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Method for directly preparing dimethyl ether catalyst via carbon dioxide

A technology of carbon dioxide and dimethyl ether, which is applied in the field of preparing dimethyl ether catalysts, can solve the problems of poor catalytic performance and influence on catalyst activity, and achieve the effects of simple modification method, reduced amount of strong acid, and short cycle

Inactive Publication Date: 2015-03-25
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most widely used methanol synthesis components are CuO–ZnO–Al 2 o 3 catalyst, but this catalyst for CO 2 The catalytic performance of hydrogenation to dimethyl ether is poor, which is because Al 2 o 3 With strong hydrophilicity, water molecules will be generated during the synthesis of methanol and methanol dehydration, which will be adsorbed on Al 2 o 3 , thereby affecting the activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 2.94g Cu(NO 3 ) 2 ·3H 2 O, 2.92g Zn(NO 3 ) 2 ·6H 2 O , 1.05g Pr(NO 3 ) 3 Dissolved in 120 mL of absolute ethanol, 6.8g of oxalic acid was dissolved in 150 mL of absolute ethanol, the two co-precipitated in an 80-degree water bath, and the solution was at 80 o C was evaporated, the solvent was evaporated to dryness, dried in a constant temperature drying oven for 12 hours, and baked in a muffle furnace at 400 °C for 4 hours. Grinding and crushing the solid acid HZSM-5 with Si / Al=38, leaving 3g of particles below 200 mesh, and 0.33g of Sb 2 o 3 The analytically pure powder is ground, mixed thoroughly, and roasted at 600°C for 2 hours under the protection of argon. Mix the copper-based catalyst and the calcined modified HZSM-5 uniformly at a mass ratio of 2:1 to obtain a composite catalyst powder for the synthesis of dimethyl ether. The sample is pressed and crushed under a pressure of 15 MPa, and 20- 40 mesh particle test. Then the performance test result...

Embodiment 2

[0030] Weigh 2.94g Cu(NO 3 ) 2 ·3H 2 O, 2.92g Zn(NO 3 ) 2 ·6H 2 O , 1.05g Pr(NO 3 ) 3 Dissolved in 120 mL of absolute ethanol, 6.8g of oxalic acid was dissolved in 150 mL of absolute ethanol, the two co-precipitated in an 80-degree water bath, and the solution was at 80 o C was evaporated, the solvent was evaporated to dryness, dried in a constant temperature drying oven for 12 hours, and baked in a muffle furnace at 400 °C for 4 hours. Grind and crush the solid acid HZSM-5 with Si / Al=38, keep 3g of particles below 200 mesh, and mix with 0.50g Sb 2 o 3 The analytically pure powder is ground, mixed thoroughly, and roasted at 600°C for 2 hours under the protection of argon. Mix the copper-based catalyst and the calcined modified HZSM-5 uniformly at a mass ratio of 2:1 to obtain a composite catalyst powder for the synthesis of dimethyl ether. The sample is pressed and crushed under a pressure of 15 MPa, and 20- 40 mesh particle test. Then the performance test results ...

Embodiment 3

[0032] Weigh 2.94g Cu(NO 3 ) 2 ·3H 2 O, 2.92g Zn(NO 3 ) 2 ·6H 2 O , 1.05g Pr(NO 3 ) 3Dissolved in 120 mL of absolute ethanol, 6.8g of oxalic acid was dissolved in 150 mL of absolute ethanol, the two co-precipitated in an 80-degree water bath, and the solution was at 80 o C was evaporated, the solvent was evaporated to dryness, dried in a constant temperature drying oven for 12 hours, and baked in a muffle furnace at 400 °C for 4 hours. Grind and crush the solid acid HZSM-5 with Si / Al=38, keep 3g of particles below 200 mesh, and 0.66g Sb 2 o 3 The analytically pure powder is ground, mixed thoroughly, and roasted at 600°C for 2 hours under the protection of argon. Mix the copper-based catalyst and the calcined modified HZSM-5 uniformly at a mass ratio of 2:1 to obtain a composite catalyst powder for the synthesis of dimethyl ether. The sample is pressed and crushed under a pressure of 15 MPa, and 20- 40 mesh particle test. Then the performance test results are shown i...

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PUM

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Abstract

The invention provides a method for directly preparing a dimethyl ether catalyst via carbon dioxide, which relates to a method for preparing a dimethyl ether catalyst. The catalyst is prepared by mixing and grinding a copper-based catalyst and antimony modified HZSM-5 according to a certain mass ratio. The copper-based catalyst is prepared by an oxalate coprecipitation method: dissolving a soluble Cu salt and a soluble Zn salt in ethanol, and adding one or two soluble salts in Zr or Pr; dissolving a certain mass of oxalate in additional anhydrous ethanol; performing parallel coprecipitation on two solutions, stirring to evaporate the solvent, drying the precipitate, roasting the precipitate for 2-6 hours at a roasting temperature of 300-500 DEG C, and then cooling the precipitate to room temperature to obtain the copper-based catalyst. After the copper-based catalyst is mixed with the antimony modified HZSM-5, the activity of the method for directly preparing dimethyl ether catalyst via carbon dioxide hydrogenation is high and the selectivity is good.

Description

technical field [0001] The invention relates to a method for preparing a dimethyl ether catalyst, in particular to a method for directly preparing a dimethyl ether catalyst with carbon dioxide. Background technique [0002] Dimethyl ether (DME) has zero soot and particulate emissions, no accelerated soot, engine nitrogen oxides, particulates, carbon monoxide, non-methane hydrocarbons and aldehydes are lower than the world's most stringent emissions from California, the United States Standard, considered to be "clean energy in the 21st century". At the same time, dimethyl ether (DME) is an important chemical raw material. CO 2 One of the main greenhouse gases that cause the "greenhouse effect", CO 2 Excessive emissions have caused global environmental problems. CO 2 Hydrogenation of dimethyl ether (DME) is CO 2 The effective way of comprehensive utilization can not only break the thermodynamic balance to CO 2 Hydrogenation to methanol reaction is limited, and dimet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46C07C43/04C07C41/01
Inventor 张雅静吴渝任宝锦李西珍
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY