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High-dispersion supported palladium/tungsten carbide catalyst and preparation method thereof

A technology of tungsten carbide catalyst and supported palladium, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the necessity and urgency of cost-increasing non-Pt catalyst research and development, and the difficulty of uniform dispersion of precious metals , low utilization rate of catalyst, etc., to achieve the effect of rich Pd resources, simple and easy preparation process, and low cost

Inactive Publication Date: 2015-08-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional tungsten carbide-supported Pt-based catalysts, due to the large tungsten carbide particles and low specific surface area, the noble metal is not easy to disperse evenly, making the utilization rate of the catalyst low
The cost of Pt has further exacerbated the necessity and urgency of non-Pt catalyst research and development

Method used

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  • High-dispersion supported palladium/tungsten carbide catalyst and preparation method thereof
  • High-dispersion supported palladium/tungsten carbide catalyst and preparation method thereof
  • High-dispersion supported palladium/tungsten carbide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: 20% Pd / WC 10 (20% means that the mass content of the active component Pd is 20%, and 10 means 10nm SiO 2 template)

[0034] Weigh 2g of ammonium metatungstate, dissolve 2.62g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 10nm SiO 2 Sol 5.3g (mass fraction 30%), stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 At 5°C min under atmosphere -1 The temperature was programmed to 550°C at a rate of 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 40°C for 12h, filter, wash, vacuum dry at 80°C for 6h, and weigh to obtain highly dispersed tungsten carbide material WC 10 . Dissolve 0.5588g of sodium citrate in 50mL of deionized water, add chloropalladiu...

Embodiment 2

[0035] Example 2: 20% Pd / WC 20 (20% means that the mass content of the active component Pd is 20%, and 20 means 20nm SiO 2 template)

[0036] Weigh 2g of ammonium metatungstate, dissolve 2.62g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 20nm SiO 2 Sol 4g (mass fraction 40%), stirred at 80°C for 3h; dried at 120°C for 5h to obtain the precursor solid. The above precursor solids were placed in a tube furnace, N 2 At 5°C min under atmosphere -1 The temperature was programmed to 550°C at a rate of 2°C min-1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 40°C for 12h, filter, wash, vacuum dry at 80°C for 6h, and weigh to obtain highly dispersed tungsten carbide material WC 20 . Dissolve 0.5588g of sodium citrate in 50mL of deionized water, add chloropalladium ...

Embodiment 3

[0037] Example 3: 20% Pd / WC 50 (20% means that the mass content of the active component Pd is 20%, and 50 means 50nm SiO 2 template)

[0038] Weigh 2g of ammonium metatungstate, dissolve 2.62g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 50nm SiO 2 Sol 4g (mass fraction 40%), stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 At 5°C min under atmosphere -1 The temperature was programmed to 550°C at a rate of 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 40°C for 12h, filter, wash, vacuum dry at 80°C for 6h, and weigh to obtain highly dispersed tungsten carbide material WC 50 . Dissolve 0.5588g of sodium citrate in 50mL of deionized water, add chloropalladium ...

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Abstract

The invention relates to a high-dispersion supported palladium / tungsten carbide catalyst and a preparation method thereof. The preparation method comprises precursor solution preparation, high temperature calcining, template etching, and dipping reduction loading with palladium. The prepared high-dispersion supported palladium / tungsten carbide can be used as an electrocatalyst and is a direct formic acid fuel cell anode electrocatalyst. The high-dispersion supported palladium / tungsten carbide catalyst has good stability, a narrow particle size dispersion range and a high catalyst utilization rate, prolongs a catalyst service life and reduces a fuel cell production cost. The preparation method solves the problem that the traditional preparation method has poor tungsten carbide dispersion effects and easily causes agglomeration so that specific surface area is reduced and a catalyst utilization rate is reduced.

Description

technical field [0001] The invention belongs to the field of energy materials and electrocatalysis, and relates to a highly dispersed and loaded palladium / tungsten carbide catalyst. The invention also relates to a preparation method of the highly dispersed supported palladium / tungsten carbide catalyst. Background technique [0002] In 1973, Levy and Boundart of Germany reported that tungsten carbide has Pt-like properties (Science.1973; 181:547-549), and tungsten carbide, as a potential catalytic material for replacing Pt group noble metals, has good electrical conductivity (10 5 S cm -1 at 20°C), and has catalytic activity for the electrooxidation reactions of hydrogen, alcohols, formic acid, etc., and its preparation and application research have attracted widespread attention. [0003] Tungsten carbide particles prepared by traditional preparation methods are easy to agglomerate, and the specific surface area (1-35m 2 g -1 ) is low, which is not conducive to the impro...

Claims

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Application Information

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IPC IPC(8): B01J27/22H01M4/92
CPCY02E60/50
Inventor 李光兰谢洋洋陈思妹
Owner DALIAN UNIV OF TECH
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