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Preparation and application of dimethyl carbonate catalyst

A dimethyl carbonate and catalyst technology, which is applied in the preparation and application field of dimethyl carbonate catalyst, can solve the problems such as the large gap between catalyst performance and activity, and achieve the effect of excellent conversion rate and selectivity

Pending Publication Date: 2021-01-22
JIANGSU JINJU ALLOY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation raw materials and preparation methods are diverse, and the performance and activity of catalysts vary widely.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] 1. Preparation of modified alumina

[0027] Impregnated aluminum oxide with equal volume of chlorosulfonic acid at room temperature for 12 hours, then washed with 500 mL of deionized water, filtered three times with suction, and dried at 120°C for 12 hours to obtain activated aluminum oxide;

[0028] Take a certain amount of activated alumina and place it in the high-pressure reactor, start the temperature control program, feed ammonia gas at a rate of 100mL / min under the pressure of 2.0-3.0MPa, start the temperature control program to control the reactor temperature to 40-60°C , keep the temperature for 4h, and obtain modified alumina after cooling;

[0029] 2. Preparation of catalyst

[0030] Take a certain amount of palladium chloride, dissolve it in 1% dilute nitric acid, configure a certain concentration of palladium chloride solution, impregnate the palladium chloride solution and modified aluminum oxide in equal volumes for 4 hours, dry at 120°C for 12 hours, an...

Embodiment 1

[0034] 1. Preparation of modified alumina

[0035] Take 4g of chlorosulfonic acid and 10g of alumina at room temperature and impregnate them for 12h by equal-volume impregnation, then filter and wash them with 500mL of deionized water three times, and dry at 120°C for 12h to obtain activated alumina.

[0036] Take 10g of activated alumina and place it in a high-pressure reactor, increase the system pressure to 2.0MPa, feed 100mL / min ammonia gas, start the temperature control program to control the reactor temperature at 60°C, keep the temperature for 4 hours, and obtain modified trioxide after cooling aluminum.

[0037] 2. Preparation of alumina-based palladium catalyst

[0038] Take 4mL of dilute nitric acid solution containing 0.1667g of palladium chloride, impregnate it with modified alumina for 4h at room temperature, dry at 120°C for 12h, and roast at 400°C for 4h in air atmosphere, and obtain palladium catalyst supported on alumina after cooling .

[0039] 3. Applicat...

Embodiment 2

[0042] 1. Preparation of modified alumina

[0043] Take 4g of chlorosulfonic acid and 10g of alumina at room temperature and impregnate them for 12h by equal-volume impregnation, then filter and wash them with 500mL of deionized water three times, and dry at 120°C for 12h to obtain activated alumina.

[0044] Take 10g of activated alumina and place it in a high-pressure reactor, raise the system pressure to 2.5MPa, feed 100mL / min ammonia gas, start the temperature control program to control the reactor temperature at 50°C, keep the temperature for 4h, and obtain modified trioxide after cooling aluminum.

[0045] 2. Preparation of alumina-based palladium catalyst

[0046] Take 4mL of dilute nitric acid solution containing 0.2467g of palladium chloride, impregnate it with modified alumina at room temperature for 4 hours, dry at 120°C for 12 hours, and roast at 400°C in air atmosphere for 4 hours, and obtain palladium catalyst supported on alumina after cooling .

[0047] 3. A...

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PUM

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Abstract

The invention relates to preparation and application of a dimethyl carbonate catalyst, and belongs to the technical field of catalyst preparation. According to the present invention, the alumina carrier is modified, the highly-dispersed nanometer palladium loaded on the surface of the carrier is prepared through the room temperature impregnation method so as to obtain the catalyst with excellent performance, the catalyst is used for carbonylation synthesis of dimethyl carbonate from carbon monoxide and methyl nitrite; the conversion rate of methyl nitrite achieves more than or equal to 60% andthe selectivity of dimethyl carbonate is higher than 80%, so that the alumina-based palladium catalyst prepared by the method is a catalyst with excellent conversion rate and selectivity.

Description

technical field [0001] The invention relates to the preparation and application of a dimethyl carbonate catalyst, belonging to the technical field of catalyst preparation. Background technique [0002] At present, dimethyl carbonate is an important organic chemical raw material with low toxicity, safe use and less pollution. At present, the methods for producing dimethyl carbonate at home and abroad mainly include three production methods: phosgene method, methanol liquid phase / gas phase oxidative carbonylation method, and transesterification synthesis method. The gas-phase oxidative carbonylation of methanol has developed rapidly and has a large scale of industrialization. The gas phase method was successfully developed by Dow Chemical Company of the United States in 1986, and this technology is also available in Yube, Japan. [0003] At present, the catalysts used in the gas-phase methanol oxidative carbonylation method all use alumina as a carrier to support nano-pallad...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J37/02C07C68/00C07C69/96
CPCB01J23/44B01J37/0201C07C68/00B01J35/40C07C69/96Y02P20/141
Inventor 于克生杨孝智耿光娟邢周昊贺婷婷胡晓鸣梁鹏孙朝辉王斌
Owner JIANGSU JINJU ALLOY MATERIAL
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