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Chlorine-free bimetallic catalyst for gas phase synthesis of dimethyl carbonate and preparation and application

A technology of bimetallic catalyst and dimethyl carbonate, which is applied in the preparation of carbonate/haloformate, metal/metal oxide/metal hydroxide catalyst, and organic compound, can solve the problem of low catalytic activity, Chlorine loss, low product selectivity and other issues, to achieve good catalytic performance

Inactive Publication Date: 2013-01-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above results show that the traditional CuCl catalyst gas-phase synthesis of DMC has the problem of chlorine loss, while Cu / AC and Cu / Y chlorine-free catalysts have problems of low catalytic activity or low product selectivity

Method used

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  • Chlorine-free bimetallic catalyst for gas phase synthesis of dimethyl carbonate and preparation and application
  • Chlorine-free bimetallic catalyst for gas phase synthesis of dimethyl carbonate and preparation and application
  • Chlorine-free bimetallic catalyst for gas phase synthesis of dimethyl carbonate and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 4.99 g of Cu(CH 3 COO) 2 ·H 2 O, measure 250 mL of deionized water, add it to a beaker, and stir it magnetically for 10 min to form a 0.1 mol / L copper acetate aqueous solution; weigh 2.16 g of La(NO 3 ) 3 ·6H 2 O, measure 250 mL of deionized water, add it to a beaker, and stir it magnetically for 10 min to form a 0.02 mol / L aqueous solution of lanthanum nitrate.

[0035] (2) Weigh 60-80 mesh coconut shell activated carbon (specific surface area 1600 m 2 / g, pore volume 0.8 cm 3 g -1 ) 10.0 g, added to the above mixed solution, placed in an ultrasonic reactor and stirred for 240 min;

[0036] (3) Place the beaker in a constant temperature water bath, evaporate the solvent to dryness at 80°C, and dry the evaporated product in an oven at 110°C for 8 hours;

[0037] (4) The dried precursor is roasted in a tube furnace with nitrogen flow, the nitrogen flow rate is 30ml / min, and the heating program is as follows: first increase to 280°C at a rate of 6°C / min, ...

Embodiment 2

[0044] (1) Weigh 12.08 g of Cu(NO 3 ) 2 ·3H 2 O, measure 250 mL of deionized water, add it to a beaker, and stir it magnetically for 10 min to form a 0.2 mol / L copper nitrate aqueous solution; weigh 0.91 g of La(CH 3 COO) 3 ·H 2 O, measure 250 mL of deionized water, add it to a beaker, and stir it magnetically for 10 min to form a 0.01 mol / L aqueous solution of lanthanum acetate.

[0045] (2) Weigh 80-100 mesh shell activated carbon (specific surface area 2400 m 2 / g, pore volume 0.8 cm 3 g -1 ) 10.0 g, added to the above mixed solution, placed in an ultrasonic reactor and stirred for 280 min;

[0046] (3) Place the beaker in a constant temperature water bath, evaporate the solvent to dryness at 70°C, and dry the evaporated product in an oven at 100°C for 15 hours;

[0047] (4) The dried precursor is roasted in a tube furnace with nitrogen flow, the nitrogen flow rate is 30ml / min, and the heating program is as follows: first increase to 300°C at a rate of 3°C / min, and ...

Embodiment 3

[0050] (1) Weigh 24.16 g of Cu(NO 3 ) 2 ·3H 2 O, measure 100 mL of deionized water, add it to a beaker, and stir it magnetically for 10 min to form a 1.0 mol / L copper nitrate aqueous solution; weigh 4.25 g of Ce(CH 3 COO) 3 ·6H 2 O, measure 100 mL of deionized water, add it to a beaker, and stir it magnetically for 10 min to form a 0.1 mol / L cerium acetate aqueous solution.

[0051] (2) Weigh 100-120 mesh coconut shell activated carbon (specific surface area 2800 m 2 / g, pore volume 0.6 cm 3 g -1 ) 18.0 g, added to the above mixed solution, placed in an ultrasonic reactor and stirred for 250 minutes;

[0052] (3) Place the beaker in a constant temperature water bath, evaporate the solvent at 60°C, and dry the evaporated product in an oven at 90°C for 16 hours;

[0053] (4) The dried precursor is roasted in a tube furnace with nitrogen flow, the nitrogen flow rate is 60ml / min, and the temperature rise program is as follows: first rise to 250°C at a speed of 8°C / min, and...

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Abstract

A chlorine-free bimetallic catalyst for gas phase synthesis of dimethyl carbonate is characterized in that the catalyst comprises an active component of copper, an additive, and active carbon; on a metal basis, the catalyst comprises 10.0-25.0 wt% of Cu, 1.0-10.0 wt% of the additive, and 65-85 wt% of active carbon. The catalyst of the invention has the advantages of high conversion rate and good selectivity.

Description

technical field [0001] The invention belongs to a catalyst, its preparation method and application, and in particular relates to a chlorine-free bimetallic supported catalyst, its preparation method and its application in direct gas-phase oxidative carbonylation of methanol to synthesize dimethyl carbonate. Background technique [0002] Dimethyl carbonate (Dimethyl carbonate, DMC), non-toxic and easy to biodegrade, is the basic raw material to realize the non-phosgene green synthesis of other organic carbonates, and is known as the "new building block" of green organic synthesis. At present, among the industrial synthesis methods of DMC, the phosgene method has been eliminated due to the highly toxic raw materials, and the transesterification method is the main production method of DMC in China, but the price of raw material ethylene oxide or propylene oxide is greatly affected by the petrochemical industry, and the cost is relatively high . The synthesis of DMC by methanol...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/89B01J23/72B01J23/78C07C69/96C07C68/00
Inventor 郑华艳李忠孟凡会秦瑶张国强
Owner TAIYUAN UNIV OF TECH
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