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Complex reduction method for preparing highly alloyed Pt-based compound metal nato catalyst

A nano-catalyst and composite metal technology, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Satisfactory, reducing the catalytic performance of the catalyst, reducing the surface area of ​​the platinum-based alloy, etc., to achieve excellent electrocatalytic performance, improved electrocatalytic oxidation performance, and the effect of increasing the degree of alloying

Inactive Publication Date: 2006-01-18
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High dispersion, uniformity, and high alloying of alloy atomic clusters are a necessary condition for highly active catalysts. These platinum-based alloy catalysts are usually prepared under inert conditions at high temperatures of several hundred degrees, and heat treatment at high temperatures easily causes metal particles The agglomeration phenomenon, thereby reducing the surface area of ​​the platinum-based alloy and reducing the catalytic performance of the catalyst
At the same time, the degree of alloying of platinum-based alloy atomic clusters is difficult to reach a satisfactory level even under high temperature conditions of hundreds of degrees.

Method used

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  • Complex reduction method for preparing highly alloyed Pt-based compound metal nato catalyst
  • Complex reduction method for preparing highly alloyed Pt-based compound metal nato catalyst
  • Complex reduction method for preparing highly alloyed Pt-based compound metal nato catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Weigh 60mg of Cabot’s Vulcan XC-72R activated carbon powder, add 1.32ml of 0.0386mol / L H 2 PtCl 6 solution and 0.52ml 0.09635mol / L RuCl 3 , and then add a mixed solution of tetrahydrofuran and water, and stir at high speed for 20 hours to make the mixture uniform.

[0030] 2. At 10°C, slowly add excess reducing agent solution (NaBH 4 ), and mechanically stirred for 1 hour to completely react the metal salt with the reducing agent.

[0031] 3. After drying to remove the solvent, wash with water and alcohol for several times, and check with silver nitrate solution until there is no chloride ion in the eluate. Dry at 60°C under air conditions to obtain a Pt-Ru / C catalyst, wherein the catalyst particle size is about 1.5-3.5nm.

[0032] XRD pattern of homemade PtRu / C catalyst with metal loading of 20% and PtRu atomic ratio of 1:1.

[0033] figure 1It shows that the catalyst has a higher degree of alloying. In the alloy, the atomic fraction of Ru is 46%, and the allo...

Embodiment 2

[0037] 1. Weigh 60mg of self-made carbon nanotubes with a diameter of 10-20nm, add 1.32ml of 0.0386mol / LH 2 PtCl 6 solution and 0.52ml0.09635mol / L RuCl 3 , followed by adding a mixed solution of tetrahydrofuran, water and ethanol, and stirring at high speed for 20 hours to make the mixture uniform.

[0038] 2. At 60°C, slowly add excess reducing agent solution (HCOONa), and mechanically stir for 4 hours to completely react the metal salt with the reducing agent.

[0039] 3. After drying to remove the solvent, wash with water and alcohol for several times, and check with silver nitrate solution until there is no chloride ion in the eluate. Dry at 60°C under air condition to prepare Pt-Ru / CNTs catalyst, wherein the particle size of the catalyst is about 1.5-3.5nm.

Embodiment 3

[0041] 1. Weigh 60mg of Cabot's Vulcan XC-72R activated carbon powder, add 1.32ml of 0.0386mol / L H 2 PtCl 6 solution and 0.52ml0.09635mol / L OsCl 3 , and then add a mixed solution of 1,4-dioxane and water, and stir at high speed for 20 hours to make the mixture uniform.

[0042] 2. At 80°C, slowly add excess reducing agent solution (Na 2 S 2 o 4 ), and mechanically stirred for 1 hour to completely react the metal salt with the reducing agent.

[0043] 3. After drying to remove the solvent, wash with water and alcohol for several times, and check with silver nitrate solution until there is no chloride ion in the eluate. The Pt-Os / C catalyst is obtained by drying at 60° C. under vacuum condition, wherein the particle size of the catalyst is about 1.5-3.5 nm.

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Abstract

Complex reduction preparation method for high alloying Pt-based composition nano metal catalyst comprises: inject in precursor: add solution of Pt compound and other metal compound in carbon-carrier; mix and obtain constituent A; the other metals mean Ru, Os, Pd, Rh, Ir or Cr; take liquid-phase reduction at low temperature: add excessive reducer solution and mix, the reduced metal salt particles absorb on carbon carrier, and obtain constituent B; post process: bake and de-solvent to the constituent B, take bath in water and alcohol; dry at 40-150Deg, and obtain carbon carried PtM / C catalyst (M= Ru, Os, Pd, Rh, Ir or Cr). This invention changes electrode potential and reduces Pt and other metal at the same time to achieve the ordered sedimentation of multiple metals and improve alloying degree.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a catalyst for a direct alcohol fuel cell—a highly alloyed platinum-based composite metal nano-catalyst by complex reduction. The catalyst is suitable for methanol, formic acid, H 2 The electrochemical oxidation of mixed gas with CO and the electrocatalytic reduction of oxygen exhibit high catalytic performance. Background technique [0002] Due to the advantages of high energy conversion efficiency and low environmental pollution, fuel cells will become the best "clean energy" in the future, and many governments attach great importance to their research. In particular, direct alcohol fuel cells have attracted extensive attention in recent years due to their potential as power sources for electric vehicles and portable mobile power sources. The anode catalyst of direct alcohol fuel cell is basically a multi-component catalytic system of alloying Pt or ...

Claims

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Application Information

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IPC IPC(8): B01J23/24B01J23/56B01J37/02
Inventor 唐亚文陈煜陆天虹
Owner NANJING NORMAL UNIVERSITY
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