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Preparation method and application of supported catalyst for catalyzing dimethyl oxalate hydrogenation

A technology for catalyzing dimethyl oxalate and supported catalysts, applied in the preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve problems such as catalyst deactivation, and achieve Improve catalytic performance, improve stability and selectivity, reduce the effect of carbon deposition

Active Publication Date: 2022-05-24
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The movement of metal atoms at high temperature will lead to agglomeration of well-dispersed copper nanoparticles, resulting in rapid deactivation of the catalyst

Method used

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  • Preparation method and application of supported catalyst for catalyzing dimethyl oxalate hydrogenation
  • Preparation method and application of supported catalyst for catalyzing dimethyl oxalate hydrogenation

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Experimental program
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Effect test

Embodiment 1

[0028] The preparation method of the supported catalyst for catalyzing the hydrogenation of dimethyl oxalate of the present embodiment, the method is:

[0029] S1, dissolving copper nitrate in deionized water a, then adding an ammonia solution whose mass fraction is 25% to obtain a precursor solution; the consumption ratio of the copper nitrate, deionized water a and the ammonia solution is 7.6g:30mL:25mL ; copper in the precursor solution exists in the form of copper ammine complex, Cu(NH 3 ) 4 (NO 3 ) 2 It is conducive to ion exchange with silanol on the surface of the carrier, and finally forms Cu-O-Si units;

[0030] S2, using the carrier (nano silica) to make the carrier absorb moisture until the water mass fraction is 1% under the conditions of constant temperature and constant humidity with a temperature of 20° C. and a relative humidity of 50% to obtain a wet carrier;

[0031] Sufficient water molecules on the wet carrier surface and the silicon-oxygen bond on the ...

Embodiment 2

[0040] The preparation method of the supported catalyst for catalyzing the hydrogenation of dimethyl oxalate of the present embodiment, the method is:

[0041] S1, copper nitrate is dissolved in deionized water a, then add the ammonia solution whose mass fraction is 28% to obtain precursor solution; the consumption ratio of described copper nitrate, deionized water a and ammonia solution is 7.6g:30mL:40mL ;

[0042] S2, under the condition of constant temperature and constant humidity of the temperature of 40 ℃ and the relative humidity of 80% of the carrier (nano silica), the carrier is hygroscopic until the water mass fraction is 3% to obtain a wet carrier;

[0043] S3, after dissolving the soluble metal salt (cerium nitrate) in deionized water b, add the wet carrier obtained in S2, stir and disperse to obtain a suspension; the consumption ratio of the soluble metal salt, deionized water b and the wet carrier is 0.4g: 100mL: 5.97g; the amount of the wet carrier is SiO 2 co...

Embodiment 3

[0048] The preparation method of the supported catalyst for catalyzing the hydrogenation of dimethyl oxalate of the present embodiment, the method is:

[0049] S1, copper nitrate is dissolved in deionized water a, then adding mass fraction is 25%~28% ammonia solution, obtains precursor solution; The consumption ratio of described copper nitrate, deionized water a and ammonia solution is 7.6g: 30mL: 30mL;

[0050] S2, the carrier (pure silicon molecular sieve molecular sieve MCM-41) at a temperature of 20 ° C and a relative humidity of 50% under the conditions of constant temperature and constant humidity, the carrier is hygroscopic until the water mass fraction is 1% to obtain a wet carrier;

[0051] S3, after dissolving the soluble metal salt (calcium nitrate) in deionized water b, add the wet carrier obtained in S2, stir and disperse to obtain a suspension; the consumption ratio of the soluble metal salt, deionized water b and the wet carrier It is 0.5g: 100mL: 6.0g; the am...

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Abstract

The invention provides a preparation method of a supported catalyst that catalyzes the hydrogenation of dimethyl oxalate. The method is as follows: dissolving copper nitrate in deionized water a, adding ammonia solution to obtain a precursor solution; dissolving soluble metal salt in After deionized water b, the carrier is humidified to obtain a suspension; the precursor solution is added dropwise to the suspension, after ion exchange, ammonia is distilled, washed, dried, and then roasted to obtain a supported catalyst. Also provided is the application for catalyzing the hydrogenation of dimethyl oxalate to prepare ethylene glycol under low temperature and low pressure conditions. The invention uses a wet carrier and controls the water content of the precursor to improve the catalytic hydrogenation performance. The soluble metal salt is loaded on the surface of the wet carrier by the precipitation method, ion exchanged first, and then treated with ammonia to ensure that the precursor is not completely dry, which changes the metal-carrier interaction on the carrier surface, and makes up for the lack of low loading capacity of the ion exchange method. Improve the hydrogenolysis ability and catalytic performance of the supported catalyst, and efficiently catalyze the hydrogenation of dimethyl oxalate to ethylene glycol at low temperature and low pressure.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of a supported catalyst for catalyzing the hydrogenation of dimethyl oxalate. Background technique [0002] Ethylene glycol is mainly used in the production of polyester, antifreeze, membrane, etc. In the past 10 years, the average growth rate of ethylene glycol consumption in China is higher than 9.8%, however, more than 60% of ethylene glycol products are imported from other countries. With the rapid development of the polyester industry, the demand for ethylene glycol will continue to increase. [0003] The traditional ethylene glycol production technology is through ethylene oxidation and ethylene oxide hydration reaction, namely the oil-based ethylene glycol (OTEG) route. Although this technology is mature, it is highly dependent on petroleum resources, and my country's energy structure is composed of many coal, The charact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J23/80B01J29/03C07C29/149C07C31/20
CPCB01J23/80B01J23/83B01J29/0333B01J29/03C07C29/149C07C31/202Y02P20/52
Inventor 贠宏飞赵鹬阚显王东亮李贵贤
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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