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A kind of method for preparing noble metal alloy/reduced graphene oxide composite material

A composite material and graphene technology, applied in the field of material science and engineering, to achieve the effect of uniform shape and particle size, mild reaction conditions, and narrow particle size distribution

Active Publication Date: 2021-04-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to homogeneous flow, it is difficult to avoid problems such as clogging caused by crystallization of particles on the wall during the preparation of micro-nano materials.

Method used

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  • A kind of method for preparing noble metal alloy/reduced graphene oxide composite material
  • A kind of method for preparing noble metal alloy/reduced graphene oxide composite material
  • A kind of method for preparing noble metal alloy/reduced graphene oxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this example, the micro-mixer I, reaction tube I, micro-mixer II, and reaction tube II were all placed in a constant temperature water bath / oil bath to control the reaction temperature, and the reaction temperature was 60°C.

[0050] (1) AgNO 3 , Pd(NO 3 ) 2 , polyvinylpyrrolidone, graphene oxide and water are configured into aqueous solution A. Among them, AgNO 3 and Pd(NO 3 ) 2 The molar concentration is respectively 0.25mmol / L and 0.25mmol / L, the mass concentration of polyvinylpyrrolidone is 2.0g / L, and the mass concentration ratio of total metal ion and graphene oxide is 0.19:1;

[0051] (2) Prepare two mixed aqueous solutions of sodium borohydride and sodium hydroxide with different concentrations, denoted as aqueous solution B and aqueous solution C. Wherein, the ratio of the molar concentration of sodium borohydride in the aqueous solution B to the total metal ions in the aqueous solution A is 3:1; the ratio of the molar concentration of sodium borohydri...

Embodiment 2

[0056] In this example, the micro-mixer I, reaction tube I, micro-mixer II, and reaction tube II were all placed in a constant temperature water bath / oil bath to control the reaction temperature, and the reaction temperature was 60°C.

[0057] (1) H 2 PtCl 6 , Cu(NO 3 ) 2, polyvinylpyrrolidone, graphene oxide and water are configured into an aqueous solution A. Among them, H 2 PtCl 6 and Cu(NO 3 ) 2 The molar concentration of the polyvinylpyrrolidone is 0.25mmol / L and 0.25mmol / L respectively, the mass concentration of polyvinylpyrrolidone is 2.0g / L, and the mass concentration ratio of total metal ions and graphene oxide is 0.23:1;

[0058] (2) Prepare two mixed aqueous solutions of sodium borohydride and sodium hydroxide with different concentrations, denoted as aqueous solution B and aqueous solution C. Wherein, the ratio of the molar concentration of sodium borohydride in the aqueous solution B to the total metal ions in the aqueous solution A is 3:1; the ratio of th...

Embodiment 3

[0063] In this example, the micro-mixer I, reaction tube I, micro-mixer II, and reaction tube II were all placed in a constant temperature water bath / oil bath to control the reaction temperature, and the reaction temperature was 60°C.

[0064] (1) H 2 PtCl 6 、H 2 PdCl 4 , polyvinylpyrrolidone, graphene oxide and water are configured into an aqueous solution A. Among them, H 2 PtCl 6 and H 2 PdCl 4 The molar concentration of the polyvinylpyrrolidone is 0.25mmol / L and 0.25mmol / L respectively, the mass concentration of polyvinylpyrrolidone is 2.0g / L, and the mass concentration ratio of total metal ions and graphene oxide is 0.27:1;

[0065] (2) Prepare two mixed aqueous solutions of sodium borohydride and sodium hydroxide with different concentrations, denoted as aqueous solution B and aqueous solution C. Wherein, the ratio of the molar concentration of sodium borohydride in the aqueous solution B to the total metal ions in the aqueous solution A is 3:1; the ratio of the ...

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Abstract

The invention provides a method for preparing a precious metal alloy / reduced graphene oxide composite material, which uses a liquid-liquid two-phase flow to continuously prepare a precious metal alloy / reduced graphene oxide composite material in a microchannel reactor. Specifically, metal precursor 1, metal precursor 2, polyvinylpyrrolidone, and graphene oxide are configured into aqueous solution A, and sodium borohydride and sodium hydroxide are configured into aqueous solution B and aqueous solution C. Then, aqueous solution A, aqueous solution B, and n-octane were simultaneously injected into the micromixer I and flowed into the reaction tube I for reaction. The reactants flow out from the reaction tube I and enter the micromixer II. The aqueous solution C is mixed and flows into the reaction tube II. The suspension obtained at the outlet of reaction tube II is centrifuged and washed. The invention has the advantages of continuous process, simple process, mild reaction conditions, wide applicability, short residence time, small average particle size of the alloy nanoparticles of the obtained composite material, narrow particle size distribution, and good batch-to-batch repeatability.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and relates to a method for preparing a precious metal alloy / reduced graphene oxide composite material by utilizing liquid-liquid two-phase flow in a microchannel reactor. Background technique [0002] In recent decades, bimetallic nanoparticles have attracted extensive attention due to their unique surface binding sites and electronic properties, which bring novel electronic properties and superior catalytic activities compared with their single-component metals. Because independent bimetallic nanoparticles tend to agglomerate in order to reduce the specific surface energy, resulting in a decrease in catalytic performance, researchers deposited metal nanoparticles on the carrier to prevent the agglomeration of bimetallic NPs and ensure good dispersion of bimetallic nanoparticles. . Graphene, a two-dimensional carbon material with a thickness of one to several atomic layers, is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J23/89B01J23/44B01J35/02C07C213/02C07C215/76B01J35/00
CPCB01J23/50B01J23/8926B01J23/44C07C213/02B01J35/40C07C215/76
Inventor 陈光文罗腊梅杨梅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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