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Dimethyl carbonate supported catalyst directly synthesized by methanol and carbon dioxide

A supported catalyst, dimethyl carbonate technology, applied in the preparation of carbon dioxide or inorganic carbonate, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of unstable catalytic performance, Catalytic effects vary, easy to deactivate, etc., to achieve the effect of easy recycling, simple preparation steps and use methods, and inhibition of agglomeration

Inactive Publication Date: 2010-01-27
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carrier used in this catalyst needs to be pretreated by complicated steps, the catalytic performance is unstable, easy to deactivate, and the catalytic effect is different. The difference in the catalytic performance of the prepared catalyst can reach more than 6 times.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 30 g of 300-mesh white-gray refined diatomite carrier with an electronic balance, soak it in 5% dilute hydrochloric acid, stir and wash for 24 hours. Then it was washed with deionized water until neutral, and dried at 120°C for 10 hours.

[0026] Use an electronic analytical balance to accurately weigh 5g of the above-mentioned processed diatomite carrier, 0.3110gNi(NO 3 ) 2 ·6H 2 O, 0.5165g Cu(NO 3 ) 2 ·3H 2 O, 30mL of 25% ammonia water were all placed in a 150mL single-necked round-bottomed flask, stirred at room temperature for 24 hours, then ultrasonically dispersed for 3 hours, then evaporated to dryness at 70°C, dried at 100°C for 12 hours, ground and dried at 300°C Mesh sieve. Finally, it was calcined in a muffle furnace at 350°C for 3 hours, and in a tube reduction furnace under 5% H 2 / 95%N 2 Reductive activation at 600°C for 1 hour.

[0027] Weigh 2.5g of the above-mentioned reduction-activated catalyst and load it on the catalytic bed of the MR...

Embodiment 2

[0029] As in Example 1, but diatomaceous earth, Ni(NO 3 ) 2 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 The amount of O added was 5g, 0.6220g and 1.0330g respectively; the catalyst bed temperature in the catalytic process was 130°C.

Embodiment 3

[0031] As in Example 1, but diatomaceous earth, Ni(NO 3 ) 2 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 The amount of O added was 5g, 0.9330g and 1.5495g respectively; the catalyst bed temperature in the catalytic process was 140°C.

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Abstract

The invention discloses a dimethyl carbonate supported catalyst directly synthesized by methanol and carbon dioxide and a preparation method and a use method. The catalyst adopts diatomite as carrier, transition metal copper and nickel as main components of active components and zinc, iron, cobalt and the like as additives, wherein, the weight percent of diatomite in the catalyst is 60-95%, the weight percent of the transition metals is 5-30% and the weight percent of the additives is 0-15%. The preparation method comprises the following steps: soaking the carrier in a mixed solution of soluble transition metal salt and the additives, dispersing with ultrasound, evaporating and drying, calcining and reducting with hydrogen to obtain the supported catalyst. The use method comprises the following steps: placing the catalyst in a reaction device, adjusting the molar ratio of gas phase methanol to carbon dioxide to 2:1-3:1, and performing a reaction at 110-140 DEG C under the pressure of 0.6-3.0 MPa. The catalyst has the advantage of simple preparation steps, good stability and high catalytic efficiency and overcomes the defect that the carrier used by the existing catalyst needs be processed through complicated steps for pretreatment and has high price and instable catalytic performance.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a supported catalyst, a preparation method and a use method thereof, which are used for directly synthesizing methanol and carbon dioxide into dimethyl carbonate. Background technique [0002] Carbon dioxide is currently recognized as the main greenhouse gas, but at the same time it is a potential natural carbon source. Therefore, the development and utilization of carbon dioxide has become a hot topic for human beings to kill two birds with one stone. Among them, the synthesis of dimethyl carbonate using carbon dioxide as a carbon source is a hot topic. one of the issues. [0003] Dimethyl carbonate (referred to as "DMC") is not only an environmentally friendly organic chemical product (can be used as gasoline additives, chemical solvents, etc.), but also a low-toxic chemical intermediate (can be used as a synthetic polycarbonate and dye The intermediate of DMC can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J23/755B01J37/02B01J23/80C07C69/96C07C68/04
CPCY02P20/141
Inventor 孟跃中陈勇肖敏王拴紧韩东梅陈惠玲
Owner SUN YAT SEN UNIV
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