Construction method and application of Pickering microbubble system for photocatalytic nitrogen fixation ammonia synthesis

A construction method and a technology for synthesizing ammonia are applied in the field of Pickering microbubble system construction of photocatalytic nitrogen fixation to synthesize ammonia, which can solve the problems of low reduction efficiency and poor selectivity of target products, and achieve the effects of solving contact difficulties, improving nitrogen fixation efficiency, and speeding up the reaction rate.

Active Publication Date: 2020-09-25
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the photocatalytic N of the aqueous solution system in the prior art 2 The problem of low reduction efficiency and poor selectivity of the target product, the present invention provides

Method used

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  • Construction method and application of Pickering microbubble system for photocatalytic nitrogen fixation ammonia synthesis
  • Construction method and application of Pickering microbubble system for photocatalytic nitrogen fixation ammonia synthesis
  • Construction method and application of Pickering microbubble system for photocatalytic nitrogen fixation ammonia synthesis

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Embodiment 1

[0032] According to attached figure 1 The method shown to prepare the amphiphilic Pickering photocatalyst: the porous SiO 2 Surface hydroxylation of microspheres to obtain hydrophilic SiO 2 (see attached figure 2 , whose gas / liquid / solid three-phase contact angle is 24°), and then undergoes regional modification by hydrophobic aminosilicon ester to become amphiphilic SiO 2 carrier (see attached image 3 , and its gas / liquid / solid three-phase contact angle is 93°); the metal photocatalyst Pt was supported on the amphiphilic SiO by photoreduction method 2 carrier to obtain amphiphilic Pickering photocatalyst.

[0033] Construction of the Pickering microbubble system: Weigh 1.5 g of amphiphilic Pickering photocatalyst, add it to a closed light-transmitting reactor containing 40 mL of deionized water, and fill it with N 2 gas and maintain the system pressure at 0.5MPa, and magnetically stir at 1000rpm for 10min to form water-packed N 2 Type Pickering microbubble system (see...

Embodiment 2

[0035] Preparation of amphiphilic Pickering photocatalysts: Surface introduction of porous carbon materials-N + (CH 3 ) 3 Cl - The group is treated with hydrophilicity, and then regulated by hydrophobic silane to obtain an amphiphilic carrier with a gas / liquid / solid three-phase contact angle of 89°; the TiO 2 The photocatalyst is loaded on the amphiphilic carrier to obtain the amphiphilic Pickering photocatalyst.

[0036] Construction of the Pickering microbubble system: Weigh 1.5 g of amphiphilic Pickering photocatalyst, add it to a closed light-transmitting reactor containing 50 mL of deionized water, and fill it with N 2 gas and maintain the system pressure at 0.2MPa, and magnetically stir at 900rpm for 15min to form water-packed N 2 Type Pickering microbubble system.

Embodiment 3

[0038] Preparation of amphiphilic Pickering photocatalyst: introduce -COOH and -OH groups on the surface of graphene for hydrophilic treatment, and then use hydrophobic silicone grease to control, and obtain an amphiphile with a gas / liquid / solid three-phase contact angle of 89° sex carrier; protonated g-C by electrostatic self-assembly 3 N 4 The photocatalyst is loaded on the amphiphilic carrier to obtain the amphiphilic Pickering photocatalyst.

[0039] Construction of Pickering microbubble system: Weigh 1.8g amphiphilic Pickering photocatalyst, add it to a closed light-transmitting reactor containing 60mL deionized water, and fill it with N 2 gas and maintain the system pressure at 0.25MPa, and magnetically stir at 1000rpm for 20min to form N in water 2 Type Pickering microbubble system.

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Abstract

The invention belongs to the field of photocatalytic nitrogen fixation synthesis ammonia, and particularly relates to a construction method and application of a Pickering microbubble system for photocatalytic nitrogen fixation ammonia synthesis. The Pickering microbubble system disclosed by the invention is an N2-in-water microbubble system formed by taking an amphiphilic Pickering solid photocatalyst as an emulsifier and spontaneously assembling the amphiphilic Pickering solid photocatalyst on a gas-water interface. When the system is used for photocatalytic nitrogen fixation ammonia synthesis reaction, the nitrogen fixation efficiency can be improved by 5-40% in comparison with that of the traditional gas-liquid two-phase reaction, and the selectivity of ammonia can be improved by 10-50%.

Description

technical field [0001] The invention belongs to the field of photocatalytic nitrogen fixation and synthesis of ammonia, in particular to a construction method and application of a Pickering microbubble system for photocatalytic nitrogen fixation and synthesis of ammonia. Background technique [0002] Ammonia is an important basic chemical raw material in the fields of fertilizer production and fiber manufacturing, as well as a potential energy carrier. At present, industrial ammonia synthesis needs to be carried out under the conditions of high temperature (500°C) and high pressure (20-50MPa). This process consumes a lot of energy, costs high, causes serious pollution and is dangerous. Therefore, there is an urgent need to find a green, clean and sustainable ammonia synthesis method, especially to find a method for using renewable energy to synthesize ammonia in a natural environment. In recent years, photocatalytic nitrogen fixation technology has received widespread atten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/04B01J23/42B01J31/02B01J27/24B01J27/051
CPCC01C1/04B01J35/004B01J23/42B01J31/0274B01J31/0275B01J27/24B01J27/0515Y02P20/52
Inventor 杨恒权刘宪薛楠
Owner SHANXI UNIV
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