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Magnetic graphene-based platinum-nickel bimetallic catalyst and preparation method of magnetic graphene-based platinum-nickel bimetallic catalyst

A bimetallic catalyst, alkenyl platinum technology, applied in the field of catalysts, can solve problems such as difficulty in recovering nano-catalysts, and achieve the effects of simple and efficient recovery process, low cost, and mild reaction conditions

Inactive Publication Date: 2015-09-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although graphene-supported metal nanocomposites can be used as good heterogeneous catalysts, most of the supported metals are noble metals such as gold, silver, palladium, platinum, etc., and it is difficult to recover these nanocatalysts in the liquid phase reaction system.

Method used

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  • Magnetic graphene-based platinum-nickel bimetallic catalyst and preparation method of magnetic graphene-based platinum-nickel bimetallic catalyst
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  • Magnetic graphene-based platinum-nickel bimetallic catalyst and preparation method of magnetic graphene-based platinum-nickel bimetallic catalyst

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preparation example Construction

[0022] The preparation method of magnetic graphene-based platinum-nickel bimetallic catalyst of the present invention comprises the steps:

[0023] 1) In the graphene oxide aqueous solution with a concentration of 0.8-1.2 mg / mL, add tannic acid with a concentration of 3-5 mg / mL as a stabilizer at a mass ratio of graphene oxide to tannic acid of 1:1, and ultrasonically Mix and centrifuge until there is no tannic acid in the supernatant, remove the precipitate from the lower layer to obtain a graphene oxide tannic acid mixture, and prepare the obtained graphene oxide tannic acid mixture according to the mass ratio of graphene oxide and distilled water as 1:8-12 Ultrasonic dispersion in distilled water to obtain graphene oxide tannic acid composite aqueous solution;

[0024] 2) Take the graphene oxide tannic acid composite aqueous solution prepared in step 1), and add graphene oxide single Adding a platinum metal ion solution with a platinum metal ion concentration of 1 to 2 mmo...

specific example

[0028] First make graphene oxide solution:

[0029] Cool 230mL of concentrated sulfuric acid with a mass fraction of 98% to 0-5°C, add 10g of graphite and 5g of sodium nitrate, and stir for 30min at 0-5°C. Add 30g of potassium permanganate, the temperature of the reaction system should not exceed 20°C when adding, after the addition is complete, set the reaction temperature at 35°C and continue stirring for 30 minutes, add 460mL of water, raise the temperature to 98°C and continue stirring for 15 minutes, add warm water, and The mixed solution was diluted to 1400 mL, and 10 mL of 3% hydrogen peroxide was added to remove unreacted potassium permanganate. The mixed solution was filtered under reduced pressure, washed with 500mL of 1M dilute hydrochloric acid, and then washed with 1000mL of deionized water, and then centrifuged at 10000r / min to collect the precipitate and dispersed in water to prepare a graphene oxide aqueous solution.

Embodiment 1

[0031] Take 100 mL of graphene oxide aqueous solution with a concentration of 0.8 mg / mL, add 20 mL of tannic acid aqueous solution with a concentration of 4 mg / mL, ultrasonically disperse for 30 minutes, fully mix graphene oxide and tannic acid, and centrifuge to remove the lower layer of precipitate to obtain dehydration The final graphene oxide / tannic acid mixture was ultrasonically dispersed in 100 mL of distilled water. In the prepared graphene oxide / tannic acid aqueous solution, add 20mL concentration of 1mmol / L chloroplatinic acid and 33mL concentration of 12mmol / L nickel sulfate aqueous solution, dropwise add 1mol / L sodium hydroxide aqueous solution until the pH is 9 , add 2.64mL of ascorbic acid aqueous solution with a concentration of 0.3mmol / mL, stir and react at 25°C for 30min, centrifuge and wash with deionized water until the pH of the supernatant is 7, take the lower layer and freeze-dry at -50°C to obtain magnetic graphite Alkenyl platinum-nickel bimetallic cata...

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Abstract

The invention relates to a magnetic graphene-based platinum-nickel bimetallic catalyst and a preparation method of the magnetic graphene-based platinum-nickel bimetallic catalyst. Platinum-nickel alloy type bimetallic nanoparticles with the particle size being 10-20nm are loaded on a graphene carrier, the saturation magnetization of the catalyst at 15-35 DEG C is 8-13emu / g, and the bimetallic catalyst is prepared from the following ingredients by weight percent: 75-85wt% of graphene, 1.5-3.6wt% of platinum and 12.8-22.5wt% of nickel, and the sum of all percentages of all ingredients is 100%. The preparation method comprises the steps of preparing graphene oxide-tannic acid composite aqueous solution; adding nickel metallic ion solution to adjust the pH value to be 9-10, adding reducing agents and stirring for reaction, washing until the pH value of the supernatant liquid is 6.5-7, and taking precipitates at the lower layer to obtain the magnetic graphene-based platinum-nickel bimetallic catalyst. The magnetic graphene-based platinum-nickel bimetallic catalyst can be separated out of a reaction system thoroughly under an external magnetic field, and the recovery process is simple and efficient.

Description

technical field [0001] The present invention relates to a catalyst. In particular, it relates to a magnetic graphene-based platinum-nickel bimetallic catalyst and a preparation method thereof. Background technique [0002] Metal / graphene nanocomposites are widely used in the field of catalysis. Graphene not only has good electrical and thermal conductivity and thermal stability, but also has a stable structure. The surface of partially reduced graphene or modified graphene has a certain amount of oxygen-containing functional groups, which can act as nucleation centers for metal nanoparticles and promote their growth. The standard two-dimensional structure of graphene means twice the specific surface area, and the increase in active sites leads to an increase in the metal loading while reducing the agglomeration of metal nanoparticles. The reactants can contact the catalytically active components from the upper and lower sides, thereby greatly increasing the reaction rate....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 范晓彬刘茹朱远蹠张国亮张凤宝
Owner TIANJIN UNIV
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