Plasma-assisted method for preparing perovskite type methane combustion catalyst

A plasma and methane combustion technology, applied in combustion methods, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of small specific surface area of ​​catalysts, affecting the catalytic efficiency of catalysts, and few defect sites, etc. The effect of low grain size and large specific surface area

Active Publication Date: 2020-11-10
NANJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these methods are that the prepared catalyst has a small specific surface area and few defect sites, which affects the catalytic efficiency of the catalyst.

Method used

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  • Plasma-assisted method for preparing perovskite type methane combustion catalyst
  • Plasma-assisted method for preparing perovskite type methane combustion catalyst
  • Plasma-assisted method for preparing perovskite type methane combustion catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take deionized water as solvent, weigh appropriate amount of lanthanum nitrate and manganese nitrate according to the molar ratio of lanthanum ion and manganese ion as 1:1, and prepare a mixed and uniform metal salt solution with a concentration of 2mol / L; use citric acid as complex agent, according to the molar ratio of metal ions (lanthanum ions and manganese ions) to citric acid is 1:1.5, citric acid is added to the aqueous solution of lanthanum nitrate and manganese nitrate, and stirred evenly at room temperature to form a mixed solution containing metal complexes. Put the mixed solution in an oil bath, heat and stir at 80°C and evaporate into a gel, that is, a wet gel. The wet gel was put into an oven and dried at 110°C to obtain a dry gel. The dry gel was ground into a powder, placed in a muffle furnace, and pretreated at 300°C for 4 hours to obtain a precursor.

[0035] Put the precursor in the glow discharge plasma equipment, pass through oxygen, discharge power...

Embodiment 2

[0040] Use deionized water as solvent, weigh appropriate amount of lanthanum nitrate, cerium nitrate and manganese nitrate according to the molar ratio of lanthanum ion, cerium ion and manganese ion as 4:1:5, and make a mixed uniform metal nitrate with a concentration of 2mol / L Salt solution; using citric acid as a complexing agent, according to the molar ratio of metal ions and citric acid as 1:1.5, adding citric acid to the aqueous solution of lanthanum nitrate, cerium nitrate and manganese nitrate, stirring at room temperature to form a metal-containing complex mixed solution of substances. Put the mixed solution in an oil bath, heat and stir at 70°C and evaporate into a gel, that is, a wet gel. The wet gel was put into an oven and dried at 100°C to obtain a dry gel. The dry gel was ground into a powder, placed in a muffle furnace, and pretreated at 300°C for 3 hours to obtain a precursor.

[0041] The precursor was placed in a glow discharge plasma device, fed with oxygen...

Embodiment 3

[0050] With deionized water as solvent, take appropriate amount of lanthanum chloride and cobalt chloride according to the molar ratio of lanthanum ion and cobalt ion as 1:1, and prepare a mixed and uniform metal salt solution with a concentration of 3mol / L; use citric acid as Complexing agent, according to the mol ratio of metal ion and citric acid is 1:1.4, citric acid is added in the aqueous solution of lanthanum chloride and cobalt chloride, stirs at normal temperature, forms the mixed solution containing metal complex; Put mixed solution In an oil bath at 70°C, heat and stir to evaporate into a gel, that is, a wet gel. The wet gel was put into an oven and dried at 100°C to obtain a dry gel. The dry gel was ground into a powder, placed in a muffle furnace, and pretreated at 300°C for 3 hours to obtain a precursor.

[0051] The precursor was placed in a glow discharge plasma device, fed with oxygen, the discharge power was 100kW, and treated in an oxygen atmosphere at 500°C...

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Abstract

The invention discloses a plasma-assisted method for preparing a perovskite type methane combustion catalyst, which comprises the following steps: adding a complexing agent into a soluble metal salt solution containing A-site elements and B-site elements to form a mixed solution containing a metal complex, evaporating the mixed solution to obtain wet gel, and drying and pretreating the wet gel toobtain a precursor; then putting the precursor into a glow discharge plasma generating device, and carrying out plasma treatment in an oxygen atmosphere to obtain the perovskite type methane combustion catalyst. According to the preparation method disclosed by the invention, lattice distortion of a perovskite structure is induced by utilizing the characteristic that high-energy particles generatedby gas discharge in glow discharge plasmas have active chemical properties; compared with a perovskite type catalyst prepared by traditional roasting or without plasma action, the catalyst has the advantages of more defect sites, lower grain size, larger specific surface area and the like, shows better activity in a methane combustion reaction, and reduces the temperature of the methane combustion reaction.

Description

technical field [0001] The invention relates to a novel functional material preparation technology, in particular to a plasma-assisted preparation of perovskite (ABO 3 ) method of methane combustion catalyst. Background technique [0002] People colloquially call plasma the "fourth state of matter". Plasma technology is a new type of functional material preparation technology developed in recent years, which has the advantages of low energy consumption, high efficiency and no pollution. When the applied voltage is applied, the gas molecules in the plasma are ionized to produce a mixture including electrons, ions, and atomic nuclei. According to the energy state, electron temperature and particle density of the system, it can be divided into low-temperature plasma and high-temperature plasma. Glow discharge plasma is a kind of low-temperature plasma. Under the action of external voltage, the generated electrons are used to excite neutral atoms or molecules and release ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/83B01J23/889B01J35/10B01J37/34F23G7/07
CPCB01J23/002B01J23/34B01J23/83B01J23/8892B01J35/1014B01J37/349F23G7/07F23G2209/14B01J2523/00B01J2523/3706B01J2523/3712B01J2523/72B01J2523/845B01J2523/24
Inventor 费兆阳乔旭邢佑鑫田青青崔咪芬陈献刘清张竹修汤吉海
Owner NANJING UNIV OF TECH
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