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Cu-based catalyst precursor and method for controlling its crystal phase crystallinity and Cu-based catalyst and preparation method thereof

A catalyst and precursor technology, applied in the field of catalyst preparation, can solve the problem of effectively adjusting the precursor, etc., which is not mentioned, and achieves the effects of convenient operation, simple process and increased specific surface area

Active Publication Date: 2021-11-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above technical literature synthesizes and explains the phases produced during the co-precipitation process, it does not mention the method of effectively adjusting the crystallinity of the main phase in the precursor, and the existing literature only involves the use of seed crystals to induce crystallization. efficient catalyst method

Method used

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  • Cu-based catalyst precursor and method for controlling its crystal phase crystallinity and Cu-based catalyst and preparation method thereof
  • Cu-based catalyst precursor and method for controlling its crystal phase crystallinity and Cu-based catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0062] Dissolve the mixture containing 2.2kg of copper nitrate, 1.0kg of zinc nitrate, 0.8kg of aluminum nitrate and 0.07kg of magnesium nitrate in 5.5L of deionized water to make a 7.5L aqueous solution, which is referred to as solution A;

[0063] Dissolve 1.6kg of sodium carbonate in 6.8L of deionized water to make a 7.5L solution, which is referred to as solution B;

[0064] Preheat solution A and solution B to 70°C for use.

[0065] Under stirring, the solution A and the solution B were co-precipitated, the temperature was controlled at 80°C during the precipitation process, and the pH value at the end of the precipitation was controlled at 8. The precipitated suspension was aged at 80° C. for 4 h, and then filtered through a Buchner funnel to obtain a catalyst precursor.

Embodiment 1-1

[0067] Wash the catalyst precursor prepared in Example 1 with water until the conductivity is less than 50μs / cm, collect the filter cake and place it in a 250mL crucible, then directly transfer it to an oven, set the drying temperature of the oven to 110°C, and dry at this temperature 18h. Then the dried catalyst precursor was crushed into particles of about 2 mm and transferred to a muffle furnace for calcination at a temperature of 400° C. for 3 h. Ready to use after molding.

[0068] in, figure 1 shows the XRD pattern of the catalyst prepared by the slow drying method of this embodiment. The diffraction peak at 11.6-11.9° is the main peak of hydrotalcite, crystal plane (003), and the diffraction peak at 31.9-32.2° is the main peak of copper-zinc malachite, a mixture.

Embodiment 1-2

[0070] The catalyst precursor prepared in Example 1 was washed with water until the conductivity was less than 50 μs / cm, and 10 min of ultrasonic vibration (frequency of 40 kHz) was added during the washing and beating process; the filter cake was collected and placed in a 250 mL crucible, and then directly transferred to Oven, set the oven drying temperature to 110°C, and dry at this temperature for 18 hours. Then the dried catalyst precursor was crushed into particles of about 2 mm and transferred to a muffle furnace for calcination at a temperature of 400° C. for 3 h. Ready to use after molding.

[0071] in, figure 1 shows the XRD pattern of the catalyst prepared by the slow drying method of this embodiment.

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Abstract

The invention relates to the field of catalyst preparation, and discloses a Cu-based catalyst precursor and a method for regulating its crystal phase crystallinity, a Cu-based catalyst and a preparation method thereof. The method includes: sequentially preparing the Cu-based catalyst precursor prepared by a co-precipitation method Washing and drying are carried out, and the crystal phase crystallinity of the Cu-based catalyst precursor is regulated to contain 5 to 80% by weight of the crystal phase hydrotalcite-like by controlling the drying process, and the drying method is a slow drying method or The quick-drying method, the slow-drying method includes drying the precursor at 40-120° C. for 10-100 hours; the quick-drying method includes introducing the precursor into a spray dryer at a temperature of 140-200° C. for drying. The aforementioned method of the present invention can effectively regulate the crystal phase crystallinity of the Cu-based catalyst precursor, thereby effectively regulating the crystallinity of different phases in the co-precipitated precursor mixture, and further increasing the specific surface area, activity and stability of the catalyst.

Description

technical field [0001] The present invention relates to the field of catalyst preparation, in particular, to a method for regulating the crystal phase crystallinity of a Cu-based catalyst precursor, a Cu-based catalyst precursor obtained by regulating and controlling the method, a method for preparing a Cu-based catalyst, and the method for preparing a Cu-based catalyst. Methods prepared Cu-based catalysts. Background technique [0002] Methanol, as an important member of C1 chemistry, is widely used in the basic chemical raw materials including the synthesis of formaldehyde, acetic acid, methyl tert-butyl ether and other fine chemicals. In recent years, it has also been used in the field of non-fossil fuels for vehicles . The global methanol demand and annual production capacity are also increasing year by year. Research and development of methanol catalysts with high activity, stability and long life is the key to ensure that methanol production capacity matches demand. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C07C29/154C07C31/04
CPCC07C29/154B01J23/007B01J23/80B01J37/0236B01J37/03B01J35/613B01J35/633C07C31/04Y02P20/52
Inventor 徐晓颖张玉龙狄伟张凡刘媛缪平
Owner CHNA ENERGY INVESTMENT CORP LTD
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