Method for preparing CuO/ZnO/Al*O* catalyst

A technology of catalyst and precipitant, which is applied in the field of preparing CuO/ZnO/Al2O3 catalyst by hypergravity precipitation method, can solve the problems of inability to realize continuous operation, uneven catalyst grain size, complicated preparation process, etc.

Inactive Publication Date: 2009-11-18
PETROCHINA CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

The co-precipitation of zinc and additives and the co-precipitation of copper and zinc are carried out separately, and the two filter cakes are mechanically mixed. The prepared catalyst has a high specific surface area, a large pore volume, and a reasonable pore size distribution. The catalyst has high activity and good thermal stability. characteristics, improve the yield of the target product, but due to CuO / ZnO / Al 2 o 3 The preparation process of the catalyst precursor cannot realize continuous operation, the preparation process is complicated, the repeatability is poor, the obtained catalyst grain size is not uniform, and the dispersion degree of active metal copper is not high
[0009] In order to overcome CuO / ZnO / Al prepared by traditional co-precipitation method 2 o 3 The defect of poor thermal stability of the catalyst, Chinese patent CN 1883795A discloses that the Daqing Petrochemical Research Institute adopts a step-by-step continuous coprecipitation method to prepare CuO / ZnO / Al 2 o 3 Gas phase aldehyde hydrogenation catalyst method

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  • Method for preparing CuO/ZnO/Al*O* catalyst
  • Method for preparing CuO/ZnO/Al*O* catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare a 1.3mol / L sodium carbonate solution, wherein sodium carbonate is an analytically pure reagent. The 1.3mol / L sodium carbonate solution is placed in the storage tank. [Cu(NO 3 ) 2 ]+[Zn(NO 3 ) 2 ]+[Al(NO 3 ) 3 ] The concentration of the mixed solution is 1.5mol / L, while [Cu(NO 3 ) 2 ] / [Zn(NO 3 ) 2 ] / [Al(NO 3 ) 3 ] for 3 / 7 / 1. The Cu(NO 3 ) 2 , Zn(NO 3 ) 2 and Al(NO 3 ) 3 The mixed solution is placed in a storage tank.

[0038] Turn on the water pump, preheat the hypergravity reactor, and adjust the circulating water temperature to 80°C. After the temperature of the two raw material solutions reached 80°C and the supergravity reactor was started, the Cu(NO 3 ) 2 , Zn(NO 3 ) 2 and Al(NO 3 ) 3 The mixed solution is pumped out from the storage tank 1 through the peristaltic pump, and the flow rate of the solution is controlled by adjusting the speed of the peristaltic pump. The metered mixed solution enters the rotary bed through the liquid in...

Embodiment 2

[0042] Change following conditions, other conditions are with embodiment 1.

[0043] The rotor speeds of the high gravity reactor were 200r / min, 400r / min, 700r / min, and 1300r / min, respectively, and the average particle sizes of CuO in the obtained catalysts were 10.8nm, 11.1nm, 9.3nm, and 11.6nm, respectively.

Embodiment 3

[0045] This example is to illustrate the effect of changing the flow rate of the precipitating agent, that is, adjusting the pH value of the reaction mixture on the product performance.

[0046] Change following conditions, other conditions are with embodiment 1. The flow rate of sodium carbonate solution was changed to 27.0L / h, 28.8L / h, 31.5L / h, 33.0L / h, and the average particle diameters of CuO in the obtained catalyst were 8.2nm, 9.1nm, 10.0nm, 10.7nm respectively.

[0047] According to the method of the present invention, since the reaction is carried out in the high-gravity rotating bed, the mass transfer process between the liquid and the liquid is greatly strengthened, so that the present invention prepares CuO / ZnO / Al 2 o 3 The reaction of the catalyst is completed instantly, and particles with small particle size and uniform distribution of components can be produced.

[0048] Further, the raw materials of the process are easy to obtain, the reaction time is short, t...

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Abstract

The invention relates to a method for preparing a CuO/ZnO/Al2O3 catalyst. Mixed solution containing Cu, Zn and Al reacts with precipitant in a high-gravity rotating-bed reactor at a temperature of between 50 and 90 DEG C, wherein the molar ratio of the mixed solution containing Cu, Zn and Al is 3/2-8/0.5-1.5; the aqueous-solution molar concentration of the mixed solution is 0.5 to 1.5 mol/L; the aqueous-solution molar concentration of the precipitant is 1.0 to 3.0 mol/L; the rotating speed of the high-gravity rotating-bed reactor is 200 to 1,500 r/min; and the volume-flow ratio of the mixed solution containing Cu, Zn and Al to the precipitant is 1/1-1/2. The method can improve production efficiency by 30 percent, freely adjusts the particle size of copper as an active component in a range between 5 and 20 nm, and is capable of continuous production.

Description

technical field [0001] The invention relates to a high-gravity precipitation method using a high-gravity rotating bed reactor to control and obtain uniform composition to prepare CuO / ZnO / Al 2 o 3 catalyst method. Background technique [0002] CuO / ZnO / Al 2 o 3 The catalyst is the main catalyst for gas-phase aldehyde hydrogenation reaction, low-pressure methanol synthesis, low-temperature water-gas shift reaction, selective hydrogenation, and some oxidation and dehydrogenation reactions. The catalyst is dissolved in Cu + ZnO as active phase, Al 2 o 3 as a cocatalyst. In order to prepare CuO / ZnO / Al with high catalytic activity 2 o 3 catalyst, it must be ensured that: (1) CuO and ZnO components are in full contact to form CuO with higher density + -ZnO binary active center; (2) make Al as far as possible 2 o 3 It is relatively uniformly dispersed in the catalyst and plays a role in stabilizing the structure. CuO / ZnO / Al 2 o 3 The technical key of the catalyst is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J37/03
Inventor 陈建峰张志华张鹏远吴显军初广文于春梅黄伟丽王刚侯晋田然刘彦峰李淑杰薛立香李晓文赵萍宋国玉
Owner PETROCHINA CO LTD
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