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WO3-x nanowire, and preparation method and application thereof

A nanowire, wo3-x technology, applied in the field of catalytic material preparation, can solve problems such as harsh catalytic conditions

Inactive Publication Date: 2019-09-13
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Ethanol dehydrogenation is an important acetaldehyde-producing reaction in industry, but some current technologies require metal materials and high temperature and high pressure conditions to achieve high-efficiency conversion, and the catalytic conditions are relatively harsh, which limits its application

Method used

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  • WO3-x nanowire, and preparation method and application thereof
  • WO3-x nanowire, and preparation method and application thereof
  • WO3-x nanowire, and preparation method and application thereof

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preparation example Construction

[0043] The present invention also provides the WO described in the above technical scheme 3-x A method for preparing nanowires, comprising the steps of:

[0044] Mix the tungsten source and absolute ethanol to form a reaction solution;

[0045] The reaction solution is subjected to solvothermal reaction to obtain WO 3-x nanowire; the tungsten source includes tungsten hexacarbonyl or tungsten chloride; the temperature of the solvothermal reaction is 140-180°C, and the time is 12-20h.

[0046] In the present invention, said WO 3-x The parameters of the preparation method of the nanowires are consistent with those described above, and will not be repeated here.

[0047] The preparation method of the present invention is simple to operate, low in cost, and the prepared WO 3-x Nanowires have broad and tunable resonant absorption bands in the near-infrared region.

[0048]The present invention also provides the WO described in the above technical scheme 3-x Application of nano...

Embodiment 1

[0063] Add 50mg of tungsten hexacarbonyl powder into 30mL of deionized water, stir vigorously to form a yellow liquid, then transfer it to a 50mL polytetrafluorohydrothermal kettle, keep it at 160°C for 12h, cool it down to room temperature naturally, and heat it at 8000r / min speed centrifugation for 10min, the resulting solid was washed with absolute ethanol, and dried in a vacuum oven to obtain WO 3-x Nanowires.

[0064] figure 2 For the present embodiment gained WO 3-x Transmission electron microscope image of the nanowires, from figure 2 It can be seen that the obtained WO 3-x The length of the nanowire is 1-3 μm, and the diameter is 5-10 nm.

[0065] image 3 For embodiment 1 gained WO 3-x The absorption spectrum of the nanowire; from image 3 It can be seen that the obtained WO 3-x The nanowires have strong absorption in the visible-near-infrared region, indicating that the obtained WO 3-x Nanowires have a strong plasmonic effect.

[0066] Take 5mg WO 3-x N...

Embodiment 2

[0072] Similar to Example 1, the only difference is that the tungsten source is changed to tungsten chloride.

[0073] Income WO 3-x The acetaldehyde yield of the nanowires was 784.70μmol / (g·h) and the selectivity reached 90.2% under the mixed atmosphere of nitrogen-oxygen (oxygen volume ratio was 0.4%).

[0074] Income WO 3-x The acetaldehyde production of the nanowires was only 24.64 and 206.58 μmol / g within 3 hours under UV or visible light irradiation alone, but the acetaldehyde production reached 2354.09 μmol under UV-visible light.

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Abstract

The invention provides a WO3-x nanowire, and a preparation method and an application thereof, and belongs to the technical field of catalytic material preparation. The preparation method of the WO3-xnanowire comprises the following steps: mixing a tungsten source with anhydrous ethanol to form a reaction solution; and carrying out a solvothermal reaction on the reaction solution at 140-180 DEG Cfor 12-20 h to obtain the WO3-x nanowire. The WO3-x nanowire having a length of 1-3 [mu]m and a diameter of 5-10 nm is obtained in the invention. The WO3-x nanowire has strong absorption in the visible-near infrared region, and has a strong plasma effect; and the WO3-x nanowire can catalyze the dehydrogenation reaction of ethanol at room temperature under ultraviolet light and visible light irradiation conditions. The data of the embodiments show that the yield of acetaldehyde in a nitrogen and oxygen mixed atmosphere (the volume fraction of oxygen is 0.4%) is highest, and reaches 896.67 [mu]mol / (g.h), and the selectivity also reaches 91%.

Description

technical field [0001] The invention relates to the technical field of preparation of catalytic materials, in particular to a WO 3-x Nanowires and their preparation methods and applications. Background technique [0002] The localized surface plasmon effect (LSPR) on the surface of noble metal nanoparticles will enhance the light absorption. However, the LSPR effect can also occur on the surface of some semiconductor particles with high free carrier density. Due to the advantages of simple synthesis method, low price, and strong LSPR effect, semiconductor materials have broad application prospects in the fields of photolysis of water, biotherapy, and solar energy conversion. [0003] Ethanol dehydrogenation is an important acetaldehyde-producing reaction in industry, but some current technologies require metal materials and high temperature and high pressure conditions to achieve high-efficiency conversion, and the catalytic conditions are relatively harsh, which limits it...

Claims

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Application Information

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IPC IPC(8): B01J23/30C07C45/29C07C47/06
CPCB01J23/30C07C45/29B01J35/39C07C47/06
Inventor 娄在祝卢长海李娟
Owner JINAN UNIVERSITY
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