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Catalyst for synthesizing dimethyl carbonate by catalytic coupling of carbon monoxide as well as preparation method and application thereof

A technology of dimethyl carbonate and carbon monoxide, which is applied in the preparation of carbonate/haloformate, preparation of organic compounds, catalyst activation/preparation, etc., can solve problems such as poor stability and inability to maintain high activity for a long time , to achieve the effects of stable reaction performance, improved electron transfer performance, high and low temperature activity

Active Publication Date: 2020-07-17
SHANGHAI HUAYI ENERGY CHEM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention aims at the shortcomings of catalysts in the prior art that cannot maintain high activity for a long time and has poor stability, and provides a catalyst with excellent performance for carbon monoxide catalytic coupling to synthesize dimethyl carbonate and its preparation method and application. The catalyst includes a modified composite oxide carrier, the modified composite oxide carrier is γ-alumina modified with VIB group elements, which improves the electron transfer performance between the auxiliary agent and the active component, and the catalyst is aided by step-by-step impregnation. agent and active components, optimize the dispersion and distribution state of the active components in the modified composite oxide carrier, the catalyst has high low-temperature activity, selectivity and space-time yield, and the reaction performance is stable, and can be carried out for a long time running of time

Method used

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  • Catalyst for synthesizing dimethyl carbonate by catalytic coupling of carbon monoxide as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Weigh 1.35g of ammonium metatungstate and dissolve it in 83.65g of deionized water, and dissolve 100g of γ-Al 2 o 3 The carrier was added into the above solution and immersed for 60 minutes until the solution was completely absorbed by the carrier, then ultrasonically dried at 85°C for 4 hours, and calcined in a muffle furnace at 800°C for 2 hours to obtain a composite oxide carrier; weigh 1.34g of chlorine dihydrate Copper chloride was dissolved in 83.66g of deionized water, and the composite oxide carrier prepared above was immersed in the prepared copper chloride solution for 60 minutes until the solution was completely absorbed by the carrier, then ultrasonically dried at 85°C for 4 hours, and then dried at 400°C for 4 hours. Roast in a furnace for 4 hours; then weigh 0.835g of palladium chloride solid, dissolve it in 83g of aqueous solution containing hydrochloric acid, control the pH value of the solution to 1.2 to 1.3, and immerse the above-mentioned roasted samp...

Embodiment 2

[0054] Weigh 2.70g of ammonium metatungstate and dissolve it in 82.3g of deionized water, and dissolve 100g of γ-Al 2 o 3 The carrier was added into the above solution and immersed for 60 minutes until the solution was completely absorbed by the carrier, then ultrasonically dried at 85°C for 4 hours, and then roasted in a muffle furnace at 500°C for 6 hours to obtain a composite oxide carrier; weigh 5.36g of chlorine dihydrate Copper chloride was dissolved in 79.64g of deionized water, and the composite oxide carrier prepared above was immersed in the prepared copper chloride solution for 60 minutes until the solution was completely absorbed by the carrier, then ultrasonically dried at 85°C for 4 hours, and then dried at 300°C for 4 hours. Roast in a furnace for 6h; then weigh 1.67g of palladium chloride solid, dissolve it in 83.33g of hydrochloric acid-containing aqueous solution, control the pH value of the solution to 2.0, and immerse the above-mentioned roasted sample in t...

Embodiment 3

[0056] Weigh 2.7g of ammonium metatungstate and dissolve it in 82.3g of deionized water, and dissolve 100g of γ-Al 2 o 3 The carrier was added into the above solution and soaked for 60 minutes until the solution was completely absorbed by the carrier, then ultrasonically dried at 85°C for 4 hours, and calcined in a muffle furnace at 500°C for 6 hours to obtain a composite oxide carrier; weigh 7.24g of anhydrous Ferric chloride and 2.87g of potassium chloride were dissolved in 74.89g of deionized water, and the composite oxide carrier prepared above was immersed in the prepared auxiliary salt solution for 60 minutes until the solution was completely absorbed by the carrier, and then placed at 85°C Ultrasonic drying for 4 hours, roasting in a muffle furnace at 400°C for 3 hours; then weigh 2.5g of palladium chloride solid, dissolve it in 82.5g of aqueous solution containing hydrochloric acid, control the pH of the solution to 1.0, and immerse the above-mentioned roasted sample i...

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Abstract

The invention provides a catalyst for synthesizing dimethyl carbonate through catalytic coupling of carbon monoxide as well as a preparation method and application thereof. The catalyst comprises a modified composite oxide carrier, a metal palladium active component and a transition metal additive, wherein the modified composite oxide carrier is VIB group element modified gamma-aluminum oxide, themetal palladium element in the metal palladium active component accounts for 0.3-1.5% of the weight of the gamma-aluminum oxide, and the transition metal element in the transition metal additive accounts for 0.5-3.5% of the weight of the gamma-aluminum oxide. The catalyst disclosed by the invention can be applied to gas-phase synthesis of dimethyl carbonate from CO and methyl nitrite under low-temperature and low-pressure conditions, has relatively high low-temperature activity, selectivity and space-time yield, is stable in reaction performance, and can operate for a relatively long time.

Description

technical field [0001] The invention relates to a catalyst for gas-phase catalytic synthesis of dimethyl carbonate from carbon monoxide, a preparation method and application thereof, and belongs to the field of catalyst preparation. Background technique [0002] Dimethyl carbonate (Dimethyl carbonate) is abbreviated as DMC. It is a colorless and transparent liquid under normal temperature and pressure. It has a slight fragrance and is insoluble in water. Dimethyl carbonate is a "green" chemical raw material with non-toxic, excellent environmental performance and great development prospects. It is known as an important and broad-spectrum green chemical in the 21st century. It is widely used in medicine, pesticides, solvents and Gasoline additives and other fields. At present, the industrial methods for synthesizing dimethyl carbonate mainly include phosgene method and transesterification method. The phosgene method is a traditional synthesis method, which uses highly toxic ...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/68B01J37/02C07C68/00C07C69/96
CPCB01J23/8993B01J23/686B01J37/0205C07C68/00C07C69/96
Inventor 杨菊群朱燕王志光吴良泉
Owner SHANGHAI HUAYI ENERGY CHEM
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