Preparation method of copper-zinc catalyst

A catalyst and copper-zinc technology, which is applied in the field of copper-zinc catalyst preparation, can solve the problems of low active center density, small surface active metal content, complex process, etc., and achieve high active site density, good coordination, and thermal stability. good stability effect

Active Publication Date: 2018-03-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The method for synthesizing methanol catalysts introduced in the above-mentioned patents is achieved by adding new additives (inorganic additives and organic additives), changing the catalyst preparation process (one-step process to two-step or three-step process) or changing the Al precursor. Increase the specific surface area of ​​the catalyst, change the grain size of CuO, adjust the proportion of catalyst components, and improve the dispersion of active components, so as to solve the problems of low activity and selectivity and short life of copper-based catalysts. There are disadvantages such as complex process, uneven dispersion of active components, small content of active metals

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  • Preparation method of copper-zinc catalyst
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  • Preparation method of copper-zinc catalyst

Examples

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Embodiment 1

[0032] Weigh Cu(NO 3 ) 2 ·3H 2 O168g, AlCl 3 ·6H 2 O95g, dissolved in 850mL deionized water to make working solution A, and Na 2 CO 3 Dissolve in 1000ml deionized water to prepare solution B. The molar ratio of sodium carbonate in solution B to copper and aluminum in solution A is 1.2. 500ml of water is added to the reaction tank and the temperature rises to 60°C. Under the condition of stirring, the solution A and the solution B are co-flowed into the reaction tank, the gel forming time is 1 hour, and the pH value of the gel slurry is controlled to be 7.4±0.2. Start aging while stirring, add 26g of nano zinc oxide, pH is 7.4±0.2 during aging, temperature is 75℃, aging for 2 hours, after aging, the material is filtered, and the filter cake is subjected to hydrothermal treatment under water vapor containing urea. The conditions of the heat treatment are: the molar ratio of urea to the total amount of active metal atoms is 5:1, the temperature is 230℃, the pressure is 4.5MPa, the ...

Embodiment 2

[0034] According to the method of Example 1, according to the composition ratio of the catalyst B in Table 1, copper nitrate and aluminum nitrate were added to the dissolution tank 1 to prepare working solution A, and sodium carbonate was added to the solution tank 2 to prepare working solution B , The molar ratio of sodium carbonate in solution B to copper and aluminum in solution A is 1.1, 600 mL of water is added to the reaction tank, and the temperature rises to 55°C. Under the condition of stirring, the solution A and the solution B are co-flowed into the reaction tank, the gel forming time is 1.2 hours, and the pH value of the gel slurry is controlled to be 7.2±0.2. Start aging under stirring. Add nano zinc oxide according to the component content of catalyst B in Table 1. When aging, the pH is 7.0 ± 0.2, the temperature is 70 ℃, and the aging is 3 hours. After aging, the material is filtered and the filter cake contains Hydrothermal treatment of urea is carried out under...

Embodiment 3

[0036] According to the method of Example 1, according to the component content ratio of catalyst C in Table 1, add copper nitrate, aluminum chloride, and manganese chloride to dissolving tank 1 to prepare working solution A, and add sodium carbonate to solution tank 2. Prepare working solution B. The molar ratio of sodium carbonate in solution B to copper and aluminum in solution A is 1.0. 800 mL of water is added to the reaction tank and the temperature is raised to 65°C. Under the condition of stirring, the solution A and the solution B are co-flowed into the reaction tank, the gel forming time is 1.5 hours, and the pH value of the gel slurry is controlled to be 7.4±0.2. Start aging under stirring. Add nano-zinc oxide according to the component content of catalyst B in Table 1. When aging, the pH is 7.2±0.2, the temperature is 80℃, and the aging is 2.5 hours. After aging, the material is filtered and the filter cake contains Hydrothermal treatment of urea is carried out unde...

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Abstract

The invention discloses a preparation method of a copper-zinc catalyst, wherein the preparation method includes the following contents: (1) dissolving Cu and Al soluble salts in water to prepare a solution A, and preparing a sodium carbonate solution B; (2) merging the solution A and the solution B and adding into a reaction tank, gelatinizing, then aging in a stirring condition, and adding nano zinc oxide in the gelatinizing and/or aging process; (3) filtering the slurry obtained in the step (2), and carrying out hydrothermal treatment on the obtained material with water steam, wherein urea is added during hydrothermal treatment; and (4) washing, filtering, drying, roasting and molding the material obtained in the step (3), and thus obtaining the copper-zinc catalyst. The copper-zinc catalyst prepared by the method has large active component copper oxide density in an epiphase, the utilization rate of active metal copper is high, the copper and zinc distribution is more uniform, the cooperation effect of the active metal copper and the auxiliary agent zinc is enhanced, a pore structure of the catalyst is reasonable, the activity, selectivity, heat stability of the catalyst for methanol synthesis are improved and the service life of the catalyst for methanol synthesis is prolonged.

Description

Technical field [0001] The invention relates to a method for preparing a copper-zinc catalyst, in particular to a method for preparing a copper-zinc catalyst with high activity, high selectivity and good heat resistance. Background technique [0002] Methanol is an extremely important chemical raw material, widely used in organic synthesis, dyes, fuels, medicine, coatings and national defense industries. Its output is second only to synthetic ammonia and ethylene, ranking third in the world. In recent years, methanol demand and production capacity have increased Industrial development continues to grow. [0003] Industrial methanol generally contains H 2 , CO, CO 2 The synthesis gas is produced under certain conditions of pressure, temperature and catalyst. At present, the medium and low pressure gas phase method is generally used to synthesize methanol in the world, and the catalyst used is basically a mixed oxide of copper, zinc and aluminum. CuO, ZnO, Al in methanol synthesis ...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J23/889B01J35/10
Inventor 王海涛徐学军刘东香冯小萍王继峰
Owner CHINA PETROLEUM & CHEM CORP
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