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Photocatalytic material capable of being used for reducing nitrogen to produce ammonia as well as preparation method and application of photocatalytic material

A photocatalytic material, nitrogen technology, applied in the preparation/separation of ammonia, chemical instruments and methods, ammonia compounds, etc., can solve the problems of rarely having absorption properties in the infrared spectral region, low solar energy utilization, and high proportion of precious metals, reaching Excellent photocatalytic reduction of nitrogen to produce ammonia, high solar energy utilization, and low proportion of precious metals

Active Publication Date: 2021-06-08
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current catalyst materials for photocatalytic nitrogen fixation rarely have the absorption properties in the infrared spectral region, so that a large amount of sunlight in the infrared spectral region is wasted.
low solar utilization
However, in the existing materials with absorption properties in the infrared spectral region, the proportion of noble metals in the catalyst is very high, and the cost is expensive.
[0006] Second, the yield of photocatalytic reduction of nitrogen to ammonia is low
However, this approach increases the cost of the reaction

Method used

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  • Photocatalytic material capable of being used for reducing nitrogen to produce ammonia as well as preparation method and application of photocatalytic material
  • Photocatalytic material capable of being used for reducing nitrogen to produce ammonia as well as preparation method and application of photocatalytic material
  • Photocatalytic material capable of being used for reducing nitrogen to produce ammonia as well as preparation method and application of photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Pd@CeO for Photocatalytic Reduction of Nitrogen to Ammonia 2 Nanomaterials, which are composed of flower-shaped nano-palladium particles and CeO grown on the outer layer 2 layer shell, in which the atomic number ratio of Pd:Ce is about 50:50. The preparation method is as follows:

[0097] (1) Preparation of Pd seeds: prepare 5mL of 0.5mM PdCl 2 aqueous solution and 5mL 2mM CTAB aqueous solution, and inert gas was passed for 30 minutes to remove the dissolved oxygen in the two solutions, and 5mL 0.5mM PdCl after removing the dissolved oxygen 2 Mix the aqueous solution with 5mL 2mM CTAB aqueous solution, and then inject 250μL 15mM NaBH into the mixed solution 4 aqueous solution. A Pd seed solution was prepared.

[0098] (2) Preparation of flower-shaped nano-palladium particles: prepare 610mL of 0.25mM PdCl in No. 1 bottle 2 Aqueous solution, weigh 365mg CTAB in the No. 2 bottle, and then take the prepared PdCl in the No. 1 bottle 2 Add 10mL of the aqueous solution ...

Embodiment 2

[0104] Pd@CeO for Photocatalytic Reduction of Nitrogen to Ammonia 2 Nanomaterials, which are composed of flower-shaped nano-palladium particles and CeO grown on the outer layer 2 layer shell, in which the atomic number ratio of Pd:Ce is about 40:60. The preparation method is as follows:

[0105] (1) Preparation of Pd seeds: prepare 5mL of 0.5mM PdCl 2 aqueous solution and 5mL 2mM CTAB aqueous solution, and inert gas was passed for 30 minutes to remove the dissolved oxygen in the two solutions, and 5mL 0.5mM PdCl after removing the dissolved oxygen 2 Mix the aqueous solution with 5mL 2mM CTAB aqueous solution, and then inject 300μL 15mM NaBH into the mixed solution 4 aqueous solution. A Pd seed solution was prepared.

[0106] (2) Preparation of flower-shaped nano-palladium particles: prepare 610mL of 0.25mM PdCl in No. 1 bottle 2 Aqueous solution, weigh 365mg CTAB in the No. 2 bottle, and then take the prepared PdCl in the No. 1 bottle 2 Add 10 mL of the aqueous solution...

Embodiment 3

[0110] Preparation of Pd@CeO for photocatalytic reduction of nitrogen to produce ammonia in a similar manner to Example 1 2 Nanomaterials, in which flower-shaped nano-palladium particles grow a layer of CeO with a thickness of about 35 nm 2 , the atomic number ratio of Pd and Ce is about 35:65.

[0111]Using the same method as in Example 1, the photocatalytic material Pd@CeO prepared above 2 The photocatalytic ammonia production stability test was carried out, and the efficiency of the photocatalytic material to synthesize ammonia was about 76 μmol g -1 h -1 .

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Abstract

The invention provides a photocatalytic material capable of reducing nitrogen to produce ammonia as well as a preparation method and application of the photocatalytic material. The photocatalytic material capable of being used for reducing nitrogen to produce ammonia, provided by the invention, comprises palladium particles and a CeO2 layer coating the palladium particles. The photocatalytic material has absorption in the wavelength range of 200-1300 nm, has a high solar energy utilization rate in a photocatalytic nitrogen reduction ammonia production reaction, also has rich oxygen vacancies, has strong adsorption capacity to nitrogen, and is beneficial to catalytic reaction, so that the material can show excellent properties of photocatalytic reduction of nitrogen to produce ammonia under visible and near-infrared illumination without adding a hole sacrifice agent into a reaction system at normal temperature and normal pressure, is good in stability and can be repeatedly used for multiple times.

Description

technical field [0001] The invention relates to a photocatalytic material capable of reducing nitrogen to produce ammonia, a preparation method and application thereof. Background technique [0002] Ammonia is not only an important nitrogen source for artificial nitrogen fertilizers, but also an important raw material for chemical industries such as textiles and pharmaceuticals. The current method of industrial ammonia synthesis is mainly the Haber-Bosch method in the 20th century, but this method requires high temperature and high pressure to achieve the dissociation of nitrogen, accompanied by a large amount of greenhouse gas emissions, resulting in a large amount of energy consumption , but also cause environmental pollution. Therefore, it is of great significance to find cheap, efficient, green and energy-saving ammonia synthesis technology. [0003] Currently, ammonia synthesis methods mainly include biological nitrogen fixation, electrochemical catalytic nitrogen fix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/00C01C1/02
CPCB01J23/63C01C1/026B01J35/393B01J35/39B01J35/398Y02P20/52Y02P20/133
Inventor 李华周保范彭亮
Owner LANZHOU UNIVERSITY
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