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Modified supported copper-rhenium bimetallic catalyst and its preparation method and application

A bimetallic catalyst and supported technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problem of low conversion rate of reaction substrates, low selectivity of target products, and the use of Reduced lifespan, oligomerization and other problems, to achieve excellent hydrogenation activity, prolong service life, high activity effect

Active Publication Date: 2022-01-07
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is reduced in a hydrogen atmosphere at 300-350°C for 4-10 hours, and the vaporized dimethyl adipate and hydrogen are mixed and then entered into a fixed-bed reactor for reaction under certain conditions to obtain Liquid phase product of alcohol; however, reaction substrate conversion (>92%) and target product selectivity (>83%) are relatively low
In addition, the applicant found in the research that when the hydrogenation activity of the catalyst is poor, the semi-hydrogenated intermediate product of the dibasic acid methyl ester is prone to oligomerization under the acidic action of the catalyst, and the oligomers generated are attached to the surface of the catalyst and causing a significant decrease in its service life

Method used

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  • Modified supported copper-rhenium bimetallic catalyst and its preparation method and application
  • Modified supported copper-rhenium bimetallic catalyst and its preparation method and application
  • Modified supported copper-rhenium bimetallic catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1) Preparation of supported copper-rhenium bimetallic catalyst

[0054] Dissolve 135.41g of copper nitrate, 77.73g of perrhenic acid, 5.41g of chloroplatinic acid, and 5.51g of magnesium nitrate in 2kg of deionized water to prepare a mixed saline solution, and disperse 300g of activated carbon powder evenly in the above mixed saline solution to prepare slurry A;

[0055] Dissolve sodium carbonate in water to form a 20wt% sodium carbonate solution, which is the alkaline precipitant B, heat the slurry A and the alkaline precipitant B to 60°C, and slowly add the alkaline precipitant B to the slurry A During the precipitation process, the reaction temperature was controlled at 60°C, and the pH of the system was 7.5; after all the alkaline precipitant B was added dropwise, the slurry was obtained after aging at 70°C for 3 hours;

[0056] The slurry was filtered, washed with deionized water, dried at 110°C for 12h, and roasted at 350°C for 3h, crushed and pressed into a 5*5m...

Embodiment 2

[0062] 1) Preparation of supported copper-rhenium bimetallic catalyst

[0063] Dissolve 173g of copper nitrate, 57.93g of perrhenic acid, 58.26g of cobalt nitrate, and 8.78g of calcium nitrate in 2kg of deionized water to prepare a mixed saline solution, and disperse 300g of carbon nanotube powder evenly in the above mixed saline solution to prepare slurry A;

[0064] Dissolving sodium bicarbonate in water to form a 20wt% sodium bicarbonate solution is the alkaline precipitant B, respectively heating the slurry A and the alkaline precipitant B to 70°C, and slowly adding the alkaline precipitant B to In the slurry A, control the reaction temperature of the precipitation process to 70°C, and the pH of the system to be 7.0; after the alkaline precipitant B is completely added dropwise, the slurry is obtained after aging at 70°C for 3 hours;

[0065] The slurry was filtered, washed with deionized water, dried at 100°C for 12h, and roasted at 290°C for 3h, crushed and pressed into...

Embodiment 3

[0071] 1) Preparation of supported copper-rhenium bimetallic catalyst

[0072] Dissolve 200.53g of copper chloride, 35.06g of ammonium perrhenate, 24.38g of ferric chloride, and 10.23g of barium nitrate in 2kg of deionized water to prepare a mixed saline solution, and disperse 300g of silicon carbide powder evenly in the above mixed saline solution , prepared into slurry A;

[0073] Dissolve ammonium bicarbonate in water to form a 20wt% ammonium bicarbonate solution, which is the alkaline precipitant B. Heat the slurry A and alkaline precipitant B to 60°C respectively, and slowly add the lye B to the slurry A During the precipitation process, the reaction temperature was controlled at 60°C and the pH of the system was 8.0; after all the sodium carbonate solution was added dropwise, the slurry was obtained after aging at 70°C for 3 hours;

[0074] The slurry was then filtered, washed with deionized water, dried at 120°C for 8h, and roasted at 450°C for 5h, crushed and pressed ...

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Abstract

The invention discloses a supported copper-rhenium bimetallic catalyst. The catalyst comprises an active body, an active auxiliary agent, an alkali auxiliary agent and a carrier; the chemical composition of the active main body is Cu x Re (1‑x) O, wherein x is 0.7-0.9. The invention provides a preparation method of a catalyst, comprising: (1) dissolving a copper-containing compound, a rhenium-containing compound, a coagent precursor and a base auxiliary precursor in water, configuring a mixed salt solution, and dispersing the carrier in the mixing Obtain a slurry in a saline solution; (2) drop an alkaline precipitant into the slurry and adjust its pH value to 7-9, age to obtain a slurry, and control the temperature to 60-90°C during the dropping process; (3) The slurry is post-treated to obtain a supported copper-rhenium bimetallic catalyst. The invention provides a preparation method and application of a modified supported copper-rhenium bimetallic catalyst. The modified supported copper-rhenium bimetallic catalyst provided by the invention has higher reactivity and glycol selectivity.

Description

technical field [0001] The invention belongs to the technical field of catalytic hydrogenation, and in particular relates to a catalyst for hydrogenating dibasic acid dimethyl to dibasic alcohol, a preparation method and application thereof. Background technique [0002] Mixed dibasic acid is the main by-product of the production of adipic acid, the raw material of nylon 66. How to effectively use its methylated product, mixed dibasic acid dimethyl ester, is a problem faced by all domestic adipic acid enterprises. Dimethyl dibasic acid can be converted into mixed dibasic alcohol by means of catalytic hydrogenation. It is an important organic chemical raw material and can be used to synthesize superfiber polyester fiber, high-end automotive interior, high-grade leather clothing, luggage fabrics, etc. Its future development prospects are very broad. The product can also be used in the production of resins, synthetic plasticizers, etc. In addition, high value-added chemicals ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/89C07C29/149C07C31/20
Inventor 靳少华王明永胡江林刘运海杨洋陈永王磊黎源
Owner WANHUA CHEM GRP CO LTD
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