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Preparation method of coating catalyst and coating catalyst prepared by using method

A technology of coating catalysts and catalysts, applied in the direction of catalyst activation/preparation, preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of difficult to obtain mechanical strength catalysts, easy peeling of coatings, etc., achieve high strength, improve The effect of utilization

Active Publication Date: 2015-07-29
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent document CN01815995.8 mentions the production of coated catalysts to improve the effective utilization of catalyst components, but at the same time it is mentioned that it is difficult to obtain catalysts with high mechanical strength, because the coating is easy to peel off, and the bulk structure of the active catalytic substance directly determines Activity of Coated Catalysts
[0005] Therefore, when preparing heteropolyacid shaped catalysts, it should be considered comprehensively, not only to improve the bulk activity of heteropolyacid, but also to expose a large number of active sites of heteropolyacid while ensuring the strength of the catalyst, so as to improve the utilization rate of heteropolyacid. huge challenge

Method used

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  • Preparation method of coating catalyst and coating catalyst prepared by using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of catalyst

[0049] Add 490.50g molybdenum trioxide (MoO 3 ), 23.44g vanadium pentoxide (V 2 o 5 ), the phosphoric acid (H of 41.08g 85wt% mass concentration 3 PO 4 ), 24.71g 80wt% arsenic acid (H 3 AsO 4 ), 0.88g boric acid (H 3 BO 3 ), stirred and refluxed at 98°C for 1h, then added 2.40g of copper phosphate (Cu 3 (PO 4 ) 2 ·3H 2 O), 0.69g cuprous oxide (Cu 2 0), continue to reflux and stir to obtain a blue-green clear solution after 10h, the solution is spray-dried on an airflow spray dryer, the atomizing airflow pressure (absolute pressure) is 0.35MPa, and the speed of compressed air ejection from the nozzle is 1500m / s, the inlet temperature of the spray dryer is 140-150°C, the outlet temperature is 70-80°C, and the average particle size of the obtained catalyst powder is 2.5μm.

[0050] Get 200g of catalyst powder and disperse in 100g of ethanol with a water content of 5wt% to obtain slurry A (viscosity 100mPa·s), get 40g of polyvinyl...

Embodiment 2

[0055] Add 490.50g molybdenum trioxide, 20.84g vanadium pentoxide, 0.66g tungsten trioxide, 43.57g 85% mass concentration phosphoric acid, 29.65g 80wt% arsenic acid to 4000g deionized water, stir and reflux at 98°C for 1h Add 3.60g of copper phosphate, 1.04g of cuprous oxide and 3.35g of cupric oxide, and continue to reflux and stir for 10 hours to obtain a blue-green solution. The solution is spray-dried on an air-flow spray dryer. The atomizing airflow pressure is 0.25MPa, compressed The speed of air ejected from the nozzle is 1000m / s, the inlet temperature of the spray dryer is 140-150°C, the outlet temperature is 70-80°C, and the average particle size of the obtained catalyst powder is 3.2μm.

[0056] Get 200g catalyst powder and disperse in 120g dehydrated alcohol to obtain slurry A (viscosity 90mPa s), get 35g polyvinylpyrrolidone (average molecular weight is about 100,000) and dissolve in 40g dehydrated alcohol to obtain solution B (viscosity 150mPa s ), slurry A and so...

Embodiment 3

[0072] The catalyst was prepared with reference to Example 2, the difference being that the calcination procedure was as follows: stay in an air atmosphere at 50°C for 8h, stay in a nitrogen atmosphere at 350°C for 1h, and stay in an air atmosphere at 300°C for 3h. Finally, the composition of the heteropolyacid is obtained: Mo 12 P 1.4 V 0.8 Cu 0.3 As 0.6 W 0.01 o x . The wear index test result of the coated catalyst is 0.6%; the pore volume contained in the pores with a pore diameter of 100-2000 nm in the active component of the heteropoly acid outer layer accounts for 75% of the total pore volume, and the pore volume contained in the pores with a pore diameter of 100-500 nm The pore volume accounts for 35% of the total pore volume of the active components of the outer layer.

[0073] The methacrolein oxidation reaction was carried out in the same manner as in Example 1. After 50 hours of continuous reaction, the conversion rate of methacrolein was 80.1%, and the selec...

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Abstract

The invention relates to a preparation method of a coating catalyst and the coating catalyst prepared by using the method. The coating catalyst comprises a spherical inert carrier and polyvinylpyrrolidone-loading outer active components of heteropolyacid, wherein heteropolyacid uses phosphorus, molybdenum, vanadium, copper and arsenic as essential elements. In the catalyst preparation process, the slurry obtained by dispersing heteropoly acid catalyst powder into ethyl alcohol and an ethanol solution of polyvinylpyrrolidone are sprayed on the spherical inert carrier at the same time to obtain the coating catalyst. The coating catalyst forms specifically distributed holes after calcining, has high intensity and is high in conversion rate and selectivity when used to catalyze (methyl) acraldehyde to prepare (methyl) acroleic acid with vapour-phase oxidation.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a coated catalyst and a preparation method thereof. Background technique [0002] The gas-phase oxidation of methacrolein to methacrylic acid is one of the key steps in the three-step production of methyl methacrylate (MMA) from tert-butanol / isobutene. Polyacid Structure Catalyst. The industrial scale-up of heteropolyacid catalysts is a great challenge due to their low specific surface area and their difficulty in shaping. [0003] Patent document JP11-226411 proposes to add refined starch during catalyst molding and remove these starches during calcination to increase the pore volume of the catalyst; patent document CN101980781B proposes to add two different organic polymer binders before and after molding to increase the methyl Yield of acrylic acid; Patent Document JP08-010621 mentions that the particle size of the dried product of the mixed solution or slurry containing...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J35/02B01J35/10B01J31/36C07C57/055C07C51/235
Inventor 易光铨万毅初乃波于海彬曹传宗王磊黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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