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

A nano-catalyst and composite metal technology, which can be used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It is difficult to achieve satisfactory levels and other problems, to achieve excellent electrocatalytic performance, good uniformity and dispersion, and the effect of preventing aggregation

Inactive Publication Date: 2009-06-24
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 nano catalyst
  • Complex reduction method for preparing highly alloyed Pt-based compound metal nano catalyst
  • Complex reduction method for preparing highly alloyed Pt-based compound metal nano 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, in which the particle size of the catalyst 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 t...

Embodiment 2

[0037] 1. Weigh 60mg of self-made carbon nanotubes with a tube 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

The complex reduction preparation method of highly alloyed platinum-based composite metal nanocatalysts: precursor injection: adding a solution of Pt compound and other metal compounds to the carbon carrier; adding complexing agent mixed solution to the above mixture, and stirring to obtain component A , other metals refer to Ru, Ir or Cr; low-temperature liquid phase reduction: component A is stirred with excess reducing agent solution at 0-80°C, and the reduced metal salt particles are adsorbed on the carbon carrier to obtain component B; Treatment: Component B is dried to remove the solvent, washed with water and alcohol in sequence; dried at 40-150°C under a certain atmosphere to obtain a PtM / C catalyst supported by a carbon carrier (M=Ru, Ir or Cr). The invention changes the electrode potential of the Pt complex to simultaneously reduce the Pt and other metals, achieves the orderly deposition of multiple metals on the surface of the carbon carrier, and improves the alloying degree of the composite metal.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/24B01J23/56B01J37/02
Inventor 唐亚文陈煜陆天虹
Owner NANJING NORMAL UNIVERSITY
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