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Spherical C/FeMo nano-composite photocatalyst and preparation method thereof

A nano-photocatalyst and nano-composite technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of complex synthesis and low photocatalytic performance, Achieve high photocatalytic activity, increase reaction rate, and mild preparation conditions

Active Publication Date: 2021-09-17
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems that the photogenerated electron-hole pairs of photocatalysts in the prior art are easy to recombine, the photocatalytic performance is low, and the synthesis is relatively complicated, the present invention provides a spherical C with good adsorption performance and excellent photocatalytic performance. / FeMo nanocomposite photocatalyst, which effectively improves the absorption of light and the transfer of photoexcited holes-electrons, improves the catalytic effect and reduces the energy consumption required for ammonia synthesis, and the porous structure can enhance the adsorption capacity of nitrogen and increase the reaction rate

Method used

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  • Spherical C/FeMo nano-composite photocatalyst and preparation method thereof
  • Spherical C/FeMo nano-composite photocatalyst and preparation method thereof
  • Spherical C/FeMo nano-composite photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] (a) Preparation of spherical C / FeMo nanocomposite photocatalyst precursor:

[0034] 1. Take 20mL deionized water in a beaker for later use;

[0035] 2. Take 0.38g nitrilotriacetic acid and 0.27g MoCl 5 The powder is dispersed into the above beaker, and then 0.2g FeCl is added 2 4H 2 O, stir magnetically at room temperature for 10 minutes, add 20 mL of isopropanol, and stir magnetically at room temperature for 30 minutes. After stirring evenly, move it to an autoclave, put it into an oven, and control the reaction temperature at 180° C. for 6 hours;

[0036] 3. Use a high-speed centrifuge to centrifuge the reacted product at a speed of 4000rpm to take the precipitate, then wash the precipitate repeatedly with water until it is neutral, and then wash it with absolute ethanol for 3 times;

[0037] 4. Place the washed precipitate in a vacuum oven and dry at 60°C for 12 hours to obtain the precursor;

[0038] (b) Preparation of spherical C / FeMo nanocomposite photocatalys...

Embodiment 2

[0042] (a) Preparation of spherical C / FeMo nanocomposite photocatalyst precursor:

[0043]1. Take 20mL deionized water in a beaker for later use;

[0044] 2. Take 0.19g nitrilotriacetic acid and 0.27g MoCl 5 The powder was dispersed into the above beaker, and then 0.18g Fe(NO 3 ) 2 , stirred magnetically at room temperature for 10 minutes, added 20 mL of isopropanol, and stirred magnetically at room temperature for 30 minutes. After stirring evenly, move it to an autoclave, put it in an oven, and control the reaction temperature at 180°C for 6 hours;

[0045] 3. Use a high-speed centrifuge to centrifuge the reacted product at a speed of 4000rpm to take the precipitate, then wash the precipitate repeatedly with water until it is neutral, and then wash it with absolute ethanol for 3 times;

[0046] 4. Place the washed precipitate in a vacuum oven and dry at 60°C for 12 hours to obtain the precursor;

[0047] (b) Preparation of spherical C / FeMo nanocomposite photocatalyst: th...

Embodiment 3

[0049] (a) Preparation of spherical C / FeMo nanocomposite photocatalyst precursor:

[0050] 1. Take 18mL deionized water in a beaker for later use;

[0051] 2. Take 0.1g nitrilotriacetic acid, 0.27g MoCl 5 The powder is dispersed into the above beaker, and then 0.2g FeCl is added 2 4H 2 O, stir magnetically at room temperature for 10 minutes, add 18 mL of isopropanol, stir magnetically at room temperature for 30 minutes, move it to an autoclave after stirring evenly, put it into an oven, and control the reaction temperature at 150 ° C for 7 hours;

[0052] 3. Use a high-speed centrifuge to centrifuge the reacted product at a speed of 4000rpm to take the precipitate, then wash the precipitate repeatedly with water until it is neutral, and then wash it with absolute ethanol for 3 times;

[0053] 4. Place the washed precipitate in a vacuum oven and dry at 60°C for 12 hours to obtain the precursor;

[0054] (b) Preparation of spherical C / FeMo nanocomposite photocatalyst: the pr...

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Abstract

The invention relates to the technical field of catalysts, and discloses a spherical C / FeMo nano-composite photocatalyst and a preparation method thereof so as to solve the problems that in the prior art, photo-induced electron-hole pairs are easy to compound, the photocatalytic performance is low, and synthesis is complex. The spherical C / FeMo nano-composite photocatalyst comprises an iron-molybdenum compound and carbon loaded on the surface of the iron-molybdenum compound, and the nanocatalyst is spherical and porous. The preparation method comprises the following steps: (a) preparing a spherical C / FeMo nano-composite material precursor; and (b) performing sintering preparation on the spherical C / FeMo nano-composite photocatalyst. The nano-composite photocatalyst has relatively high photocatalytic activity, and can effectively inhibit the compounding of photo-induced electron-hole pairs so as to remarkably improve the utilization efficiency of visible light, so that a synthesis ammonia reaction can be carried out at room temperature and under the irradiation of the visible light; the porous spherical structure increases the specific surface area and enhances the adsorbability to nitrogen, and the reaction rate can be increased; and the preparation conditions are mild, the preparation purity is good, and the spherical C / FeMo nano-composite photocatalyst is suitable for industrial large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a spherical C / FeMo nanocomposite photocatalyst and a preparation method thereof. Background technique [0002] With the development of industry and agriculture, ammonia has become an important chemical substance used in the synthesis of fertilizers and chemicals in agriculture and industry. The current industrial synthesis of ammonia is still dominated by the Haber-Bosch method using iron-based catalysts. 2 The N≡N triple bond of the molecule has a superhigh bond energy (940.95kJmol -1 ), making it difficult for conventional catalytic materials to reduce N 2 Molecules, so the reaction conditions of the Haber-Bosch method are harsh and consume a lot of energy. The energy consumed by it accounts for more than 1% of the global energy, which has caused a great burden on the environment. Solar energy is a clean energy, and the photocatalytic pathway can directly convert solar ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/881B01J35/10C01C1/04
CPCB01J23/881C01C1/0411B01J35/39B01J35/60Y02P20/52
Inventor 高鹏邓苹
Owner HANGZHOU NORMAL UNIVERSITY