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Pt-supported tungsten carbide catalyst and preparation method thereof

A technology of platinum catalyst and tungsten carbide, which is applied in the field of preparation of tungsten carbide-supported platinum catalyst, can solve the problems that have not yet been seen in literature and application reports, and achieve the effect of simple process and simple process control

Inactive Publication Date: 2007-07-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mesoporous structure tungsten carbide-loaded nano-platinum catalyst and its preparation method proposed by the present invention have not yet been seen in literature and application reports

Method used

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  • Pt-supported tungsten carbide catalyst and preparation method thereof
  • Pt-supported tungsten carbide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ammonium metatungstate (AMT, (NH 4 ) 2 W 4 o 13 ·5H 2 O) and chloroplatinic acid (H 2 PtCl 6 ) is mixed in distilled water according to the mass ratio of raw materials of 1:0.23, and is prepared into a mixed aqueous solution, wherein the mass concentration of ammonium metatungstate in the solution is 5wt%, and is ultrasonically oscillated at room temperature for 30 minutes, and then stirred by a magnetic stirrer The solution was introduced into a spray dryer for spray drying to obtain hollow spherical H 2 WO 3 / Chloroplatinic acid microsphere particle precursor; put the granulated and dried precursor into a quartz boat and place it in a tubular resistance furnace, inject hydrogen at 400°C, perform a 2-hour roasting heat treatment, and then raise the temperature To 900°C, the mixed gas of methane and hydrogen is introduced for reduction carbonization, the mass ratio of methane and hydrogen mixture is 20:1, the gas flow rate is 0.45m / S, and the reduction carbonizat...

Embodiment 2

[0035] Dissolve ammonium metatungstate in water, prepare a 5wt% solution, and use ultrasonic vibration for 30 minutes under a stable room; while stirring with a magnetic stirrer, introduce the solution into a spray dryer for spray drying to obtain hollow spherical H 2 WO3 Precursor of microsphere particles; put the dried precursor into a quartz boat and place it in a tubular resistance furnace, pass hydrogen gas at 400°C for 2 hours of roasting heat treatment, then raise the temperature to 900°C, and pass in methane , Hydrogen mixed gas for reductive carbonization, the mass ratio of methane and hydrogen mixed is 20:1, the gas flow rate is 0.45m / S, and the reductive carbonization time is 12 hours. After the reaction, the product was cooled to room temperature with the furnace to obtain a tungsten carbide powder sample. The prepared tungsten carbide carrier was analyzed by scanning electron microscope. It can be seen from Fig. 4 that the obtained tungsten carbide carrier is holl...

Embodiment 3

[0037] The tungsten carbide-supported platinum catalyst prepared in Example 1 was prepared into a powder microelectrode, and the hydrogen evolution catalytic activity of the tungsten carbide-supported platinum powder microelectrode was tested by cyclic voltammetry. The results are shown in the curve in Figure 5c. The instrument used is a microcomputer-controlled CHI660B electrochemical analyzer. The experiment uses a three-electrode test system, and the electrolyte is H 2 SO 4 (1mol / L), the reference electrode is a saturated calomel electrode, the counter electrode is a Pt sheet, the experimental temperature is 25°C, and the scanning speed is 0.1V / S.

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Abstract

The invention relates to a carbon tungsten catalyst and relative production, wherein said catalyst is powder particles with hollow structure. The production comprises that: dissolving ammonium metatungstate and platinum salt at 1:0.02-2 into distilled water, to prepare the mixture solution whose ammonium metatungstate content is 2. 5-50wt%; leading said solution into atomization drier to be atomized and dried to obtain the forward element of hollow H2WO3 / platinum salt; reducing and carbonizing the forward element; with inertia gas, cooling the product into room temperature, to obtain the final catalyst. The invention has simple process while the Pt / WC catalyst can be used in fuel battery with wide application.

Description

(1) Technical field [0001] The invention relates to a tungsten carbide supported platinum catalyst and a preparation method of the tungsten carbide supported platinum catalyst. (2) Technical background [0002] Energy and the environment are the most important issues involved in the sustainable development of human society. Hydrogen is one of the ideal clean energy sources, and it is also an important chemical raw material, which is widely valued by countries all over the world. The electrocatalytic hydrogen evolution reaction is an effective way to convert electrical energy into chemical energy, and the reduction of cathodic hydrogen evolution overpotential is the key to improving hydrogen evolution activity and reducing electrolysis energy consumption. Among the existing materials, platinum group elements have excellent electrocatalytic activity and low hydrogen overpotential, but they are expensive; nickel and its alloys are also commonly used as hydrogen evolution mater...

Claims

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Application Information

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IPC IPC(8): B01J23/652B01J21/18H01M4/92
CPCY02E60/50
Inventor 马淳安盛江峰
Owner ZHEJIANG UNIV OF TECH
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