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Palladium-transition metal oxide-graphene ternary composite catalyst and preparation method thereof

A composite catalyst and transition metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, preparation of organic compounds, etc., to achieve high catalytic activity, good stability, good application prospects and economical benefit effect

Inactive Publication Date: 2012-12-12
NANJING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to support highly dispersed palladium on graphene, especially the preparation of palladium-transition metal oxide-graphene ternary composites is still a challenging work.

Method used

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  • Palladium-transition metal oxide-graphene ternary composite catalyst and preparation method thereof
  • Palladium-transition metal oxide-graphene ternary composite catalyst and preparation method thereof
  • Palladium-transition metal oxide-graphene ternary composite catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: palladium-manganese dioxide-graphene ternary composite catalyst (manganese dioxide: the mass ratio of graphene oxide is 1:4.6; Palladium: the mass ratio of manganese dioxide-graphene oxide binary composite is 1 :10)

[0029] (1) Add 400mg of graphite oxide into 600mL of deionized water, and ultrasonicate at 30°C for 2 hours to obtain a dispersed solution of graphene oxide;

[0030] (2) Add 20mL of 0.50mol / L potassium permanganate solution to the system in the first step, and stir and react at 20°C for 12 hours;

[0031] (3) Centrifuge the system in the second step to separate the solid product, wash it with deionized water, and dry it at 60°C to obtain a manganese dioxide-graphene oxide composite;

[0032] (4) Weigh 20 mg of the manganese dioxide-graphene oxide composite obtained in the third step, place it in a mixture of 30 mL deionized water and 50 mL ethylene glycol, and ultrasonicate at 30°C for 2 hours to obtain manganese dioxide- Dispersion soluti...

Embodiment 2

[0037] Example 2: Palladium-titania-graphene ternary composite catalyst (mass ratio of titanium dioxide: graphene oxide is 1:10; palladium: titanium dioxide-graphene oxide binary composite mass ratio is 40:1)

[0038] (1) Add 400mg of graphite oxide to 4000mL of deionized water, and sonicate at 20°C for 1 hour to obtain a dispersed solution of graphene oxide;

[0039] (2) Add 0.18mL of butyl titanate to the system in the first step, and stir and react at 120°C for 1 hour;

[0040] (3) Centrifuge the system in the second step to separate the solid product, wash it with deionized water, and dry it at 40°C to obtain a titanium dioxide-graphene oxide composite;

[0041] (4) Weigh 8 mg of the titanium dioxide-graphene oxide composite obtained in the third step, place it in a mixture of 10 mL deionized water and 70 mL ethylene glycol, and ultrasonicate at 20°C for 1 hour to obtain a titanium dioxide-graphene oxide composite The dispersion solution of the substance;

[0042] (5) Add ...

Embodiment 3

[0044] Example 3: Palladium-cobalt tetroxide-graphene ternary composite catalyst (mass ratio of cobalt tetroxide:graphene oxide is 10:1; palladium:cobalt tetroxide-graphene oxide binary composite mass ratio is 1:40)

[0045] (1) Add 400mg of graphite oxide to 40mL of deionized water, and ultrasonicate at 40°C for 3 hours to obtain a dispersed solution of graphene oxide;

[0046] (2) Add 49.83mL of 1.0mol / L cobalt nitrate solution to the system in the first step, and stir and react at 200°C for 72 hours;

[0047] (3) Centrifuge the system in the second step to separate the solid product, wash it with deionized water, and dry it at 80°C to obtain the tricobalt tetroxide-graphene oxide composite;

[0048] (4) Weigh 800 mg of the tricobalt tetroxide-graphene oxide composite obtained in the third step, place it in a mixture of 70 mL deionized water and 10 mL ethylene glycol, and ultrasonicate at 40°C for 3 hours to obtain the tricobalt tetroxide-graphene oxide composite The disper...

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Abstract

The invention relates to a palladium-transition metal oxide-graphene ternary composite catalyst and a preparation method thereof. The method comprises the following steps of: putting graphite oxide in water and performing ultrasonic dispersion; adding saline solution of transition metal to the water and continuously stirring to enable the system to be fully and evenly mixed; then, heating a certain temperature for reaction; performing centrifugal separation after the reaction is ended to obtain a solid product; putting in a mixed solution of the water and ethylene glycol for the ultrasonic dispersion; adding palladium nitrate solution to the mixed solution and evenly mixing; and then, transferring the mixed system to a hydrothermal kettle for reaction to obtain the palladium-transition metal oxide-graphene ternary composite catalyst. The catalyst is better in application prospect and economic benefit in the field of catalytic organic reaction and fuel cells.

Description

technical field [0001] The invention relates to a composite catalyst and a preparation method thereof, in particular to a palladium-transition metal oxide-graphene ternary composite and a preparation method thereof. technical background [0002] Metal palladium is widely used in organic synthesis, fuel cells, petroleum cracking, and environmental protection because of its unique catalytic activity. However, during the catalytic reaction, palladium nanoparticles are prone to agglomeration, which affects the original activity and selectivity of the catalyst. In addition, as a noble metal catalyst, the precious metal palladium has limited reserves and high price, which largely restricts its application in many aspects. Therefore, it is of great significance for the economic development and environmental improvement of today's society to seek new composite palladium catalysts with excellent properties such as high catalytic activity, high toxicity resistance and high stability,...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/44B01J23/89B01J37/16C07C215/76C07C213/02
Inventor 汪信黄华杰孙小强朱俊武陈海群何浩明付永胜陈群何明阳何光裕张文耀钱华玉
Owner NANJING UNIV OF SCI & TECH
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