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Preparation method of supported palladium-carbon catalyst

A technology of carbon catalyst and supported palladium, which is applied in the field of preparation of supported palladium-carbon catalyst, can solve the problems of poor catalyst active phase dispersion and large particle size, and achieve the effect of improving catalytic activity and stability and preventing agglomeration and growth

Inactive Publication Date: 2015-10-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst active phase prepared by this method has poor dispersibility and large particle size

Method used

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  • Preparation method of supported palladium-carbon catalyst
  • Preparation method of supported palladium-carbon catalyst
  • Preparation method of supported palladium-carbon catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of supported palladium carbon catalyst, such as figure 1 Shown:

[0036] (1) Preparation of palladium nanoparticles: Add polyvinylpyrrolidone and 275 mg of citric acid into 8 mL of water, stir and reflux at 90° C. in a three-necked flask. Then 3 mL of sodium chloropalladate solution with a concentration of 7.3 mM was added, and the reaction was continued for about 26 h.

[0037] (2) Preparation of silica spheres: Add 6 mL of ethyl orthosilicate to a mixed solution consisting of 74 mL of ethanol, 10 mL of water and 3.15 mL of ammonia water, and continuously stir at room temperature for 12 h. The obtained solid was washed three times with water and ethanol respectively, and finally dried at 100°C.

[0038] (3) Preparation of amino-modified silica spheres: Add 0.5 g of silica spheres into a mixed solution containing 90 mL of isopropanol and 0.75 mL of 3-aminopropyltriethoxysilane, and reflux at 80° C. for 2 h. The resulting solid was washed twice wi...

Embodiment 2

[0045] A palladium carbon catalyst with a Pd loading of 1% was prepared in the same manner as in Example 1, and the catalyst number was Pd / NC-2. The volume of the solution containing amino-modified silica spheres used was 4.8 mL, and the volume of the solution containing Pd nanoparticles was 28 mL.

Embodiment 3

[0047] A palladium carbon catalyst with a Pd loading of 0.5% was prepared in the same manner as in Example 1, and the catalyst number was Pd / NC-3. The volume of the solution containing amino-modified silica spheres used was 4.8 mL, and the volume of the solution containing Pd nanoparticles was 14 mL.

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Abstract

The present invention discloses a preparation method of a supported palladium-carbon catalyst. The preparation method is characterized by comprising the following steps of: firstly, dispersing silicon dioxide spheres modified by an amnio functional group into water; adding a water solution containing noble metal palladium nano particles; adsorbing the palladium nano particles on the surface of silicon dioxide under an ultrasonic condition to form a palladium / silicon dioxide compound sphere; then adding dopamine to form a poly-dopamine shell layer on the surface of the palladium / silicon dioxide compound sphere under an alkaline condition; carbonizing poly-dopamine at a high temperature under an inert atmosphere and embedding the palladium nano particles into a carbon shell layer in the process; and finally, removing the silicon dioxide spheres with an alkaline solution to prepare the palladium-carbon catalyst. The catalyst prepared by the invention has a high catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of synthesis of supported noble metal catalysts, and in particular relates to a preparation method of supported palladium-carbon catalysts. Background technique [0002] Supported noble metal catalysts have excellent catalytic performance and have been widely used in various industries such as petrochemical, pharmaceutical, environmental protection, and pesticides. The supported palladium catalyst with excellent catalytic performance should have the following characteristics in structure: 1) the particle size of palladium nanoparticles should be in the nanometer scale, and there are many active sites exposed on the surface; 2) the specific surface area of ​​the catalyst carrier is large, and the active components It has good dispersibility on the surface of the carrier; 3) There is a strong interaction between the palladium nanoparticles and the catalyst carrier, so as to avoid the migration and agglomeratio...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 边绍伟刘思
Owner DONGHUA UNIV
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