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Supported catalyst for synthesis of dimethyl carbonate, preparation method and using method thereof

A supported catalyst, dimethyl carbonate technology, applied in catalyst activation/preparation, chemical instruments and methods, carbon dioxide or inorganic carbonate preparation, etc., can solve the problem of uneven catalytic effect, unstable catalytic activity, volatile It can achieve the effect of high activity and stability, convenient repeated regeneration and activation, and easy separation.

Inactive Publication Date: 2011-02-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has a good application prospect, it still has technical defects such as unstable catalytic activity, easy deactivation, and uneven catalytic effect.

Method used

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  • Supported catalyst for synthesis of dimethyl carbonate, preparation method and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Accurately weigh 3gSiO 2 , add 40ml absolute ethanol, ultrasonically disperse for 1 hour; accurately weigh 0.1820gCu(NO 3 ) 2 ·3H 2 O, 0.1521gFe(NO 3 ) 3 9H 2 O and 0.2849g citric acid, dissolved in 20ml deionized water. Pour the citric acid solution of metal ions into the ultrasonically dispersed carrier, stir at room temperature for 24 h, and ultrasonically disperse for 1 h. Afterwards, the above mixed solution was evaporated to dryness at 60° C. and dried in an oven at 80° C. overnight. After calcining at 450° C. for 3 hours, and then reducing and activating with hydrogen at 500° C. for 3 hours, the catalyst was obtained.

[0022] Weigh 1g of the above-mentioned catalyst, add it to the catalytic bed of the fixed-bed catalytic micro-reactor device for reaction performance evaluation, adjust the ratio of carbon dioxide and methanol to 1:2, the reaction pressure is 1.2MPa, the temperature of the catalyst bed is 130°C, and a 7890F gas chromatograph is used The pr...

Embodiment 2

[0024] Preparation method as embodiment 1, carrier SiO 2 , and transition metal nitrate Cu(NO 3 )2·3H 2 O, Fe(NO 3 ) 3 9H 2 The amounts of O and complex citric acid are respectively: 3g, 0.8190g, 0.9130g and 1.4245g. The catalytic reaction test conditions are the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0026] Preparation method is the same as embodiment 1, carrier SiO 2 , and transition metal nitrate Cu(NO 3 )2·3H 2 O, Fe(NO 3 ) 3 9H 2 The amounts of O and complex citric acid are respectively: 3g, 0.4553g, 3.8070g and 2.8515g, the catalytic reaction test conditions are as in Example 1, and the results are shown in Table 1

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Abstract

The invention discloses a supported catalyst for synthesis of dimethyl carbonate, a preparation method and a using method thereof. The supported catalyst comprises active metal components, an auxiliary agent and a carrier, wherein the active metal components mainly comprise a copper-iron metal or a copper-iron ion-containing compound and the like; and preferably, the molar ratio of a copper element to an iron element in the active metal components is from 1:5 to 5:1. The preparation method comprises the following steps of: dispersing the active metal components and the auxiliary agent in the catalyst to the carrier completely and uniformly; and drying, roasting and reducing to obtain the catalyst. The using method comprises the following steps of: placing the catalyst in a catalyst bed ofa reaction device; and adjusting the temperature of the catalyst bed to be between 90 and 140 DEG C and the reaction pressure to be 0.3 to 3.0 MPa. When the molar ratio of carbon dioxide to carbinol is 1:4 to 4:1, the effect is best, wherein the carbon dioxide and the carbinol are reactants passing through the catalyst bed. Compared with the prior art, the invention has the characteristics of high activity, high selectivity and high stability and has the advantages of low price, ready availability, simple preparation, use and recovery operation and the like.

Description

technical field [0001] The invention relates to a supported catalyst, in particular to a supported catalyst for directly catalyzing carbon dioxide and methanol to synthesize dimethyl carbonate and a preparation and use method thereof. Background technique [0002] Dimethyl Carbonate (Dimethyl Carbonate, DMC for short) is a non-toxic, widely used organic synthesis intermediate, known as "green basic chemical raw material". The industrial synthesis of dimethyl carbonate mainly includes phosgene-methanol method, methanol oxidative carbonylation method, transesterification method and direct use of CO 2 and methanol synthesis. Among them, the direct synthesis of "greenhouse effect" gases carbon dioxide and methanol has been highly praised by scholars from all over the world in terms of environmental protection and economic benefits. However, the wide application of this synthetic method is limited due to the existence of problems such as low conversion rate, easy deactivation o...

Claims

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Application Information

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IPC IPC(8): C07C69/96B01J23/83B01J23/75B01J23/885B01J23/745B01J37/00C07C68/04
CPCY02P20/141
Inventor 孟跃中周莹杰肖敏王拴紧韩东梅张若昕
Owner SUN YAT SEN UNIV
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