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A kind of preparation method of copper-zinc catalyst

A catalyst, copper-zinc technology, applied in the field of preparation of copper-zinc catalysts, can solve the problems of affecting the physical and chemical properties of the catalyst, the dispersion effect of active components is not obvious, etc.

Active Publication Date: 2022-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The method mentioned above changes the dispersion of copper on the catalyst after reduction by changing the copper-based catalyst preparation process or adding additives on this basis, and improves the activity of the catalyst. In the process of improving the dispersion of copper components, other physical and chemical properties of the catalyst are affected, and the effect of improving the dispersion of active components is not obvious

Method used

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  • A kind of preparation method of copper-zinc catalyst
  • A kind of preparation method of copper-zinc catalyst
  • A kind of preparation method of copper-zinc catalyst

Examples

Experimental program
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Embodiment 1

[0034] The Cu(NO 3 ) 2 ·3H 2 O, Zn (NO 3 ) 2 ·6H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to make mixed solution A, Cu 2+ The concentration is 2.8mol / L, Zn 2+ The concentration is 2.5mol / L, Al 3+ The concentration is 3.6mol / L. The Cu(NO 3 ) 2 ·3H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to make mixed solution B, Cu 2+ The concentration is 1.8mol / L, Al 3+ The concentration is 2.0mol / L. Add deionized water into the reaction tank, add ammonia water with a weight concentration of 10wt% and mixed solution A into the reaction tank in parallel, the gel-forming temperature is 62°C, the gel-forming pH value is 7.5, and the gel-forming time is 1.0 hour to obtain a slurry I. The slurry I was aged under stirring, the stirring speed was 190 rpm, the aging temperature was 75° C., the pH value was 7.0, and the aging time was 0.7 hours. After the aging, the mixed solution B and the sodium carbonate solution were added to the aged slurry I, the ...

Embodiment 2

[0036] According to the method of Example 1, according to the component content ratio of catalyst B in Table 1, Cu(NO 3 ) 2 ·3H 2 O, Zn (NO 3 ) 2 ·6H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to prepare mixed solution A, Cu(NO 3 ) 2 ·3H 2 O and Al (NO 3 ) 3 ·9H 2 O was dissolved in deionized water to make mixed solution B. Add deionized water into the reaction tank, add ammonia water with a weight concentration of 12wt% and mixed solution A into the reaction tank in parallel, the gel-forming temperature is 55°C, the gel-forming pH value is 8.0, and the gel-forming time is 1.1 hours to obtain a slurry I. The slurry I was aged under stirring, the stirring speed was 225 rpm, the aging temperature was 73° C., the aging pH was 7.1, and the aging was 0.7 hours. After the aging, the mixed solution B and the sodium carbonate solution were added to the slurry I in parallel, the molar ratio of the amount of sodium carbonate to the total amount of copper and z...

Embodiment 3

[0038] According to the method of Example 1, according to the component content ratio of catalyst C in Table 1, Cu(NO 3 ) 2 ·3H 2 O, Zn (NO 3 ) 2 ·6H 2 O and Al (NO 3 ) 3 ·9H 2 O was dissolved in deionized water to prepare mixed solution A, Cu(NO 3 ) 2 ·3H 2 O and Al (NO 3 ) 3 ·9H 2 O was dissolved in deionized water to make mixed solution B. Deionized water was added to the reaction tank, and the weight concentration of 14wt% ammonia water and mixed solution A were added to the reaction tank in parallel, the gel formation temperature was 50° C., the pH value was 7.4, and the gel formation time was 0.9 hours to obtain slurry I. The slurry I was aged under stirring, the stirring speed was 200 rpm, the aging temperature was 73° C., the aging pH was 6.7, and the aging time was 0.5 hours. After the aging, the mixed solution B and the sodium carbonate solution were added to the slurry I in parallel, the molar ratio of the amount of sodium carbonate to the total amount...

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Abstract

The invention discloses a method for preparing a copper-zinc catalyst, which comprises the following contents: (1) co-flow gelation reaction of mixed solution A and ammonia water to obtain slurry I, followed by aging; (2) mixing solution B and carbonic acid The sodium solution is added dropwise to the aged slurry I in step (1), and a gel-forming reaction is carried out to obtain slurry II, which is then aged; (3) the material obtained in step (2) is separated from solid and liquid, and the solid phase is dried. , roasting and molding to obtain a catalyst; wherein mixed solution A is an aqueous solution containing soluble copper salt, soluble zinc salt and soluble aluminum salt, and mixed solution B is an aqueous solution containing soluble copper salt and soluble aluminum salt. The catalyst active metal copper and auxiliary zinc prepared by the method of the invention have uniform distribution, good synergistic effect and large number of active metal active centers, thereby improving the activity, selectivity and thermal stability of the catalyst for synthesizing methanol and the service life of the catalyst.

Description

technical field [0001] The invention relates to a preparation method of a copper-zinc catalyst, in particular to a preparation method of a copper-zinc catalyst with high activity, high selectivity and good heat resistance. Background technique [0002] Methanol has attracted more and more attention as a basic chemical raw material and new energy. It is widely used in organic synthesis, dyes, fuels, pharmaceuticals, coatings and defense industries. With the continuous growth of methanol demand and production capacity with industrial development in recent years, methanol Its status in the national economy is becoming more and more important. Therefore, in order to further promote the development of methanol industry, its production technology and catalyst performance need to be further improved. [0003] Industrial methanol generally contains H 2 , CO, CO 2 The synthesis gas is produced under certain conditions of pressure, temperature and the presence of a catalyst. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C07C31/04C07C29/154B01J35/10
CPCB01J23/80C07C29/154B01J35/635B01J35/633B01J35/615C07C31/04Y02P20/52
Inventor 马涛王海涛徐学军王继锋刘东香
Owner CHINA PETROLEUM & CHEM CORP