Magnetic graphene-loaded palladium nano-composite catalyst and preparation method thereof

A composite catalyst, magnetic graphene technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as restricting practical applications, difficult separation and recovery, poor filtration and centrifugation effects, etc. Achieving good magnetic effect, easy separation and low price

Inactive Publication Date: 2015-12-16
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual catalytic reaction system, due to the poor filtration and centrifugation effect due to the physical and chemical properties of the graphene material itself, the reported graphene / noble metal nanocomposite catalysts still have the problem of being difficult to separate and recycle, which seriously restricts their use. practical application

Method used

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  • Magnetic graphene-loaded palladium nano-composite catalyst and preparation method thereof
  • Magnetic graphene-loaded palladium nano-composite catalyst and preparation method thereof
  • Magnetic graphene-loaded palladium nano-composite catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The preparation method of graphene oxide:

[0028] Cool 200mL of concentrated sulfuric acid to 0°C, add 10g of graphite powder and 6g of sodium nitrate, slowly add 40g of potassium permanganate under stirring, keep the system temperature not exceeding 20°C, stir well and put it in a water bath at 35°C After reacting for 120 minutes, add 1000 mL of deionized water to keep the temperature of the system not exceeding 98°C, and continue stirring for 30 minutes; add 600 mL of deionized water and 50 mL of 30% H 2 o 2 , filtered, with 1mol·L -1 Wash the filter cake with HCl until SO4 cannot be detected in the filtrate 2- , and then washed with deionized water to become neutral, centrifuged, and vacuum-dried to obtain black graphene oxide powder.

[0029] Preparation of nickel ferrite graphene supported palladium nanocomposite catalyst:

[0030] Add 0.1g of graphene oxide to 100mL of deionized water, ultrasonically disperse for 2h, and add to a mixture of 0.5g of nickel chl...

Embodiment 2

[0035] Add 0.2g of graphene oxide to 200mL of deionized water, ultrasonically disperse for 2h, and add to a solution consisting of 1.2g of nickel bromide trihydrate, 3.6g of iron nitrate nonahydrate and 200mL of polyethylene glycol / deionized water , the mixed solution was stirred for 2 h, and then sodium hydroxide solution was slowly added dropwise to adjust the pH value of the solution reaction system to 10, the mixed solution was transferred to a hydrothermal reactor, and then heated to 150° C. and maintained for 10 h. The reaction was naturally cooled to room temperature, the reaction product was filtered, rinsed with deionized water and ethanol to obtain nickel ferrite graphene oxide (NiFe 2 o 4 GO) complex. Add this complex to 200mL of deionized water, ultrasonically disperse for 2h, add 0.3g of palladium chloride, then add 0.05g of sodium borohydride, transfer the mixed solution to a hydrothermal reaction kettle, then heat to 120°C and keep After 4 hours, the reaction ...

Embodiment 3

[0037] Add 0.3g graphene oxide to 400mL deionized water, ultrasonically disperse for 2h, add 2.1g nickel sulfate hexahydrate, 7.0g ferric sulfate and 200mL polyethylene glycol / deionized water solution, mix the solution After stirring for 2 h, ammonia water was slowly added dropwise to adjust the pH value of the reaction system to 11, and the mixed solution was transferred to a hydrothermal reactor, and then heated to 180° C. and maintained for 10 h. The reaction was naturally cooled to room temperature, the reaction product was filtered, rinsed with deionized water and ethanol to obtain nickel ferrite graphene oxide (NiFe 2 o 4 GO) complex. Add this complex to 200mL of deionized water, ultrasonically disperse for 2 hours, add 0.4g of bistriphenylphosphine palladium dichloride, then add 0.1g of sodium borohydride, transfer the mixed solution to a hydrothermal reaction kettle, and then Heating to 150° C. and maintaining for 4 hours, cooling naturally to room temperature after ...

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Abstract

The invention provides a magnetic graphene-loaded palladium nano-composite catalyst and a preparation method thereof. Graphene is loaded with palladium nano-particles while formed through hydrothermal reduction of magnetic graphene oxide, the magnetic graphene loaded palladium nano-composite catalyst is prepared, and the catalyst comprises nickel ferrite loaded graphene carriers and palladium nano active ingredients. The palladium nano-particles of the composite catalyst prepared with the method are evenly distributed, the magnetic effect is higher, and the composite catalyst can be recovered quickly through magnetic separation.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, in particular to a method for preparing a magnetic graphene-loaded palladium nanocomposite catalyst. Background technique [0002] As an important part of nanomaterials, nano-noble metal catalysts organically combine the unique physical and chemical properties of noble metals with the special properties of nanomaterials, which is of great significance for improving the rate and conversion rate of chemical reactions. Among the many noble metal nanocatalysts, palladium nanocatalysts are widely used in basic research and industrialization, involving various chemical reactions such as hydrogenation, reduction, oxidation and coupling. Although palladium nanocatalysts have high activity, they pose the problem of being difficult to separate and recycle from the reaction system, which largely limits their large-scale industrial application in organic reactions. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/00
Inventor 赵晓华刘想
Owner JIANGSU UNIV
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