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Compound catalyst with nanometer core-shell structure and preparing method of compound catalyst

A composite catalyst and nano-core-shell technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as weak interaction force, low catalytic performance, uncontrollable catalyst structure, etc., to achieve Effects of preventing agglomeration, improving catalytic performance, and being easy to control

Inactive Publication Date: 2018-04-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main preparation methods of noble metal / metal oxide composite catalysts include electrodeposition method, microwave method, precipitation method, etc. Although the noble metal / metal oxide composite catalysts prepared by these methods have good performance, the catalyst structure is uncontrollable. Moreover, the interaction between noble metals and metal oxides is weak, and the catalytic performance is low

Method used

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  • Compound catalyst with nanometer core-shell structure and preparing method of compound catalyst
  • Compound catalyst with nanometer core-shell structure and preparing method of compound catalyst
  • Compound catalyst with nanometer core-shell structure and preparing method of compound catalyst

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preparation example Construction

[0038] The present invention also provides the preparation method of the composite catalyst of above-mentioned nano core-shell structure, and its preparation process is as follows figure 2 As shown, it mainly includes the following steps:

[0039] Step 1, mix the metal oxide precursor and the alkaline substance at a mass ratio of 1:1-5 to make a solution, react at 100-200°C for 12-48h, and then cool to room temperature, at 3000-10000rpm Centrifuge the solution at a rotating speed for 5-10min to obtain a solid product A; wherein the metal oxide precursor is Al 2 o 3 , Ga 2 o 3 , SiO 2 、GeO 2 、TiO 2 , ZrO 2 , V 2 o 5 、Cr 2 o 3 , MnO 2 , Fe 2 o 3 , Fe 3 o 4 、Co 2 o 3 , NiO, CuO, ZnO, Nb 2 o 5 、MoO 3 , RuO 2 、In 2 o 3 , CeO 2 , Sb 2 o 3 , Sb 2 o 5 , Tl 2 o 3 , PbO, Bi 2 o 3 , La 2 o 3 、 Ta 2 o 5 、WO 2 、WO 3 or SnO 2 One or more of nitrates, phosphates, sulfates, sulfites, chlorates or carbonates; the alkaline substances are NaOH, KOH, Ba(OH...

Embodiment 1

[0047] Use PbO, its precursor is nitrate, the noble metal is Pb, its precursor is Pb nitrate, the alkaline solution can be NaOH, and the carbon source can be glucose, fructose, sucrose or sucrose. Concrete preparation process is as follows;

[0048] Step 1, mix the precursor nitrate of PbO with NaOH according to the mass ratio of 1:5 and make a solution, react at 100°C for 24h, then cool to room temperature, and then centrifuge the solution at 3000rpm for 5min , to obtain solid product A;

[0049] In step 2, the solid product A is centrifuged and washed with ethanol and deionized water, and then freeze-dried in a vacuum environment for 5 hours to obtain PbO nanoparticles, and the particle size of the PbO nanoparticles is 20-50nm.

[0050] Step 3, dissolve 10g of PbO nanoparticles in deionized water, add 200g of surfactant, then add 500g of carbon source, the carbon source is glucose, after stirring for 2h, react the mixed solution at 150°C for 3h, then cool to At room temper...

Embodiment 2

[0055] The metal oxide used in this example is Al 2 o 3 , Ga 2 o 3 , SiO 2 、GeO 2 、TiO 2 , ZrO 2 , V 2 o 5 、Cr 2 o 3 , MnO 2 , Fe 2 o 3 , Fe 3 o 4 、Co 2 o 3 , NiO, CuO, ZnO, Nb 2 o 5 、MoO 3 , RuO 2 、In 2 o 3 , CeO 2 , Sb 2 o 3 , Sb 2 o 5 , Tl 2 o 3 、 Bi 2 o 3 , La 2 o 3 、 Ta 2 o 5 、WO 2 、WO 3 、 Bi 2 o 3 and SnO 2 A kind of in; Its implementation process is all identical with embodiment 1, obtains corresponding metal oxide nanoparticle at last, and is covered with carbon layer on it, is covered with a plurality of Pb nanoparticles on the carbon layer, the particle diameter of Pb nanoparticle Between 2-10nm.

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Abstract

The invention discloses a compound catalyst with a nanometer core-shell structure and a preparing method of the compound catalyst. The compound catalyst comprises metallic oxide nanometer particles, the metallic oxide nanometer particles are coated with a carbon layer, and multiple precious metal nanometer particles are uniformly distributed outside the carbon layer, wherein the particle diameterof the metallic oxide nanometer particles is 20-50 nm, the particle diameter of the precious metal nanometer particles is 2-10 nm, and the thickness of the carbon layer is 2-10 nm. The compound catalyst can prevent aggregation of the precious metal nanometer particles, and change the electronic state and adsorption properties of the surface of the precious metal nanometer particles, and then the catalysis performance is improved; meanwhile, the carbon layer can strengthen the mutual acting force among the precious metal nanometer particles and the metallic oxide nanometer particles. Precursorslike chlorizated salts and nitrate are adopted, metallo-organic compounds needed for preparation of a catalyst of a specific structure are omitted, and the preparing cost is lowered; meanwhile, templates are not needed in the preparing process, and the operation is simple and easy to control.

Description

technical field [0001] The invention belongs to the technical field of preparation of alcohol fuel cells, relates to a catalyst for preparing alcohol fuel cells, and specifically relates to a composite catalyst with a nano core-shell structure and a preparation method thereof. Background technique [0002] Alcohol fuel cell is a green energy technology that directly converts the chemical energy of alcohol fuel into electrical energy. It has the advantages of no pollution, high energy conversion efficiency, wide sources, high safety, and convenient storage and transportation. The two major problems facing the world (energy crisis, environmental pollution) are of great significance. At present, the catalysts widely used in alcohol fuel cells rely heavily on noble metal catalysts, and noble metal catalysts are prone to agglomeration, dissolution, poisoning, and shedding of active components, resulting in reduced catalyst performance and directly affecting battery life. Factors...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01J23/46B01J23/62B01J23/63B01J23/648B01J23/652B01J23/66B01J23/68B01J35/02B01J37/00B01J37/08B01J37/32
CPCB01J23/14B01J23/466B01J23/62B01J23/626B01J23/628B01J23/63B01J23/648B01J23/6484B01J23/652B01J23/66B01J23/682B01J23/683B01J23/687B01J37/009B01J37/084B01J37/32B01J35/396B01J35/393B01J35/50
Inventor 谭强屈婷柳永宁陈元振
Owner XI AN JIAOTONG UNIV
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