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A kind of copper-silicon catalyst and its preparation method and application

A catalyst, copper-silicon technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of improving stability, high catalytic performance, and low production cost

Active Publication Date: 2022-06-14
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

As early as 1993, U.S. Patent US5214219 disclosed a reaction process for the selective hydrogenolysis of glycerol to produce 1,2-propanediol using a supported Cu-Zn bimetal as a catalyst, but the reaction conditions of this process are harsh (temperature>220 °C, hydrogen pressure> 10 MPa), the amount of catalyst used is large, and the concentration of reaction substrate is low, so it is difficult to apply in industrial production
Chinese patents CN200610105255.X, CN200710305964.7, CN201110292276.8 and other patents disclose the application of nano-CuO-SiO2 catalysts modified by different additives in the hydrogenolysis of glycerol to 1,2-propanediol, although This type of catalyst shows good initial reaction performance under the reaction conditions of 180-200 ℃ and 3-6 MPa hydrogen, but the reaction stability of the catalyst needs to be improved, which limits its industrial application prospect
Chinese patents CN200710020031.3, CN201110062939.7 and CN 201610178462.1, as well as research papers (Appl.Catal. B, 2011, 101, 431) respectively reported the preparation of Cu-Al2O3 catalyst, but the activity of this type of catalyst is low, and the reaction temperature needs to be increased to increase the conversion rate of glycerol, and it is difficult to ensure the production of 1,2-propanediol at a higher temperature Selectivity, at the same time, due to the memory effect of the hydrotalcite structure, the catalyst is difficult to shape and maintain a stable structure in the reaction system, which is not suitable for continuous industrial production
[0004] In summary, there is still catalytic activity and / or target product selectivity in the development of copper-based catalysts suitable for the selective hydrogenolysis of glycerol to 1,2-propanediol Low cost, harsh reaction conditions, insufficient catalyst stability and high equipment requirements, which increase the difficulty of industrialization of the process

Method used

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  • A kind of copper-silicon catalyst and its preparation method and application

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preparation example Construction

[0025] The preparation method of this copper silicon catalyst:

[0026] Firstly, the amount of copper salt, additive metal salt, magnesium salt, and silica sol was converted according to the amount of catalyst components, and then deionized water was added to the copper salt, additive metal salt, and magnesium salt to obtain a 150 g / L salt solution; Under vigorous stirring, a precipitant solution with a concentration of 100 g / L was added dropwise to the salt solution until the pH value of the salt solution was greater than 11 to obtain a mixed solution; secondly, silicon with a mass concentration of 10-30% was added dropwise to the mixed solution. After the sol was added dropwise, it was aged at 50-80 °C for 4-24 h and then filtered to obtain a precipitate; finally, the precipitate was washed, dried at 110 °C for 12 h, and then roasted and reduced.

[0027] Wherein: copper salt refers to one or more of copper nitrates, sulfates, acetates and halides.

[0028] Auxiliary metal ...

Embodiment 1

[0033] Example 1 A copper-silicon catalyst, in parts by mass, the content of the active metal Cu in the catalyst is 60%, and the auxiliary agent CeO 2 The content is 4%, the carrier magnesium oxide content is 11%, and the balance is carrier SiO 2 .

[0034] Its preparation method: weigh 57.07g Cu(NO 3 ) 2 ·3H 2 O, 17.50g Mg(NO 3 ) 2 ·6H 2 O and 2.52g Ce(NO 3 ) 3 ·6H 2 O Add 510 mL of deionized water to obtain a 150 g / L salt solution; under vigorous stirring, add 100 g / L sodium hydroxide solution dropwise to the salt solution until the pH of the salt solution is greater than 11 to obtain a mixed solution ; 20.83 g of 30 wt% silica sol was added dropwise to the mixed solution. After the dropwise addition, it was aged at 70 °C for 4 h and filtered to obtain a precipitate; the precipitate was washed, dried at 110 °C for 12 h, and dried baked at 500 °C for 4 h; in 20% H 2 -N 2 In the mixed gas flow, it was reduced at 300°C for 4 h to obtain the reduced catalyst A.

Embodiment 2

[0035] Example 2 A copper-silicon catalyst, in parts by mass, the content of the active metal Cu in the catalyst is 30%, and the additive In 2 o 3 The content is 1%, the content of carrier magnesium oxide is 30%, and the balance is carrier SiO 2 .

[0036] Its preparation method: weigh 28.54 g Cu(NO 3 ) 2 ·3H 2 O, 47.72 g Mg(NO 3 ) 2 ·6H 2 O and 0.33 g In(NO 3 ) 3 4H 2 O Add 510 mL of deionized water to obtain a 150 g / L salt solution; under vigorous stirring, add 100 g / L sodium hydroxide solution dropwise to the salt solution until the pH of the salt solution is greater than 11 to obtain a mixed solution ; 32.50 g of 30 wt% silica sol was added dropwise to the mixed solution. After the dropwise addition, it was aged at 70 °C for 4 h and filtered to obtain a precipitate; the precipitate was washed, dried at 110 °C for 12 h, and dried baked at 500 °C for 4 h; in 20% H 2 -N 2 In the mixed gas flow, it was reduced at 300°C for 4 h to obtain the reduced catalyst B.

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Abstract

The present invention relates to a kind of copper-silicon catalyst, and this catalyst refers to that by mass fraction, by 1~10% additive MO x , Cu‑MO composed of 30%~70% active component Cu and carrier x / carrier; the carrier is MgO and SiO 2 mixture, and MgO accounts for 5%~30% of the total amount of catalyst, and the balance of catalyst is SiO 2 ; The auxiliary agent MO x refers to In 2 o 3 、Pr 2 o 3 、Sm 2 o 3 , La 2 o 3 , CeO 2 , Y 2 o 3 and MnO 2 One or more of them. At the same time, the invention also discloses the preparation method and application of the catalyst. The method of the invention is simple and low in cost, and the obtained catalyst has excellent dispersity and stability, can realize glycerol hydrogenolysis to prepare 1,2-propanediol at a high yield under mild conditions, and can easily realize industrialized large-scale production.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a copper-silicon catalyst and its preparation method and application. Background technique [0002] 1,2-Propanediol is an important monomer for the synthesis of unsaturated polyesters. It is the basic raw material for the preparation of epoxy resins, polyurethane resins, plasticizers, and surfactants. It is also widely used in industries such as food, medicine, and cosmetics. Currently, 1,2-propanediol is mainly produced in industry by hydration of the non-renewable petrochemical product propylene oxide. In recent years, with the rapid growth of demand and production of biodiesel, the production capacity of by-product glycerol has been greatly oversupplied. The preparation of 1,2-propanediol from bioglycerol provides a new method for its large-scale production. [0003] The selective hydrogenolysis of glycerol to 1,2-propanediol has received continuous attention. The key to this process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/14B01J23/825B01J23/83B01J23/889B01J37/03B01J37/18C07C29/60C07C31/20
CPCB01J21/14B01J23/83B01J23/825B01J23/8892B01J37/031B01J37/18C07C29/60C07C31/205
Inventor 陈静方伟国刘海龙
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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