obtained slurry material, and then calcined at 250°C for 10 hours to obtain catalyst active component powder, the composition of which is P 1.1 Mo 10.5 V 1.52 Cu 0.53 K 2.0 Sb 0.4 ; Weighing part of the catalyst active component powder, as the first powder stand-by;

[0059] The second step is the preparation of the ...

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Abstract

The invention provides a hollow-structure catalyst applied to a process for preparing methacrylic acid by oxidizing methylacrolein and a preparation method of the hollow-structure catalyst. The catalyst comprises a multi-component hollow spherical shell and a surface layer, wherein the surface layer is distributed on the surface of the multi-component hollow spherical shell in a layered manner; the component of the surface layer is a catalyst active component, and the multi-component hollow spherical shell is composed of a (catalyst active component)-b (K2O)-c (Al2O3); and the active component of the catalyst is heteropoly acid or heteropoly acid salt with a Keggin structure. Compared with a traditional catalyst, the hollow-structure catalyst has the advantages that the utilization rate of the active components is increased by about 50-100%, the conversion activity of methylacrolein is increased to 96% or above, the selectivity of methacrylic acid is kept at 97% or above, the heat conductivity coefficient is increased by about 30-50%, the bulk density is reduced by about 50-100%, and the highest air speed can be increased to 5000h <-1 > under the condition that the performance is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysts; in particular, it relates to a catalyst with a hollow structure used in the process of oxidizing methacrolein to produce methacrylic acid and a preparation method thereof. Background technique [0002] Methyl methacrylate is an organic compound, also known as MMA, an important chemical raw material and a monomer for the production of transparent plastic polymethyl methacrylate (plexiglass, PMMA). Methyl methacrylate is mainly used in the production of plexiglass casting, extrusion sheet and molding compound, followed by surface coatings. In recent years, with the rapid development of the world's information industry, computers and flat-panel TVs have adopted a large number of liquid crystal displays (LCDs) to replace traditional cathode ray tube (CRT) displays, which has continued to increase the consumption of LCDs. In addition, the demand for PVC impact modifiers ACR and MBS, bill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18B01J27/199B01J35/08B01J37/08C07C51/235C07C57/055
CPCB01J27/199B01J37/082C07C51/235B01J35/51C07C57/04
Inventor 侯俊琦王际东孙彪高步良朱淑军谭永放程玉春
Owner 淄博市翔力致高新材料有限责任公司
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