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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 physicochemical properties of the catalyst, the dispersing effect of active components is not obvious, etc., and achieve a good synergistic effect, increase the active center, and increase the effect of synergy.

Active Publication Date: 2020-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above method changes the dispersion of copper on the catalyst after reduction and improves the activity of the catalyst by changing the preparation process of the copper-based catalyst or adding additives on this basis, but in the process of improving the dispersion of the copper component, it affects other components of the catalyst. Physical and chemical properties, the effect of improving the dispersion of active components is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Cu(NO 3 ) 2 ·3H 2 O, Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, added 142 grams of hydroxyethylidene diphosphonic acid and mixed uniformly to prepare mixed solution A, Cu 2+ The concentration is 2.8mol / L, Zn 2+ The concentration is 2.5mol / L. Cu(NO 3 ) 2 ·3H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to form a mixed solution B, Cu 2+ Concentration is 1.8mol / L, Al 3+ The concentration is 2.0mol / L. Add deionized water in the reaction tank, sodium metaaluminate solution (containing Al 2 o 3 42g / L) and the mixed solution A were added into the reaction tank concurrently, the gelling temperature was 60°C, the gelling pH was 7.5, and the gelling time was 0.9 hours to obtain slurry I. The slurry I was aged under stirring, the stirring speed was 210 rpm, the aging temperature was 75° C., the pH value was 7.0, and the aging time was 0.6 hours. After aging, the mixed solution B and sodium carbonate solution are added to the aged slurry I in ...

Embodiment 2

[0036] According to the method for embodiment 1, by the component content ratio of catalyst B in table 1, Cu(NO 3 ) 2 ·3H 2 O, Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, and 155 grams of polymaleic acid (molecular weight: 500) and 97 grams of hydroxyethylene diphosphonic acid were added and mixed evenly to prepare a mixed solution A. Cu(NO 3 ) 2 ·3H 2 O and Al 2 (SO 4 ) 3 18H 2 O was dissolved in deionized water to form mixed solution B. Add deionized water in the reaction tank, sodium metaaluminate solution (containing Al 2 o 3 50g / L) and the mixed solution A were added into the reaction tank in parallel, the gelation temperature was 55°C, the pH value of the gelation was 7.8, and the gelation time was 1.3 hours to obtain the slurry I. The slurry I was aged under stirring, the stirring speed was 210 rpm, the aging temperature was 74° C., the aging pH value was 6.9, and the aging was 0.7 hours. After aging, the mixed solution B and sodium carbonate sol...

Embodiment 3

[0038]According to the method for embodiment 1, by the component content ratio of catalyst C in table 1, Cu(NO 3 ) 2 ·3H 2 O, Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, added 280 grams of ethylenediamine tetramethylene phosphonic acid and mixed uniformly to form a mixed solution A, and Cu(NO 3 ) 2 ·3H 2 O and Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to form mixed solution B. Add deionized water in the reaction tank, sodium metaaluminate solution (containing Al 2 o 3 45g / L) and the mixed solution A were added into the reaction tank in parallel, the gelation temperature was 50°C, the pH value was 7.6, and the gelation time was 1.1 hours to obtain the slurry I. The slurry I was aged under stirring, the stirring speed was 230 rpm, the aging temperature was 75° C., the aging pH value was 7.2, and the aging time was 0.8 hours. After the aging is finished, the mixed solution B and the sodium carbonate solution are added into the slurry I in parallel...

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Abstract

The invention discloses a preparation method of a copper-zinc catalyst, which comprises the following steps: (1) carrying out parallel flow gelatinization reaction on a mixed solution A and a sodium metaaluminate solution to obtain slurry I, and aging the slurry I; (2) dropwise adding the mixed solution B and a sodium carbonate solution into the aged slurry I obtained in the step (1) in a parallelflow manner, carrying out a gelling reaction to obtain slurry II, and aging the slurry II; (3) filtering and drying the material obtained in the step (2), and treating the material with a mixed aqueous solution containing aluminum salt and organic acid; and (4) preparing a catalyst product from the material obtained in the step (3), wherein the mixed solution A is an aqueous solution containing asoluble copper salt, a soluble zinc salt and an organic auxiliary agent, and the mixed solution B is an aqueous solution containing a soluble copper salt and a soluble aluminum salt. The catalyst prepared by the method disclosed by the invention is uniform in active metal distribution, has a good synergistic effect, has a large number of active metal active centers, improves the activity, selectivity and thermal stability of the catalyst, and has a good application prospect.

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] In industry, methanol is generally used to contain H 2 , CO, CO 2 Syngas is produced under certain conditions of pressure, temperature and presence of catalysts. At present, medium and low pressure gas phase methods are widely used in the world to synthesize methanol, and the catalysts used are basically mixed oxides of copper, zinc and aluminum. Synthesis of CuO, ZnO, Al in Methanol Catalyst 2 o 3 The functions of the three components are different, CuO is the main active component, ZnO and Al 2 o 3 as an auxiliary agent. The addition of ZnO can make the catalyst form a Cu / Zn synergy, which greatly improves the activity and selectivity of the catalyst. 2 o 3 It not only acts as a skeleton in the catalyst, but also ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J35/10C07C29/154C07C31/04
CPCB01J23/002B01J23/80C07C29/154B01J2523/00B01J35/394B01J35/615B01J35/633B01J35/635B01J35/643B01J35/647B01J2523/17B01J2523/27B01J2523/31C07C31/04Y02P20/52
Inventor 王海涛徐学军王继锋刘东香
Owner CHINA PETROLEUM & CHEM CORP
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