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Preparation method of Pd-Ag/C catalyst

A catalyst and carbon carrier technology, which is applied in the field of preparation of small molecule alcohol fuel oxidation catalysts, can solve the problems of unsatisfactory catalytic activity and stability of the catalyst, and achieve the effects of being beneficial to environmental protection, high activity, and accelerating the process of industrialization

Active Publication Date: 2013-07-10
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

Similar to the conventional method, in order to reduce the particle size of the catalyst, a protective agent is added in the preparation process, so the catalytic activity and stability of the catalyst prepared by this method are still unsatisfactory, and further work is still needed on the basis of the existing technology. improvement of

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  • Preparation method of Pd-Ag/C catalyst
  • Preparation method of Pd-Ag/C catalyst
  • Preparation method of Pd-Ag/C catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Example 1: 20% Pd 4 Ag 1 / C-500 (20% means that the mass content of active components Pd and Ag is 20%, wherein the molar ratio of Pd and Ag is 4:1, -500 means that the reduction temperature is 500°C)

[0046] First, ultrasonically disperse 80 mg of Vulcan XC-72 carbon black in 30 mL of absolute ethanol, and then add 30 mL of Pd(NO 3 ) 2 Aqueous solution 2.04mL and 6.4mgAgNO 3 mixed aqueous solution. The above solution was impregnated and stirred at room temperature for 6 hours, then the solvent was removed by a rotary evaporator at 65°C, and dried at 65°C to obtain a black powder. The above black powder was ground, weighed, and placed in a quartz boat, and then transferred to a tube furnace at N 2 Under atmosphere at 5°C min -1 The rate was programmed to heat up to 120°C, and treated at this temperature for 0.5h, then at 5°C min -1 The rate was programmed to 500 °C through a volume fraction of 5% H 2 and N 2 The mixed gas, heat treatment at constant temperatur...

Embodiment 2

[0047] Example 2: 20% Pd 3 Ag 1 / C-500 (14.95% Pd-5.05% Ag / C-500) (20% means that the mass content of active components Pd and Ag is 20%, wherein the molar ratio of Pd and Ag is 3:1, -500 means Reduction temperature is 500°C)

[0048] First, ultrasonically disperse 80 mg of Vulcan XC-72 carbon black in 30 mL of absolute ethanol, and then add 30 mL of Pd(NO 3 ) 2 Aqueous solution 1.92mL and 8.0mgAgNO 3 mixed aqueous solution. The above solution was impregnated and stirred at room temperature for 6 hours, then the solvent was removed by a rotary evaporator at 65°C, and dried at 65°C to obtain a black powder. The above black powder was ground, weighed, and placed in a quartz boat, and then transferred to a tube furnace at N 2 Under atmosphere at 5°C min -1 The rate was programmed to heat up to 120°C, and treated at this temperature for 0.5h, then at 5°C min -1 The rate was programmed to 500 °C through a volume fraction of 5% H 2 and N 2 The mixed gas, heat treatment at ...

Embodiment 3

[0049] Example 3: 20% Pd 1 Ag 1 / C-500 (20% means that the mass content of active components Pd and Ag is 20%, wherein the molar ratio of Pd and Ag is 1:1, -500 means that the reduction temperature is 500°C)

[0050] First, ultrasonically disperse 80 mg of Vulcan XC-72 carbon black in 30 mL of absolute ethanol, and then add 30 mL of Pd(NO 3 ) 2 Aqueous solution 1.27mL and 15.9mgAgNO 3 mixed aqueous solution. The above solution was impregnated and stirred at room temperature for 6 h, and then the solvent was removed using a rotary evaporator at 65° C., and dried at 65° C. to obtain a black powder. The above black powder was ground, weighed, and placed in a quartz boat, and then transferred to a tube furnace at N 2 Under atmosphere at 5°C min -1 The rate was programmed to heat up to 120°C, and treated at this temperature for 0.5h, then at 5°C min -1 The rate was programmed to 500 °C through a volume fraction of 5% H 2 and N 2 The mixed gas, heat treatment at constant te...

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Abstract

The invention relates to a preparation method of a Pd-Ag / C catalyst, wherein, Pd accounts for 1-30% by mass, and the mass of Ag is not greater than 25% of Pd content. The catalyst is prepared by an impregnation-reduction method, which comprises: (1) dispersion of a carbon carrier, (2) preparation of an impregnation solution and (3) preparation of a Pd-Ag / C catalyst. In the preparation process of the catalyst, a protective agent is not needed to be added to control catalyst particle size and alloy degree. In an alkaline medium, the catalyst has high catalytic activity on oxidation of small molecular alcohol and good stability, and the preparation process has no toxicity and pollution, so that the catalyst can be produced in large scale. And the catalyst of the invention can be used as an electrochemical oxidation catalyst of medium and small molecular alcohol in an alkaline medium, and is especially suitable to be used as a small molecular alcohol fuel oxidation catalyst of alkaline direct alcohol fuel cells.

Description

technical field [0001] The invention relates to a small molecule alcohol oxidation catalyst under alkaline conditions, in particular to a preparation method for a small molecule alcohol fuel oxidation catalyst used in an alkaline fuel cell. Background technique [0002] With the research and development of anion exchange membranes, the problem of carbonation in alkaline fuel cells has been solved to a certain extent. In alkaline solution, on the one hand, due to the fast kinetics of electrochemical oxidation and oxygen reduction of small molecule fuels such as methanol and ethanol, the catalytic efficiency of fuel cells can be greatly improved; on the other hand, because non-Pt electrocatalysts can be used , can reduce the cost of fuel cells. Therefore, alkaline fuel cells have attracted extensive attention of researchers. [0003] The literature (Electrochemistry Communications 2007; 9: 2760-2763) pointed out that the catalytic activity of carbon-supported Pd electrocatal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J37/02H01M4/88H01M4/90
CPCY02E60/50
Inventor 孙公权李光兰姜鲁华姜黔王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI