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Nano-granular copper-manganese compound catalyst, preparation thereof and application of nano-granular copper-manganese compound catalyst in electro-catalytic synthesis of urea

A nanoparticle and composite technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high price of elements, unfavorable widespread use, complex catalyst synthesis steps, etc., and achieve superior performance , The preparation process is simple and fast, and the effect of good Faraday efficiency

Active Publication Date: 2022-07-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the research on electrocatalytic synthesis of urea, there are still the following problems: (1) The synthesis steps of the catalyst are complicated; (2) The elements used in the catalyst are expensive, which is not conducive to widespread use; (3) The yield and selectivity of the electrocatalytic synthesis of urea are relatively low. Low

Method used

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  • Nano-granular copper-manganese compound catalyst, preparation thereof and application of nano-granular copper-manganese compound catalyst in electro-catalytic synthesis of urea
  • Nano-granular copper-manganese compound catalyst, preparation thereof and application of nano-granular copper-manganese compound catalyst in electro-catalytic synthesis of urea
  • Nano-granular copper-manganese compound catalyst, preparation thereof and application of nano-granular copper-manganese compound catalyst in electro-catalytic synthesis of urea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: a kind of copper-manganese composite Cu 2 Mn 2 O x The preparation method, the specific steps are as follows:

[0046] (1) Add 1g copper sulfate pentahydrate (0.04M) and 0.676g manganese sulfate monohydrate (0.04M) to 100mL deionized water, stir and dissolve in a heating stirring plate at 70°C and 300r / min to form a clear solution;

[0047] (2) 1M NaOH was added dropwise to the clear solution obtained in step (1), while keeping the solution at 70°C and a heating and stirring plate of 300 r / min. It can be seen that with the addition of NaOH, a precipitate and solution were formed in the cup. For the solid-liquid mixture, when the pH of the solution reaches about 8 to 9 as detected by pH test paper, the addition of NaOH is stopped, and then the mixture is aged for 6 hours on a heating and stirring plate at 70 °C and 300 r / min;

[0048](3) Washing the aged mixture in step (2) repeatedly with deionized water, and suction filtration until the pH test paper s...

Embodiment 2

[0078] Embodiment 2: A kind of copper-manganese composite Cu 1 Mn 3 O x The preparation method, the specific steps are as follows:

[0079] (1) Add 0.5g copper sulfate pentahydrate (0.02M) and 1.014g manganese sulfate monohydrate (0.06M) to 100mL deionized water, stir and dissolve in a heating stirring plate at 70°C and 300r / min to form a clear solution ;

[0080] (2) 1M NaOH was added dropwise to the clear solution obtained in step (1), while keeping the solution at 70°C and a heating and stirring plate of 300 r / min. It can be seen that with the addition of NaOH, a precipitate and solution were formed in the cup. For the solid-liquid mixture, when the pH of the solution reaches about 8 to 9 as detected by pH test paper, the addition of NaOH is stopped, and then the mixture is aged for 6 hours on a heating and stirring plate at 70 °C and 300 r / min;

[0081] (3) Washing the aged mixture in step (2) repeatedly with deionized water, and suction filtration until the pH test pa...

Embodiment 3

[0088] Embodiment 3: a kind of copper-manganese composite Cu 3 Mn 1 O x The preparation method, the specific steps are as follows:

[0089] (1) Add 1.5g copper sulfate pentahydrate (0.06M) and 0.338g manganese sulfate monohydrate (0.02M) to 100mL deionized water, stir and dissolve in a heating stirring plate at 70°C and 300r / min to form a clear solution ;

[0090] (2) 1M NaOH was added dropwise to the clear solution obtained in step (1), while keeping the solution at 70°C and a heating and stirring plate of 300 r / min. It can be seen that with the addition of NaOH, a precipitate and solution were formed in the cup. For the solid-liquid mixture, when the pH of the solution reaches about 8 to 9 as detected by pH test paper, the addition of NaOH is stopped, and then the mixture is aged for 6 hours on a heating and stirring plate at 70 °C and 300 r / min;

[0091] (3) Washing the aged mixture in step (2) repeatedly with deionized water, and suction filtration until the pH test pa...

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Abstract

The invention belongs to the technical field of catalysts, and discloses a nano-granular copper-manganese compound catalyst, preparation thereof and application of the nano-granular copper-manganese compound catalyst in electro-catalytic synthesis of urea. The method comprises the following steps: 1) dissolving copper salt and manganese salt in water to obtain a mixed solution; the copper salt is a water-soluble copper salt, and the manganese salt is a water-soluble manganese salt; 2) adjusting the pH value of the mixed solution to be alkaline, heating, stirring and aging, and carrying out subsequent treatment to obtain powder; and 3) carrying out high-temperature calcination on the powder to obtain the nano granular copper-manganese compound catalyst. The method is simple, and the prepared catalyst shows excellent catalytic activity in electro-catalysis urea synthesis. The catalyst is used for electrocatalytic synthesis of urea.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and particularly relates to a nano-particle-shaped copper manganese oxide catalyst, a preparation method thereof, and an application in electrocatalytic synthesis of urea. Background technique [0002] Because of its high nitrogen content, urea is one of the important nitrogen fertilizers, and it is of great significance to develop the urea synthesis industry. At present, the synthesis of urea in industry is mainly based on N 2 and CO 2 Reaction dominates. due to N 2 In the molecule, N≡N high bond energy (940.95kJ mol -1 ), not easy to activate, the above reaction should be operated under high temperature and high pressure, and consume about 2% of the world's energy every year. In addition, the reaction also requires complex equipment and multi-cycle synthesis process to improve the conversion efficiency. Therefore, the industrial synthesis of urea mainly has the problems of high energy c...

Claims

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Application Information

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IPC IPC(8): C25B11/077C25B3/07C25B3/09C25B3/26B82Y30/00B82Y40/00
CPCC25B11/0771C25B3/07C25B3/09C25B3/26B82Y30/00B82Y40/00
Inventor 丁良鑫邹莹钱诗卉
Owner SOUTH CHINA UNIV OF TECH