Method for synthesizing nitric acid

A synthesis method and technology of nitric acid, applied in the science and engineering fields of nanomaterials and energy environment, can solve the problems of low utilization rate of specific surface atoms and unspecified specific uses, etc.

Active Publication Date: 2018-07-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent publication number is CN1600424A, and the patent name is photocatalyst with visible light response and its preparation method and application. It discloses the preparation of a series of photocatalysts, but does not specify its specific use
But under general conditions, WO 3 It is mainly a bulk structure, and its specific surface atom utilization rate is not high. How to ensure WO 3 Improving the utilization efficiency of materials while maintaining intrinsic properties is also a very important issue.
At present, there is no report on the direct catalytic synthesis of nitric acid by tungsten oxide under mild conditions, using nitrogen molecules as nitrogen source

Method used

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preparation example Construction

[0030] The embodiment of the invention discloses a kind of synthetic method of nitric acid, comprising:

[0031] Will Fu Pit WO 3 The nanosheet material is mixed with water, a mixed gas of nitrogen and oxygen is passed into the obtained water phase, and a photocatalytic reaction is carried out under light conditions to obtain nitric acid.

[0032] The synthetic method of nitric acid provided by the application is to enrich pit WO 3 Nanosheet materials as photocatalysts due to pit-rich WO 3 The nanosheet material has a special morphology, which provides active sites for photocatalytic nitrogen fixation, and ultimately improves the reactivity, and the method is simple, mild, and easy for large-scale production.

[0033] In the process of synthesizing nitric acid, the photocatalyst that this application adopts is rich pit WO 3 Nanosheet material, the material has unique pits rich in unsaturated bonds, the size and aperture of the pits are 1-4nm, the sheet size is 200-500nm, the ...

Embodiment 1

[0052] Accurately weigh 0.4g of analytically pure sodium tungstate dihydrate, add it to 300ml of 4.8mol / L nitric acid, stir at 20°C for 72h; centrifuge the obtained light yellow suspension, and then wash it with distilled water Wash 5 times; the product obtained was dried overnight at room temperature, and the sample obtained at this time was WO 3 2H 2 O; Accurately weigh 10mg WO 3 2H 2 O was dispersed in 10ml of distilled water, then sonicated in an ice-water bath for 3h, and then the light yellow suspension was centrifuged at 5000rmp for 10min, and then the supernatant was carefully sucked up with a pipette, and the sucked supernatant was centrifuged at 14000rmp for 15min , get WO 3 2H 2 O ultrathin; WO will be obtained 3 2H 2 O ultrathin slices were dried overnight at room temperature, and finally the WO 3 2H 2 O ultrathin flakes were topologically transformed at 400°C for 30 minutes, and the yellow-green powder was taken out after cooling, which was the target WO ...

Embodiment 2

[0056] Accurately weigh 0.4g of analytically pure sodium tungstate dihydrate, add it to 300ml of 4.8mol / L nitric acid, stir at 20°C for 72h; centrifuge the obtained light yellow suspension, and then wash it with distilled water Wash 5 times; the product obtained was dried overnight at room temperature, and the sample obtained at this time was WO 3 2H 2 O; Accurately weigh 20mg WO 3 2H 2 O was dispersed in 100ml of distilled water, then ultrasonicated in an ice-water bath for 5h, and then the light yellow suspension was centrifuged at 5000rmp for 10min, and then the supernatant was carefully sucked up with a pipette, and the sucked supernatant was centrifuged at 14000rmp for 15min , get WO 3 2H 2 O ultrathin; WO will be obtained 3 2H 2 O ultrathin slices were dried overnight at room temperature, and finally the WO 3 2H 2 O ultrathin flakes were topologically transformed at 400°C for 30 minutes, and the yellow-green powder was taken out after cooling, which was the targe...

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Abstract

The invention provides a method for synthesizing nitric acid, and the method is as follows: mixing a pit-rich WO3 nanosheet material with water, introducing a mixed gas of nitrogen and oxygen into anobtained water phase, and performing a photocatalytic reaction under illumination conditions to obtain the nitric acid. The pit-rich WO3 nanosheet material is used as a catalyst for synthesizing of the nitric acid by photocatalytic conversion with nitrogen molecules as a nitrogen source. Due to the unique rich pit structure of the pit-rich WO3 nanosheet material, the pit-rich WO3 nanosheet material has high catalytic activity as the catalyst, and finally makes N2 reaction activity high. Experimental results show that the average rate of the catalyst per gram for catalytic synthesis of the nitric acid is 1.22 mg.g<-1>.h<-1>.

Description

technical field [0001] The invention relates to the field of science and engineering technology of nanomaterials and energy environment, in particular to a method for synthesizing nitric acid. Background technique [0002] Nitrogen is one of the basic elements that make up living organisms (proteins, DNA, and nucleic acids), and is also the core element for the survival of all organisms. In addition, the derivatives of nitrogen such as nitrate, nitrogen-based fertilizers and nitrogen-based explosives are closely related to national production, industrial agriculture, military industry and national defense. However, nitrogen in nature basically exists in the form of nitrogen gas and cannot be directly utilized. But since N 2 It is very stable, and its bond energy is as high as 942KJ / mol, which makes it extremely difficult to break the nitrogen-nitrogen triple bond and convert free nitrogen into combined nitrogen (such as nitrated nitrogen or ammoniated nitrogen) by chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/38C01G41/02B01J23/30
CPCB01J23/30C01B21/38C01G41/02C01P2002/72C01P2004/04C01P2004/20C01P2004/62
Inventor 肖翀刘友文谢毅
Owner UNIV OF SCI & TECH OF CHINA
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