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Method for preparing non-noble metal tungsten carbide photocatalyst by hydrothermal method

A non-precious metal and photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of disordered product appearance, incomplete agglomeration and reaction, irregular particle size, etc. Achieve the effect of controllable shape, uniform particle size and perfect crystal

Active Publication Date: 2020-07-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional tungsten carbide preparation process needs to be improved, the product appearance is chaotic, the particle size is irregular, the dispersion is uneven, and agglomeration and incomplete reaction are prone to occur, which has a great impact on the performance of the product.

Method used

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  • Method for preparing non-noble metal tungsten carbide photocatalyst by hydrothermal method
  • Method for preparing non-noble metal tungsten carbide photocatalyst by hydrothermal method
  • Method for preparing non-noble metal tungsten carbide photocatalyst by hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 1.3g of sodium tungstate and 1.0g of ammonium sulfate in 30mL of deionized water, mix them evenly and dissolve them fully, use 3M HCl solution to adjust the pH=2, add the obtained clear mixed liquid into 50mL of polytetrafluoroethylene to react The reaction kettle was placed in an oven at 180°C for hydrothermal reaction for 8 hours, then cooled to room temperature naturally, and the product was centrifuged, washed and dried to obtain a tungsten trioxide precursor;

[0027] Put 0.15g of tungsten trioxide precursor and 0.9g of glucose in 30mL of deionized water and mix evenly, then add it into a 50mL polytetrafluoroethylene reactor, put the reactor in a 180°C oven for hydrothermal reaction for 8 hours, and then Cool naturally to room temperature, and centrifuge, wash, and dry the product to obtain a carbon-coated tungsten trioxide precursor;

[0028] Put the carbon-coated tungsten trioxide precursor into the heat treatment equipment, fill it with argon, program the ...

Embodiment 2

[0032] In this example, the non-noble metal tungsten carbide photocatalyst was prepared according to the same method as in Example 1, except that the amount of glucose was changed to 0.45 g. The resulting target product is labeled as T2.

[0033] figure 1 Scanning electron micrograph of the target product tungsten carbide, figure 2 is the X-ray diffraction spectrum of the target product. from figure 1 It can be seen that the prepared tungsten carbide catalyst has a long rod-shaped structure with good dispersion, and its average length is about 600nm. from figure 2 It can be clearly seen that there are three strongest diffraction peaks at 2θ of 31.480, 35.760 and 48.400, corresponding to the (001), (100) and (101) crystal planes of WC (JCPDS: 51-0939) ; In addition, there are several relatively weak diffraction peaks, whose 2θ values ​​are 64.040, 65.320, 73.200, 75.600 and 76.920, which are respectively WC crystal planes (110), (002), (111), (200) and ( 102) (JCPDS: 51...

Embodiment 3

[0036] In this example, the non-noble metal tungsten carbide photocatalyst was prepared according to the same method as in Example 1, except that the amount of glucose was changed to 0.225 g. The resulting target product was labeled as T3.

[0037] The morphology of the sample obtained in this example is similar to that of Example 2, with uniform particle size, excellent appearance and good performance.

[0038] The T3 sample was used in the photocatalytic water splitting hydrogen production reaction according to the same method as in Example 1, and the noble metal Pt was used as the photocatalyst for comparison to test its catalytic performance. After testing, the hydrogen production of the T3 sample is as follows image 3 As shown, the calculated hydrogen production rate of the T3 sample is 1299 μmol / h, which is higher than that of the noble metal-based photocatalyst (about 323 μmol / h).

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Abstract

The invention discloses a method for preparing a non-precious metal tungsten carbide photocatalyst by utilizing a hydrothermal process. The method comprises the following steps: taking tungstate and ammonium sulfate as raw materials, and carrying out hydrothermal reaction, so that a linear tungsten trioxide precursor is obtained; then taking tungsten trioxide and glucose as raw materials, carrying out hydrothermal reaction, and carrying out roasting treatment on the obtained product in presence of a protecting gas, so that the non-precious metal tungsten carbide photocatalyst is obtained. The preparation method disclosed by the invention has the characteristics of simple technology, safety, less environmental pollution and high efficiency, the prepared tungsten carbide photocatalyst is nanoscale in size and has the characteristics that cost is low, stability is good, utilization ratio is high, service life is long and photocatalytic performance is higher than that of a precious metal-based photocatalyst, and commercialization can be easily realized.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, in particular to a method for preparing non-noble metal tungsten carbide photocatalyst. Background technique [0002] As global energy issues and environmental issues become more and more prominent, it is becoming more and more urgent to find a way to use clean, convenient, recyclable and efficient energy sources, such as using solar energy. Noble metal photocatalysts such as gold (Au), platinum (Pt) and palladium (Pd) are widely used in the field of photocatalysis, such as photocatalytic water splitting to produce hydrogen, photocatalytic CO 2 reduction, photocatalytic degradation, photocatalytic oxidation, etc. These noble metal photocatalysts exhibit high photocatalytic activity, but are expensive and unsuitable for large-scale industrial applications. In recent years, non-noble metal tungsten carbide (WC) photocatalysts have been used in photocatalytic water splitting for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22
CPCB01J27/22B01J35/004
Inventor 潘云翔左锐孙正庆
Owner HEFEI UNIV OF TECH
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