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A nitrogen oxide degradation film and its preparation method

A technology of nitrogen oxides and degradable membranes, which is applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of reduced current efficiency and low removal efficiency, so as to reduce resistance, improve conversion efficiency, and broaden the Effect of Reaction Temperature Window

Active Publication Date: 2017-12-01
广州爱科琪盛塑料有限公司
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AI Technical Summary

Problems solved by technology

Kammer et al. used gadolinium oxide-doped cerium oxide as a solid electrolyte, and noble metal Pt or Au as an electrode, and carried out NO at 400-600 °C. x removal, but its removal efficiency is low, and the current utilization efficiency needs to be further improved
The invention patent with application number CN201310615694.5 discloses a BaCeO doped with Zr and Y 3 and binary carbonate Na 2 CO 3 , Li 2 CO 3 Mix the prepared inorganic membranes and place them in H 2 NO in the presence of x Its electrocatalytic removal effect is better at 300-500°C, but its current efficiency shows an obvious downward trend with the increase of temperature

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  • A nitrogen oxide degradation film and its preparation method
  • A nitrogen oxide degradation film and its preparation method
  • A nitrogen oxide degradation film and its preparation method

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preparation example Construction

[0034] A preparation method for a nitrogen oxide degradation film, comprising the steps of:

[0035] S100 doped F and N into BaCeO formed by the reaction of cerium acetylacetonate and barium acetylacetonate by sol-gel method 3 In, F, N co-doped BaCeO was prepared 3 powdery solid;

[0036] F and N co-doped BaCeO with corresponding mass ratio treated by S200 ball milling 3 powdery solid and graphene, obtain uniform precursor powder after 12-18 hours at room temperature; and

[0037] In S300, the precursor powder is molded by casting, and the formed sheet is calcined in a nitrogen atmosphere at 500° C. for 5 hours to prepare the nitrogen oxide degradation film, which is used for electrocatalytic degradation of nitrogen oxides.

[0038] Wherein, the step S100 includes the steps of:

[0039] S110 Mix and stir cerium acetylacetonate, barium acetylacetonate, acetylacetone and absolute ethanol in the corresponding molar ratio, add potassium fluoride and melamine in the correspondi...

Embodiment 1

[0050] According to the stoichiometric ratio of n(Ba):n(Ce):n(F):n(N)=1:1:0.15:0.02, 0.05mol cerium acetylacetonate, 0.05mol barium acetylacetonate, 0.5mol acetylacetonate Acetone and 0.2mol absolute ethanol were mixed and stirred, and then stoichiometric potassium fluoride and melamine were added to it, stirred at a speed of 250rmp at room temperature for 60min, then converted into a sol, and treated in a water bath at 50°C for 24h to obtain a gel . The obtained gel was first calcined at 200°C for 5h, then heated up to 1000°C at a rate of 2°C / min and kept for 5h, then lowered to room temperature to obtain a powdery solid. The obtained powdery solid and graphene were ball milled at room temperature for 12 hours at a mass ratio of 4:1 to obtain a uniform powder, which was the precursor powder. The obtained precursor powder was cast into a mold, and it was baked at 500° C. for 5 hours under a nitrogen atmosphere to obtain a nitrogen oxide degradation film, wherein the thickness...

Embodiment 2

[0052] According to the stoichiometric ratio of n(Ba):n(Ce):n(F):n(N)=1:1:0.05:0.08, 0.015mol cerium acetylacetonate, 0.015mol barium acetylacetonate, 0.09mol acetylacetonate Mix and stir acetone and 0.03mol absolute ethanol, then add potassium fluoride and melamine in a stoichiometric ratio to it, stir at a speed of 500rmp at room temperature for 30min, then convert it into a sol, and treat it in a water bath at 65°C for 18h to obtain a gel . The obtained gel was first calcined at 200°C for 5h, then heated up to 1000°C at a rate of 5°C / min and kept for 5h, then lowered to room temperature to obtain a powdery solid. The obtained powdery solid and graphene were ball milled at room temperature for 15 hours at a mass ratio of 4:0.5 to obtain a uniform powder, which was the precursor powder. The obtained precursor powder was molded into a mold, and baked at 500° C. for 5 h in a nitrogen atmosphere to obtain a nitrogen oxide degradation film, wherein the thickness of the nitrogen ...

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Abstract

The invention provides a nitrogen oxide degrading film and a preparation method thereof. The degrading film comprises the following main raw materials: cerium acetylacetone, barium acetylacetone, potassium fluoride, melamine and graphene. The preparation method comprises the following steps: preparing F-and-N codoped BaCeO3 from cerium acetylacetone, barium acetylacetone, potassium fluoride and melamine by using a sol-gel process; mixing graphene with the F-and-N codoped BaCeO3 to obtain precursor powder; and carrying out pouring and film forming so as to obtain the nitrogen oxide degrading film. Thus, the nonmetal-modified inorganic degrading film prepared by using the sol-gel process has a more efficient and stable current utilization rate and is applicable to high-selectivity electrocatalytic degradation of nitrogen oxide.

Description

technical field [0001] The invention relates to the field of inorganic membranes, in particular to an inorganic membrane with high selectivity for electrocatalytic degradation of nitrogen oxides and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in today's air pollution, which will cause major environmental problems such as photochemical smog, acid rain, greenhouse effect and ozone layer destruction, and has biological respiratory toxicity, causing great harm to the ecological environment and human health. NO x It mainly comes from the combustion of fossil fuels such as coal and petroleum and the production of nitric acid. At the same time, with the rapid increase in the number of motor vehicles in my country, the NO produced by vehicle exhaust emissions x The share of emissions is increasing, so its purification treatment is my country's NO x A very critical step in total emission control. [0003] Degra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/56
CPCB01D53/8628B01D2255/2042B01D2255/2065B01D2255/65B01D2255/70B01D2255/806B01J27/24B01J35/065
Inventor 饶琳
Owner 广州爱科琪盛塑料有限公司
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