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A kind of preparation method of copper zinc aluminum zirconium catalyst

A copper-zinc-aluminum, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Improve the effect of promotion, performance improvement, and promotion of promotion

Active Publication Date: 2019-09-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For zirconium hydroxides, the most active alpha zirconium hydroxide (Zr 4 (OH) 8 (OH) 8 ) will quickly transform into other forms of zirconium hydroxide at the above temperature, such as beta zirconium hydroxide or gamma zirconium hydroxide, which will greatly adversely affect the catalytic effect of zirconium oxide obtained after heat treatment on copper-zinc-aluminum catalysts

Method used

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  • A kind of preparation method of copper zinc aluminum zirconium catalyst

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Experimental program
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Effect test

Embodiment 1

[0016] Weigh 188g Cu(NO 3 ) 2 , 56.7g Zn(NO 3 ) 2 and 21.3g Al(NO 3 ) 2 Dissolve in 2000mL water and preheat to 80°C to form a mixed solution; use 1mol / L Na preheated to 80°C 2 CO 3 The aqueous solution and the above mixed solution were added to 500mL deionized water at 80°C in parallel flow, and the flow rate of the two solutions was controlled to maintain the pH of the deionized water=7. After aging for 1, the primary precipitate was obtained, and the Na was washed with deionized water + , and suction filtered to obtain copper-zinc-aluminum precipitate; weigh 15.95g Zr(NO 3 ) 4 Dissolve in 500mL, 0°C deionized water to obtain a zirconium solution, add ammonia water diluted to 1 / 10 to the above zirconium solution, control the end point pH=6, and obtain α zirconium hydroxide Zr 4 (OH) 8 (OH) 8 Stir the copper-zinc-aluminium-aluminum precipitate and α-zirconium hydroxide in 2000mL deionized water at 0°C for 30 minutes to obtain a copper-zinc-aluminum-zirconium precurs...

Embodiment 2

[0018] Weigh 169.2g Cu(NO 3 ) 2 , 85.05g Zn(NO 3 ) 2 and 191.7g Al(NO 3 ) 2 Dissolve in 2000mL water and preheat to 75°C to form a mixed solution; use 1mol / L NaHCO preheated to 75°C 3 Add the aqueous solution and the above mixed solution into 500mL deionized water at 75°C in parallel flow, control the flow rate of the two solutions to maintain the pH of the deionized water=7.2, obtain the primary precipitate after aging for 1, wash with deionized water to remove Na + , suction filtration to obtain copper-zinc-aluminum precipitate; weigh 54g α zirconium hydroxide Zr 4 (OH) 8 (OH) 8 Stir the copper-zinc-aluminium-aluminum precipitate and α-zirconium hydroxide in 2000mL deionized water at 1°C for 30min to obtain a copper-zinc-aluminum-zirconium precursor; wash the copper-zinc-aluminum-zirconium precursor with 100mL ethanol suction and filter the filter cake in It was dried in a drying oven at 70°C, then calcined at 350°C in a dry air atmosphere for 8 hours, and then flake...

Embodiment 3

[0020] Weigh 150.4g Cu(NO 3 ) 2 , 151.2g Zn(NO 3 ) 2 and 255.6g Al(NO 3 ) 2 Dissolve in 5000mL water and preheat to 80°C to mix the solution; use 0.5mol / L K preheated to 70°C 2 CO 3 Add the aqueous solution and the above mixed solution into 500mL deionized water at 70°C in parallel, control the flow rate of the two solutions to maintain the pH of the deionized water=7.5, and obtain the primary precipitate after aging for 1, wash with deionized water to remove K + , and suction filtered to obtain a copper-zinc-aluminum precipitate; weigh 51.04g Zr(NO 3 ) 4 Dissolve in 1000mL, 2°C deionized water to obtain a zirconium solution, add ammonia water diluted to 1 / 10 to the above zirconium solution, control the end point pH=7.0, and obtain α zirconium hydroxide Zr 4 (OH) 8 (OH) 8 ; Stir the copper-zinc-aluminum precipitate and α-zirconium hydroxide in 5000 mL of deionized water at 2°C for 30 minutes to obtain a copper-zinc-aluminum-zirconium precursor; wash the copper-zinc-a...

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Abstract

Belonging to the technical field of catalyst preparation, the invention in particular relates to a preparation method of a high-performance copper, zinc, aluminum and zirconium catalyst. The preparation method comprises the steps of: firstly using precipitation method to acquire a Cu-Zn-Al precipitate; then mixing the precipitate with alpha zirconium hydroxide Zr4(OH)8(OH)8 in water to obtain a precursor containing copper, zinc, aluminum and zirconium; then subjecting the copper, zinc, aluminum and zirconium precursor to washing and dehydration, conducting drying at 60-120DEG C, and performing roasting at 300-500DEG C for 3-10h, and finally conducting forming so as to obtain the copper, zinc, aluminum and zirconium catalyst. In the obtained catalyst, the assistant catalysis effect of zirconia is greatly enhanced, and the copper, zinc, aluminum and zirconium catalyst has significantly improved catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a highly active copper-zinc-aluminum-zirconium catalyst. Background technique [0002] Copper-zinc-aluminum catalysts are commonly used catalysts in industry, and are widely used in catalytic hydrogenation reactions, dehydrogenation reactions, and oxidation reactions. In order to improve the catalytic performance of copper-zinc-aluminum catalysts, the introduction of additives is a conventional method. As an amphoteric metal oxide, zirconia is often used as an additive in the modification of copper-based catalysts, such as improving the performance of copper-zinc-aluminum catalysts in CO 2 Catalytic performance in hydrogenation to methanol reaction, etc. The introduction of zirconium into the copper-zinc-aluminum catalyst usually adopts the co-precipitation method, and the higher the precipitation temperature is, the more favorab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80
Inventor 于杨陈海波魏士新殷玉圣
Owner CHINA PETROLEUM & CHEM CORP
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