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High-dispersion Co-based bimetallic catalyst based on ZIFs and preparation method thereof

A bimetallic catalyst, highly dispersed technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low metal utilization

Pending Publication Date: 2021-06-18
HUANENG CLEAN ENERGY RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese invention patent with application number 201911417367.2 discloses a preparation method of a supported Fe-Co / ZIF-67 bimetallic catalyst, which uses ZIF-67 as a template to load iron and cobalt in the form of co-precipitation. On ZIF-67, a magnetic Fe-Co / ZIF-67 bimetallic catalyst is obtained by calcination, the mass fraction of Fe and Co is between 5-15%, the metal particles are in the nanometer scale, and there is a problem of low metal utilization

Method used

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  • High-dispersion Co-based bimetallic catalyst based on ZIFs and preparation method thereof
  • High-dispersion Co-based bimetallic catalyst based on ZIFs and preparation method thereof
  • High-dispersion Co-based bimetallic catalyst based on ZIFs and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of highly dispersed CoNi bimetallic catalyst based on ZIFs specifically comprises the following steps:

[0040] Step 1) 5.357g (297.49g / mol, 18mmol) Zn(NO 3 ) 2 ·6H 2 O and 0.218g (291.03g / mol, 0.75mmol) Co(NO 3 ) 2 ·6H 2 O was dissolved in 150mL of methanol, and a metal salt methanol solution was formed after ultrasonication for 10min; 6.160g (82.1g / mol, 75mmol) of 2-methylimidazole was dissolved in 150mL of methanol, and a 2-methylimidazole methanol solution was formed by ultrasonication for 10min; Quickly pour the salt methanol solution into the 2-methylimidazole methanol solution, sonicate for 10 minutes and place it in a 35°C incubator for 12 hours; then centrifuge the above mixed solution, wash the precipitate with methanol for 3 times, and then place it in a vacuum oven at 60°C Drying in medium for 8h, the ZnCo-ZIFs precursor was obtained.

[0041] Step 2) The ZnCo-ZIFs precursor obtained in 1) is subjected to vacuum degassing t...

Embodiment 2

[0049] A highly dispersed CoRh bimetallic catalyst based on ZIFs and a preparation method thereof, specifically comprising the following steps:

[0050] Step 1) 5.357g (297.49g / mol, 18mmol) Zn(NO 3 ) 2 ·6H 2 O and 0.218g (291.03g / mol, 0.75mmol) Co(NO 3 ) 2 ·6H 2 O was dissolved in 150mL of methanol, and a metal salt methanol solution was formed after ultrasonication for 10min; 6.160g (82.1g / mol, 75mmol) of 2-methylimidazole was dissolved in 150mL of methanol, and a 2-methylimidazole methanol solution was formed by ultrasonication for 10min; Quickly pour the salt methanol solution into the 2-methylimidazole methanol solution, put it in a 50°C incubator for 6 hours after ultrasonication for 10min; Drying in medium for 12h, the ZnCo-ZIFs precursor was obtained.

[0051] Step 2) performing vacuum degassing treatment on the ZnCo-ZIFs precursor obtained in step 1) to remove impurities in the precursor. First place the ZnCo-ZIFs precursor in a U-shaped tube, and then install i...

Embodiment 3

[0059] A highly dispersed CoFe bimetallic catalyst based on ZIFs and a preparation method thereof, specifically comprising the following steps:

[0060]Step 1) 7.902g (219.51g / mol, 36mmol) Zn(OAc) 2 2H 2 O and 0.187g (249.08g / mol, 0.75mmol) Co(OAc) 2 4H 2 O was dissolved in 150mL methanol, and a metal salt methanol solution was formed after ultrasonication for 10min; 12.315g (82.1g / mol, 150mmol) 2-methylimidazole was dissolved in 150mL methanol, and ultrasonication was performed for 15min to form a 2-methylimidazole methanol solution; Quickly pour the salt methanol solution into the 2-methylimidazole methanol solution, put it in a 30°C incubator for 12 hours after ultrasonication for 15 minutes; then centrifuge the above mixed solution, wash the precipitate with methanol for 3 times, and then place it in a vacuum oven at 50°C Drying in medium temperature for 10h, the ZnCo-ZIFs precursor was obtained.

[0061] Step 2) The ZnCo-ZIFs precursor obtained in 1) is subjected to v...

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Abstract

The invention discloses a high-dispersion Co-based bimetallic catalyst based on ZIFs and a preparation method of the high-dispersion Co-based bimetallic catalyst based on ZIFs, and belongs to the technical field of synthesis of nanometer materials and catalysts, the method ingeniously utilizes the characteristics that metal nodes in ZnCo-ZIFs are high in dispersion and have periodic pore structures; first, a second active metal salt is introduced into ZIFs pore channels through a double-solvent method; then in the high-temperature calcination process, the low-boiling-point metal Zn volatilizes and plays a fence role, the distance between the active metals is increased, Co nodes and the second active metal are subjected to in-situ reduction, and the high-dispersion Co-based bimetallic catalyst loaded on the nitrogen-doped carbon carrier is obtained. The method is simple in process and convenient to operate, the composition of the obtained high-dispersion Co-based bimetallic catalyst is flexible and adjustable, metal particles are distributed in a high-dispersion form, and the high-dispersion Co-based bimetallic catalyst has good stability and is expected to be applied to hydrogenation reaction, synthesis gas conversion, alcohol selective oxidation and other reactions.

Description

technical field [0001] The invention belongs to the technical field of nanometer material and catalyst synthesis, and relates to a highly dispersed Co-based bimetallic catalyst based on ZIFs and a preparation method thereof. Background technique [0002] Zeolitic imidazolate frameworks (Zeolitic imidazolate frameworks, ZIFs) materials are a subspecies of metal-organic frameworks (Metal organic frameworks, MOFs) materials, composed of metal ions with a tetrahedral coordination configuration (such as Zn 2+ 、Co 2+ ) coordinated with imidazole-based organic ligands, including Zn-based ZIF-8, Co-based ZIF-67, etc. ZIFs materials have a typical zeolite-like periodic topology, large specific surface area, high thermal stability and easy preparation, and have a wide range of applications in the fields of gas storage and separation, sensing, catalysis and membrane science. [0003] The Chinese invention patent with application number 201510168261.9 discloses a ZIF-8-based hydrogena...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08
CPCB01J27/24B01J37/086B01J35/399B01J35/23B01J35/635Y02P20/52
Inventor 王焕君郭东方范金航汪世清刘练波郜时旺
Owner HUANENG CLEAN ENERGY RES INST
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