Bimetal MOF (Metal Organic Framework) derived catalyst as well as preparation method and application thereof

A catalyst, bimetallic technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of difficult formation of active sites, few exposed active sites, poor catalytic stability, etc., and achieve high yield, excellent performance, secondary less reactive effect

Active Publication Date: 2022-03-25
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this application is to provide a bimetallic MOF-derived catalyst and its preparation method and application, aiming to solve the problem of low catalytic activity, insufficient electrical conductivity, less exposed active sites, difficult formation of active sites and catalytic The problem of poor stability

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  • Bimetal MOF (Metal Organic Framework) derived catalyst as well as preparation method and application thereof
  • Bimetal MOF (Metal Organic Framework) derived catalyst as well as preparation method and application thereof
  • Bimetal MOF (Metal Organic Framework) derived catalyst as well as preparation method and application thereof

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preparation example Construction

[0052] In the second aspect, the embodiment of the present application provides a method for preparing a bimetallic MOF-derived catalyst, comprising the following steps:

[0053] S1: The first intermediate is obtained by modifying the bimetallic MOF and the non-ionic polymer compound in an organic solvent;

[0054] S2: Mixing and reacting the first intermediate with a soluble zinc salt and a nitrogen-containing ligand in an organic solvent to obtain a second intermediate;

[0055] S3: carbonizing the second intermediate to obtain a third intermediate;

[0056] S4: Mixing the third intermediate with a fluorinating agent for fluorination treatment to obtain a catalyst.

[0057] In the preparation method of the bimetallic MOF-derived catalyst provided in the second aspect of the embodiment of the present application, the nitrogen-doped carbon nanotubes attached to the surface of the synthesized catalyst are loose and not dense, which helps to expose the metal catalytic active ce...

Embodiment 1

[0082] Preparation of FeNi@NCNT-F electrooxidation oxygen generation catalyst:

[0083] In the first step, add 905mg of ferric chloride, 480mg of nickel nitrate and 831mg of terephthalic acid into 50mL of N,N-dimethylformamide solution in turn, then add 20mL of 0.2M NaOH solution, stir at room temperature until mixed uniform. The above solution was transferred to a Teflon substrate with a volume of 100mL, and the temperature of the oven was set at 100°C, and the holding time was 15h. After the reaction was completed and cooled to room temperature, it was washed with deionized water and ethanol several times, centrifuged, and vacuum-dried to obtain a yellow powder, which was tested by a powder XRD diffractometer to obtain FeNi MIL MOF, which was used in the next experiment.

[0084] In the second step, 800 mg of the synthesized FeNi MIL MOF was taken at room temperature, and 4 g of polyvinylpyrrolidone was dissolved in 80 mL of methanol solution and stirred for 15 h.

[0085]...

Embodiment 2

[0092] Preparation of FeNi@NCNT-F-1-6 electrooxidation catalyst:

[0093] The preparation process of this example is the same as that of Example 1, the difference being that the molar ratio of zinc nitrate to 2-methylimidazole is 1:6; specifically in the second step, the preparation of solution C is 48 mmol of 2-methylimidazole solution Obtain solution C in 100mL methanol solution, mix solutions A, B, and C for 5 minutes and then let it stand for 24 hours. The molar ratio of zinc nitrate to 2-methylimidazole is 1:6.

[0094] Figure 6 It is the SEM image of FeNi MIL@ZIF 8-1-6MOF prepared in Example 2. It can be seen that the particles of ZIF 8 are relatively large and cover the surface of FeNi MIL MOF. Figure 7 and Figure 8 It is the SEM image and XRD image of FeNi@NCNT-F-1-6 after carbonization and fluorination, the ZIF 8 covered on the surface is converted into CNT, but agglomeration can still be observed. FeNi MIL@ZIF 8-1-6MOF in N 2 After carbonization pyrolysis and ...

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Abstract

The invention belongs to the technical field of catalyst preparation, and particularly relates to a bimetallic MOF (Metal Organic Framework)-derived catalyst as well as a preparation method and application of the bimetallic MOF-derived catalyst. Comprising nano-alloy matrixes based on a bimetallic MOF structure, nitrogen-doped carbon nanotubes attached to the surfaces of the nano-alloy matrixes and metal fluoride dispersed between the nano-alloy matrixes. The loose nitrogen-doped carbon nanotubes are attached to the surface of the catalyst provided by the invention, the conductivity of the catalyst is greatly improved, the polarity of the catalyst is improved by the metal fluoride dispersed in the nano-alloy matrix, active sites are exposed to the maximum extent, the nano-alloy matrix and the nitrogen-doped carbon nanotubes are compounded to form a porous frame structure, and the performance of the catalyst is improved. The catalyst is simple in structure and stable in structure, metal nanoparticles can be prevented from being agglomerated, full contact with electrolyte is achieved, and the catalytic activity of the catalyst is greatly improved.

Description

technical field [0001] The application belongs to the technical field of catalyst preparation, and in particular relates to a bimetallic MOF-derived catalyst and its preparation method and application. Background technique [0002] Green electrolyzed water is a promising electrolytic hydrogen production technology, which can efficiently convert electrical energy into chemical energy. It includes two upper electrode reactions, that is, the hydrogen evolution reaction at the cathode and the oxygen evolution reaction at the anode, but the oxygen generation reaction at the anode is more complicated, the overpotential is high, and a large amount of electric energy will be consumed. The noble metal iridium and ruthenium oxides currently used have problems such as high cost and few resources, which limit their large-scale application and are difficult to apply in the field of hydrogen energy economy in the future. Therefore, promoting green electrolysis technology requires the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/091
CPCC25B1/04C25B11/091Y02E60/36
Inventor 王新中冯立纲胡广志
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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