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Hollow core-shell structure catalyst for catalytic oxidation of nitrogen oxide and preparation method of hollow core-shell structure catalyst

A technology of core-shell structure and nitrogen oxides, which is applied in the field of air pollution control, and achieves the effects of good stability, simple preparation method and prolonged service life

Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a hollow core-shell structure catalyst for catalyzing the oxidation of nitrogen oxides and its preparation method, which is used to solve the problem that the catalyst in the prior art should have low temperature and high activity. , strong anti-poisoning ability and high stability

Method used

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  • Hollow core-shell structure catalyst for catalytic oxidation of nitrogen oxide and preparation method of hollow core-shell structure catalyst
  • Hollow core-shell structure catalyst for catalytic oxidation of nitrogen oxide and preparation method of hollow core-shell structure catalyst
  • Hollow core-shell structure catalyst for catalytic oxidation of nitrogen oxide and preparation method of hollow core-shell structure catalyst

Examples

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Embodiment 1

[0039] Example 1 Synthesis of hollow core-shell structure γ-MnO by hard template ~ hydrothermal method 2 @ZrO 2 catalyst

[0040] 0.5 g particles of 350 nm SiO 2 The powder is dispersed in a mixed solution of deionized water and ethanol for 15 minutes to obtain a white mixed solution, manganese nitrate is added to the white mixed solution, stirred at room temperature for 1 hour, and then the potassium permanganate solution (the quality of potassium permanganate is 0.2 g) was injected into the above mixed solution at a certain rate to obtain a suspension, and the suspension was stirred for 6 hours in a water bath at a temperature of 35°C, centrifuged, washed and dried to obtain a black solid, and the white solid was heated at a temperature of 300 Calcined at ℃ for 4h to obtain SiO 2 @γ-MnO 2 ; 2.2g zirconium oxynitrate and 0.2g cetyltrimethylammonium bromide are dissolved in water and ethanol mixed solution, then add the obtained SiO 2 @γ-MnO 2 After ultrasonic dispersion...

Embodiment 2

[0045] Example 2 Synthesis of hollow core-shell structure γ-MnO by hard template ~ hydrothermal method 2 @CeO 2 catalyst

[0046] The ammonium cerium nitrate in embodiment 1 is replaced by zirconium oxynitrate, cetyltrimethylammonium bromide is replaced by polyvinylpyrrolidone, the particle size of silicon dioxide is 250nm, manganese nitrate: potassium permanganate: cerium nitrate The mass ratio of ammonium: polyvinylpyrrolidone is 0.5: 0.36: 0.2: 2.5: 0.15, and the hollow core-shell structure γ-MnO is prepared according to the same method as in Example 1 2 @ZrO 2 sample.

[0047] According to powder X-ray diffraction pattern and transmission electron microscope analysis, the powder is mainly hollow core-shell structure γ-MnO 2 @CeO 2 catalyst. Investigated the change of the conversion rate of this catalyst action nitric oxide with temperature and anti-sulfur performance ( Image 6 ), the results show that the catalyst has excellent water and sulfur resistance and stabi...

Embodiment 3

[0048] Example 3 Synthesis of hollow core-shell structure γ-MnO by hard template ~ hydrothermal method 2 @La 2 o 3 catalyst

[0049] Lanthanum nitrate in Example 1 is replaced by zirconyl nitrate, polyethylene glycol is replaced by polyvinylpyrrolidone, the particle size of silicon dioxide is 450nm, silicon dioxide: manganese nitrate: potassium permanganate: lanthanum nitrate: polyethylene The mass ratio of diol is 0.75:0.36:0.2:2.8:0.25, and the hollow core-shell structure γ-MnO is prepared according to the same method as in Example 1 2 @La 2 o 3 sample.

[0050] According to powder X-ray diffraction pattern and transmission electron microscope analysis, the powder is mainly hollow core-shell structure γ-MnO 2 @La 2 o 3 catalyst. The same method as in Example 1 was used to repeatedly measure the change of the conversion rate of nitric oxide under the action of the catalyst as a function of temperature, and the results showed that the catalyst had excellent water and ...

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Abstract

The invention discloses a hollow core-shell structure catalyst for catalytic oxidation of nitrogen oxide and a preparation method of the hollow core-shell structure catalyst. The catalyst is a gamma-MnO2@MOx catalyst with a hollow core-shell structure, which is obtained by taking gamma-MnO2 of a hollow structure as a catalyst core and coating a mesoporous structure metal oxide MOx shell with a certain mass fraction on the catalyst core. The invention also discloses a preparation method of the catalyst. The hollow core-shell structure catalyst obtained by the method has the multi-functional advantages of high activity at low temperature, strong poisoning resistance and good stability, and has the advantages of simple preparation process, low raw material cost and good industrial applicationprospect.

Description

technical field [0001] The invention belongs to the field of air pollutant control, and more specifically relates to a hollow core-shell structure catalyst for catalyzing the oxidation of nitrogen oxides and a preparation method thereof. Background technique [0002] According to the statistics of the Ministry of Environmental Protection, there are about 620,000 coal-fired industrial boilers in China, accounting for about 85% of the total boilers, with an annual coal consumption of more than 700 million tons, of which nitrogen oxides (NO x ) emission accounts for 15%, which is one of the main causes of haze weather, which has extremely bad effects on human survival and the ecological environment, and has aroused great concern from the government and the public. In 2019, the National Environmental Protection Agency issued the "Emission Standards of Air Pollutants for Boilers", which stipulates the emission limits of air pollutants for coal-fired industrial boilers. In order ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J37/10B01J35/10B01D53/86B01D53/56
CPCB01J23/34B01J37/10B01J23/002B01J37/0018B01D53/8628B01D2258/0283B01J35/397B01J35/615B01J35/638B01J35/647
Inventor 陈磊张早校张武元余云松张锦萍张辰吴小梅刘辉
Owner XI AN JIAOTONG UNIV
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