Palladium nano-composite catalyst loaded by N-doped three-dimensional graphene and preparing method and application thereof

A nitrogen-doped graphene and composite catalyst technology, which is applied in the field of catalysis, can solve the problems of decreased cycle efficiency and stability of noble metal/3D graphene composite materials, lack of active sites, and limited applications, and achieves excellent reuse performance, Improve catalytic activity and stability, reduce bleed effect

Inactive Publication Date: 2016-05-11
ZHENJIANG COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the lack of sufficient active sites on the surface of these 3D graphene, the interaction between graphene and noble metal nanoparticles is weakened, which directly leads to the decrease of cycle efficiency and stability of noble metal / 3D graphene composites.
These problems limit the application of this type of catalyst, so the development of new three-dimensional graphene / palladium nanocatalysts with high activity, high dispersion and high stability has important practical application value

Method used

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  • Palladium nano-composite catalyst loaded by N-doped three-dimensional graphene and preparing method and application thereof
  • Palladium nano-composite catalyst loaded by N-doped three-dimensional graphene and preparing method and application thereof
  • Palladium nano-composite catalyst loaded by N-doped three-dimensional graphene and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of graphene oxide:

[0022] Take graphite powder and sodium nitrate, add concentrated sulfuric acid and stir evenly, then put it into an ice bath, add potassium permanganate while stirring, keep the temperature below 20°C, then raise the temperature to 35°C and keep it warm for 1~2h, then slowly add to remove Deionized water, the volume ratio of deionized water and concentrated sulfuric acid added is 2:1, and the temperature is raised to 85~95°C, kept for 15 minutes, and then 10mL of 30% hydrogen peroxide and deionized water are added, and the deionized water added at this time The volume ratio of water to concentrated sulfuric acid is 6:1, and the obtained product is centrifuged, washed with dilute hydrochloric acid, dried, and ground to obtain graphene oxide; the mass ratio of graphite powder to sodium nitrate is 2:1, concentrated sulfuric acid and graphite The ratio of powder is 23mL / mg, and the mass ratio of potassium permanganate to graphite powder ...

Embodiment 2

[0027] (1) The preparation of graphene oxide is the same as in Example 1;

[0028] (2) Preparation of nitrogen-doped three-dimensional graphene supported palladium nanocomposite catalyst:

[0029] Weigh 150 mg of the above-prepared graphene oxide and add it to a beaker, add 30 mL of deionized water, ultrasonically disperse for 90 min, add 1 mL of formaldehyde solution (37%wt) and 300 mg of urea to it in turn, and transfer the resulting solution to a polytetrafluoroethylene hydrothermal In the liner of the reaction kettle, seal it, and keep the temperature at a reaction temperature of 150°C for 12h. After the reaction, the reactor was naturally cooled to room temperature, and the three-dimensional nitrogen-doped graphene carrier material (3D-NGN) was obtained after freeze-drying.

[0030] Disperse 50mg of 3D-NGN composite material in 10mL of deionized water, add dropwise 2mL of 0.01mol / LH 2 PdCl 4 solution, continue to stir and react for 2h, add 3mL concentration of 0.2mol / L s...

Embodiment 3

[0032] (1) The preparation of graphene oxide is the same as in Example 1;

[0033] (2) Preparation of nitrogen-doped three-dimensional graphene-supported palladium nanocomposite catalyst:

[0034] Weigh 150 mg of the above-prepared graphene oxide and add it to a beaker, add 30 mL of deionized water, ultrasonically disperse for 90 min, add 1.5 mL of formaldehyde solution (37%wt) and 450 mg of urea to it in turn, and transfer the resulting solution to polytetrafluoroethylene water In the liner of the thermal reaction kettle, seal it, and keep the temperature at 180°C for 24 hours. After the reaction, the reactor was naturally cooled to room temperature, and the three-dimensional nitrogen-doped graphene carrier material (3D-NGN) was obtained after freeze-drying.

[0035] Disperse 100mg of 3D-NGN composite material in 20mL of deionized water, add dropwise 6mL of 0.01mol / LH 2 PdCl 4 The solution was stirred and reacted for 3 hours, 9 mL of ascorbic acid with a concentration of 0...

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Abstract

The invention discloses a palladium nano-composite catalyst loaded by N-doped three-dimensional graphene and a preparing method and application thereof. The method includes the steps that a formaldehyde solution and a nitrogen source are added into an oxidized graphene solution, a N-doped three-dimensional graphene composite material is prepared through a hydrothermal method, then a H2PdCl4 solution and a reducing agent are added to obtain the palladium nano-composite catalyst loaded by N-doped three-dimensional graphene, a carrier of the catalyst is graphene of a N-doped three-dimensional structure, loaded active ingredients are palladium nano particles, the loading capacity of the Pd nano particles accounts for 5-15% of the total mass of the catalyst, and the particle size is 5-10 nm. The palladium nano-composite catalyst loaded by N-doped three-dimensional graphene is applied to a Suzuki reaction of halogeno benzene and phenylboronic acid and shows high catalytic activity and high reusability.

Description

technical field [0001] The invention relates to a catalyst, in particular to a nitrogen-doped three-dimensional graphene-supported palladium nanocomposite catalyst and a preparation method and application thereof, belonging to the technical field of catalysis. Background technique [0002] With the maturity of nanomaterial synthesis technology, noble metal nano-palladium catalysts have attracted extensive attention of researchers due to their high-efficiency catalytic performance, small size, and high surface activity. The scope of application of nano-palladium catalysts is constantly expanding, especially in the field of catalysis. However, the traditional homogeneous nano-palladium catalysts have disadvantages such as easy agglomeration, easy loss and difficult recovery in liquid phase reactions, which severely limit their practical application and improvement of catalytic performance. Immobilizing nano-palladium catalysts with catalytic activity is an important means to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C1/32C07C15/14C07C201/12C07C205/06
CPCB01J27/24B01J35/1004C07C1/321C07C201/12C07C2527/24
Inventor 刘想赵晓华朱建军邢正王国喜邱舒
Owner ZHENJIANG COLLEGE
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