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Catalyst for catalytically oxidizing furfural for preparing maleic acid, method for preparing catalyst and application thereof

A catalytic oxidation and catalyst technology, which is applied in the direction of oxidative preparation of carboxylic acid, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of low conversion rate of raw materials, low yield of products, harsh reaction conditions, etc. , to achieve the effects of sustainable development, less side reactions, and high yield of maleic acid

Active Publication Date: 2019-03-01
合肥低碳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that fossil products are used, and the reaction conditions are very harsh, and it needs to be carried out under high temperature and pressure.
[0004] At present, the technology of using renewable carbon sources to replace fossil products to prepare maleic acid has attracted great attention at home and abroad, and has also achieved rapid development. The problem of low conversion rate of raw materials and low product yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of the catalyst that the carbon nitride of potassium bromide doping constitutes comprises the following steps:

[0028] (1) Get 10g urea and 0.5g potassium bromide, add 30g aqueous solution, stir at room temperature;

[0029] (2) After drying the stirred solution in step (1) at 80°C, grind it into powder and put it into a crucible with a lid;

[0030] (3) Put the powder in step (2) in a muffle furnace and calcinate at 550° C. for 2 hours to obtain a potassium bromide-doped carbon nitride catalyst.

[0031] The carbon nitride doped with potassium bromide obtained in this example was characterized, and the result was: the surface basicity of the carbon nitride doped with potassium bromide was 1.61 mmol / g.

Embodiment 2

[0033] The preparation of the catalyst formed by the carbon nitride doped with potassium chloride comprises the following steps:

[0034] (1) Get 10g urea and 0.5g potassium chloride, add 30g aqueous solution, stir at room temperature;

[0035] (2) After drying the stirred solution in step (1) at 80°C, grind it into powder and put it into a crucible with a lid;

[0036] (3) Put the powder in step (2) in a muffle furnace and calcinate at 550° C. for 2 hours to obtain a potassium bromide-doped carbon nitride catalyst.

Embodiment 3

[0038] The preparation of the catalyst formed by the carbon nitride doped with potassium nitrate comprises the following steps:

[0039] (1) Get 10g urea and 0.5g potassium nitrate, add 30g aqueous solution, stir at room temperature;

[0040] (2) After drying the stirred solution in step (1) at 80°C, grind it into powder and put it into a crucible with a lid;

[0041] (3) Put the powder in step (2) in a muffle furnace and calcinate at 550° C. for 2 hours to obtain a potassium bromide-doped carbon nitride catalyst.

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PUM

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Abstract

The invention discloses a catalyst for catalytically oxidizing furfural for preparing maleic acid, and relates to the technical field of renewable energy sources. By the aid of the catalyst, the problems of harsh reaction conditions and low raw material conversion rates and maleic acid yields due to the fact that fossil products need to be used as production raw materials on the basis of existingmethods for preparing existing maleic acid can be solved. The catalyst comprises potassium salt doped carbon nitride. The invention further discloses a method for preparing the catalyst and application of the catalyst to catalytically oxidizing the furfural for preparing the maleic acid. The method for preparing the catalyst includes mixing potassium salt, precursors of carbon nitride and solventswith one another; carrying out drying and calcination to obtain the catalyst. A process for preparing the maleic acid includes a step of carrying out oxidation reaction on the furfural in solvents under the condition of the presence of the catalyst. The catalyst, the method and the application have the advantages that the furfural conversion rate can reach 99% at least when the maleic acid is prepared by the aid of the process, and the optimal maleic acid yield can reach 70.40%.

Description

technical field [0001] The invention relates to the technical field of renewable energy, in particular to a catalyst for preparing maleic acid by catalyzing furfural oxidation and its preparation method and application. Background technique [0002] As an important chemical raw material and intermediate, maleic acid is widely used in industry. The main purpose of maleic acid is to make unsaturated polyester resin, and it can also be used as a new sour agent in the food and beverage industry. Adding an appropriate amount of maleic acid can enhance the special fruit flavor and improve the taste. At present, the world needs about 1.8 million tons of it every year maleic acid. Therefore, how to efficiently prepare maleic acid, especially the use of renewable resources to prepare maleic acid, has attracted widespread attention from various countries. [0003] There are many ways to produce maleic acid, but the method used in industry is mainly to oxidize benzene with air at 450...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C51/285C07C57/145
CPCC07C51/285B01J27/24C07C57/145B01J27/25B01J27/08B01J37/086B01J37/04C07C51/16C07C51/23B01J27/10B01J37/084C07C51/31B01J23/04
Inventor 李文志杨涛
Owner 合肥低碳研究院
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