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Lanthanum ferrite perovskite material and preparation method and application thereof

A perovskite material, lanthanum ferrite technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of gas production sensible heat loss, affecting production safety, biomass energy waste, etc., to achieve stability Good, enhanced removal rate, high removal rate

Inactive Publication Date: 2021-12-07
TSINGHUA UNIV
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Problems solved by technology

However, the tar component in the pyrolysis / gasification gas is easy to condense, which will cause pipeline blockage and seriously affect production safety.
At present, the removal of tar in industry mainly adopts water washing, cyclone, electrostatic dust removal, etc., but since tar is an aggregate of hydrocarbons, separating tar will lead to a large waste of biomass energy; at the same time, using the above methods to remove tar requires cooling processing, which results in a large loss of sensible heat of gas production

Method used

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  • Lanthanum ferrite perovskite material and preparation method and application thereof
  • Lanthanum ferrite perovskite material and preparation method and application thereof
  • Lanthanum ferrite perovskite material and preparation method and application thereof

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Embodiment 1

[0060] A preparation method of lanthanum ferrite perovskite (LFOC) material, comprising the following steps:

[0061] (1) According to the molar ratio La(NO 3 ) 3 :Fe(NO 3 ) 3 =1:1 Weigh an appropriate amount of La(NO 3 ) 3 and Fe(NO 3 ) 3 Dissolve the powder in deionized water, stir thoroughly in a water bath at 45°C for 30 minutes, then add an aqueous solution of citric acid according to the molar ratio of metal cations to citric acid at 1:1, and stir thoroughly in a water bath at 45°C for 30 minutes. The mixed liquid was frozen in a -80°C refrigerator for 24 hours, and the frozen sample was dried in a vacuum chamber for 24 hours at a temperature of -60°C and a pressure of 10Pa.

[0062] (2) The dried solid was placed in a muffle furnace, heated from room temperature to 400°C at a heating rate of 5°C / min, and calcined at a constant temperature for 4 hours, then raised to 900°C at a heating rate of 4°C / min, and calcined at a constant temperature for 4 hours. After coo...

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Abstract

The invention discloses a lanthanum ferrite perovskite material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing lanthanum nitrate, ferric nitrate and water to obtain a mixed salt solution; (2) mixing the mixed salt solution with citric acid to obtain a precursor solution; (3) performing freezing treatment and vacuum freeze drying on the precursor solution to obtain a lanthanum ferrite precursor; and (4) carrying out calcination treatment on the lanthanum ferrite precursor so as to obtain the lanthanum ferrite perovskite material. The method is simple in process, the lanthanum ferrite perovskite material prepared through the freeze drying method performs lattice oxygen activation on oxidizable organic matter at a high temperature, and meanwhile, metal sites on the surface of the material can catalyze C-H bond breakage of tar components, in-situ removal of gasified tar can be achieved, and the tar components are directionally converted into H2, CO and / or C.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a lanthanum ferrite perovskite material and a preparation method and application thereof. Background technique [0002] Pyrolysis gasification technology, as a technical means of resource utilization of organic solid waste, has been extensively researched and applied in biomass gasification and coal chemical industries. However, the tar component in the pyrolysis / gasification gas is easy to condense, which will cause pipeline blockage and seriously affect production safety. At present, the removal of tar in the industry mainly adopts water washing, cyclone, electrostatic dust removal, etc., but since tar is an aggregate of hydrocarbons, separating tar will lead to a large waste of biomass energy; at the same time, using the above methods to remove tar requires cooling processing, which results in a substantial loss of sensible heat of gas production. In view of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C01B3/22
CPCC01G49/0054C01B3/22C01P2002/72C01P2004/03
Inventor 赵明吕熠杨航
Owner TSINGHUA UNIV
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