Preparation method of copper-zinc catalyst

Abstract

The invention discloses a preparation method of a copper-zinc catalyst. The preparation method comprises the following steps: (1) carrying out a parallel flow gelling reaction on a mixed solution A and a sodium metaaluminate solution to obtain a slurry I, and aging; (2) adding a mixed solution B and a sodium carbonate solution into the aged slurry I obtained in the step (1) in a dropwise and parallel flow manner, carrying out a gelling reaction to obtain a slurry II, and aging; and (3) carrying out solid-liquid separation on the material obtained in the step (2), and drying, roasting and molding the solid phase to obtain the catalyst, wherein the mixed solution A is an aqueous solution containing a soluble 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 has the advantages of uniform distribution of active metal copper, good synergistic effect, large number of active metal active centers, improved activity, improved selectivity, improved thermal stability and prolonged service life.

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] As a basic chemical raw material and new energy, methanol has been paid more and more attention. It is widely used in organic synthesis, dyes, fuels, medicines, coatings and national defense industries. With the continuous growth of methanol demand and production capacity along with industrial development in recent years, methanol Its position in the national economy is becoming more and more important. Therefore, in order to further promote the development of the methanol industry, its production technology and catalyst performance need to be further improved.

[0003] 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 cataly...

Examples

Embodiment 1

[0036] Cu(NO 3 ) 2 ·3H 2 O, Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, added 116 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 190 rpm, the aging temperature was 75° C., the pH value was 7.2, and the aging time was 0.7 hours. After the aging is over, add the mixed solution B and the sodium carbonate solution into the aged ...

Embodiment 2

[0038] 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, added 188 grams of ethylenediamine tetramethylene phosphonic acid and mixed uniformly, and mixed solution A was prepared, and 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 54g / 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 7.0, and the gelation time was 0.8 hours to obtain the slurry I. The slurry I was aged under stirring, the stirring speed was 240 rpm, the aging temperature was 76° C., the aging pH value was 7.4, and the aging was 0.6 hours. After aging, the mixed solution B and sodium carbonate solution are added into the slurry I in par...

Embodiment 3

[0040] 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, and 195 grams of polyacrylic acid (molecular weight: 3000) and 95 grams of hydroxyethylene diphosphonic acid were added and mixed evenly 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 form mixed solution B. Add deionized water in the reaction tank, sodium metaaluminate solution (containing Al 2 o 335g / L) and mixed solution A were added into the reaction tank in parallel, the gelation temperature was 48°C, the pH value was 8.0, and the gelation time was 1.3 hours to obtain slurry I. The slurry I was aged under stirring, the stirring speed was 190 rpm, the aging temperature was 78° C., the aging pH value was 7.2, and the aging time was 0.5 hour. After the aging is finished, the mixed solution B and the sodium carbonate solution ...

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] As a basic chemical raw material and new energy, methanol has been paid more and more attention. It is widely used in organic synthesis, dyes, fuels, medicines, coatings and national defense industries. With the continuous growth of methanol demand and production capacity along with industrial development in recent years, methanol Its position in the national economy is becoming more and more important. Therefore, in order to further promote the development of the methanol industry, its production technology and catalyst performance need to be further improved.

[0003] 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 cataly...

Examples

Embodiment 1

[0036] Cu(NO 3 ) 2 ·3H 2 O, Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, added 116 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 190 rpm, the aging temperature was 75° C., the pH value was 7.2, and the aging time was 0.7 hours. After the aging is over, add the mixed solution B and the sodium carbonate solution into the aged ...

Embodiment 2

[0038] 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, added 188 grams of ethylenediamine tetramethylene phosphonic acid and mixed uniformly, and mixed solution A was prepared, and 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 54g / 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 7.0, and the gelation time was 0.8 hours to obtain the slurry I. The slurry I was aged under stirring, the stirring speed was 240 rpm, the aging temperature was 76° C., the aging pH value was 7.4, and the aging was 0.6 hours. After aging, the mixed solution B and sodium carbonate solution are added into the slurry I in par...

Embodiment 3

[0040] 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, and 195 grams of polyacrylic acid (molecular weight: 3000) and 95 grams of hydroxyethylene diphosphonic acid were added and mixed evenly 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 form mixed solution B. Add deionized water in the reaction tank, sodium metaaluminate solution (containing Al 2 o 335g / L) and mixed solution A were added into the reaction tank in parallel, the gelation temperature was 48°C, the pH value was 8.0, and the gelation time was 1.3 hours to obtain slurry I. The slurry I was aged under stirring, the stirring speed was 190 rpm, the aging temperature was 78° C., the aging pH value was 7.2, and the aging time was 0.5 hour. After the aging is finished, the mixed solution B and the sodium carbonate solution ...

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