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Noble metal nanocatalyst loaded on dendritic macromolecule functionalized graphene and preparation method thereof

A nano-catalyst and macromolecular technology, applied in the field of nano-materials, can solve problems such as inconvenience

Inactive Publication Date: 2012-09-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This shows that above-mentioned existing catalyzer obviously still has inconvenience and defect in method, product structure and use, and urgently needs to be further improved

Method used

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  • Noble metal nanocatalyst loaded on dendritic macromolecule functionalized graphene and preparation method thereof
  • Noble metal nanocatalyst loaded on dendritic macromolecule functionalized graphene and preparation method thereof
  • Noble metal nanocatalyst loaded on dendritic macromolecule functionalized graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1 1st Generation Dendrimer Functionalized Graphene Supported Noble Metal Nanoclusters and Preparation Method

[0076] (1) Add 10g of 500-mesh natural flake graphite to a mixed solution of 300mL concentrated sulfuric acid and 5g sodium nitrate, mix well, add 30g potassium permanganate, control the temperature below 10°C with an ice bath, and react for about 2-3 hours ; Then add 300mL of water to raise the temperature of the system to 90°C, continue to react for 20min, then add 350mL of 5% hydrogen peroxide aqueous solution, stir for 30min, filter while hot, fully pickle, and dry at 50°C for 24 hours to obtain oxidation Graphite, denoted as GO.

[0077] (2) Amino-terminated functionalized graphene oxide: Disperse 5 g of graphite oxide in 100 mL of dry methanol, add 6 mL of 3-aminopropyltrimethoxysilane under an inert atmosphere, and reflux for 3 days; filter, wash with alcohol, and Amino-functionalized graphene oxide can be obtained by drying at room temperature,...

Embodiment 2

[0080] Example 2 2nd Generation Dendrimer Functionalized Graphene Supported Noble Metal Nanoclusters and Preparation Method

[0081](1) Add 10g of 500-mesh natural flake graphite to a mixed solution of 300mL concentrated sulfuric acid and 5g sodium nitrate, mix well, add 30g potassium permanganate, control the temperature below 10°C with an ice bath, and react for about 2-3 hours ; Then add 300mL of water to raise the temperature of the system to 90°C, continue to react for 20min, then add 350mL of 5% hydrogen peroxide aqueous solution, stir for 30min, filter while hot, fully pickle, and dry at 50°C for 24 hours to obtain oxidation Graphite, denoted as GO.

[0082] (2) Amino-terminated functionalized graphene oxide: Disperse 5 g of graphite oxide in 100 mL of dry methanol, add 6 mL of 3-aminopropyltrimethoxysilane under an inert atmosphere, and reflux for 3 days; filter, wash with alcohol, and Amino-functionalized graphene oxide can be obtained by drying at room temperature, ...

Embodiment 3

[0085] Example 3 3rd Generation Dendrimer Functionalized Graphene Supported Noble Metal Nanoclusters and Preparation Method

[0086] (1) Add 10g of 500-mesh natural flake graphite to a mixed solution of 300mL concentrated sulfuric acid and 5g sodium nitrate, mix well, add 30g potassium permanganate, control the temperature below 10°C with an ice bath, and react for about 2-3 hours ; Then add 300mL of water to raise the temperature of the system to 90°C, continue to react for 20min, then add 350mL of 5% hydrogen peroxide aqueous solution, stir for 30min, filter while hot, fully pickle, and dry at 50°C for 24 hours to obtain oxidation Graphite, denoted as GO.

[0087] (2) Amino-terminated functionalized graphene oxide: Disperse 5 g of graphite oxide in 100 mL of dry methanol, add 6 mL of 3-aminopropyltrimethoxysilane under an inert atmosphere, and reflux for 3 days; filter, wash with alcohol, and Dry at room temperature to obtain amino-functionalized graphene oxide, denoted as ...

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Abstract

The invention relates to a noble metal nanocatalyst loaded on a dendritic macromolecule functionalized graphene and a preparation method thereof. The nanocatalyst is composed of graphene, silane coupling agents, dendritic macromolecules and noble metal nanoclusters, wherein the dendritic macromolecules are amino-terminated polyamide-amine (PAMAM) dendritic macromolecules, and the noble metal nanoclusters comprise palladium, platinum, gold, silver, ruthenium, iridium, osmium and related alloys. Aminos are introduced onto the surfaces of exfoliated graphene by the silane coupling agents, then different generations of the dendritic macromolecules are covalently introduced, and further the nanoclusters of noble metals and the related alloys are loaded by using the above-obtained materials as templates. The loaded noble metal nanocatalyst is not easy to agglomerate or to fall off during catalytic processes, and has high catalytic activity. The loaded noble metal nanoclusters has the characteristics of tunable size and controllable shape, and the structure and composition of the noble metal alloys can be controlled accurately. The method is simple in process and short in period, and can easily realize industrial production.

Description

technical field [0001] The invention relates to a dendrimer functionalized graphene-loaded noble metal nano catalyst and a preparation method thereof, belonging to the technical field of nano materials. Background technique [0002] As a new class of catalysts, noble metal nanoclusters have unique structure-reaction properties that traditional catalysts do not possess. They have shown unusual catalytic activity and performance in many reactions such as methanol carbonylation, propylene hydroformylation, biscarbonylation, Heck reaction, selective hydrogenation and asymmetric hydrogenation of various reactants. selectivity (Liu Hanfan, Proceedings of the Chinese Academy of Sciences, 2001, 1, 36-38.); In addition, noble metal nanoclusters can also be used as efficient catalysts for hydrogen production from borohydride hydrolysis (Liu B.H., Li Z.P., J.Power Sources, 2009, 187, 527-534.), excellent electrode catalysts for proton exchange membrane fuel cells (Zhou W., Xu J., DuY....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28
Inventor 彭淑鸽刘军娜李召辉刘晓飞郭永克
Owner HENAN UNIV OF SCI & TECH
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