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Perovskite catalyst and its preparation method and use

A catalyst, perovskite technology

Active Publication Date: 2021-10-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of the technical problems existing in the prior art, for example: the preparation method is complex, the required raw materials and reaction conditions are high, which is not conducive to large-scale promotion; the doped elements tend to be enriched on the surface of the perovskite, which hinders the catalytic performance. Active B-site elements limit the further improvement of perovskite activity. The present invention firstly provides a perovskite catalyst, which overcomes the impact of strontium elements enriched on the surface compared with ordinary doped perovskite catalysts. Unfavorable effects brought by catalyst activity, and the perovskite catalyst of the present invention also has high stability, is a kind of catalyst of environment-friendly efficient catalytic oxidation volatile organic compound (VOCs)

Method used

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  • Perovskite catalyst and its preparation method and use
  • Perovskite catalyst and its preparation method and use
  • Perovskite catalyst and its preparation method and use

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preparation example Construction

[0048] A first aspect of the present invention provides a method for preparing a perovskite catalyst, comprising the following steps:

[0049] The template is used to adsorb the raw material solution to obtain a catalyst precursor;

[0050] heat-treating the catalyst precursor to obtain a doped perovskite-type composite;

[0051] dissolving the complex at least partially, and at least partially removing element B on the surface of the complex by the dissolving; wherein,

[0052] The doped perovskite-type composite has the following composition of formula (I)

[0053] A 1-x B x CO 3 (I)

[0054] B means doped with ACO 3 The metal elements in the perovskite structure, A element is selected from rare earth metals, B element is selected from alkaline earth metals, C is selected from transition metals, 0<x<1.

[0055] Compared with the common doped perovskite catalyst, the perovskite catalyst of the present invention overcomes the adverse effect of surface-enriched strontiu...

Embodiment 1

[0096] Step 1: Weigh 10.39g lanthanum nitrate, 1.27g strontium nitrate, 8.73g cobalt nitrate in 18mL deionized water, and stir at room temperature for 2h;

[0097] Step 2: Add 2g of template agent polymethyl methacrylate (PMMA) microspheres to the solution obtained in step 1 and soak for 10h;

[0098] Step 3: filter the solution in step 2, and dry the remaining solid at room temperature for 24h;

[0099] Step 4: Place the dry powder obtained in Step 3 in a tube furnace, raise the temperature from room temperature to 300°C at 1°C / min in a nitrogen atmosphere, keep at this temperature for 3 hours, then drop to room temperature, and switch to an air atmosphere with a temperature of 1°C. °C / min was raised to 300 °C and held at this temperature for 1 h, and finally raised to 900 °C and held at this temperature for 4 h. After cooling, the sample is La 0.8 Sr 0.2 CoO 3 .

[0100] Step 5: Lay the La obtained in Step 4 0.8 Sr 0.2 CoO 3 The powder was placed in 50 mL of 0.2 mol / ...

Embodiment 2

[0104] Step 1: Weigh 11.69g lanthanum nitrate, 0.64g strontium nitrate, 8.73g cobalt nitrate in 18mL deionized water, and stir at room temperature for 2h;

[0105] Step 2: Add 2g of template agent polymethyl methacrylate (PMMA) microspheres to the solution obtained in step 1 and soak for 10h;

[0106] Step 3: filter the solution in step 2, and dry the remaining solid at room temperature for 24h;

[0107] Step 4: Place the dry powder obtained in Step 3 in a tube furnace, raise the temperature from room temperature to 300°C at 1°C / min in a nitrogen atmosphere, keep at this temperature for 3 hours, then drop to room temperature, switch to an air atmosphere with a temperature of 1°C. °C / min was raised to 300 °C and held at this temperature for 1 h, and finally raised to 900 °C and held at this temperature for 4 h. After cooling, the sample is La 0.9 Sr 0.1 CoO 3 .

[0108] Step 5: Lay the La obtained in Step 4 0.9 Sr 0.1 CoO 3 The powder was placed in 50 mL of 0.2 mol / L ac...

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Abstract

The invention provides a perovskite catalyst, a preparation method and application thereof. The preparation method comprises the following steps: using a template agent to adsorb a raw material solution to obtain a catalyst precursor; performing heat treatment on the catalyst precursor to obtain a doped perovskite compound; dissolving the compound at least partially , to at least partially remove the B element on the surface of the composite through the dissolution; wherein, the doped perovskite composite has a composition A of the following formula (I): 1‑x B x CO 3 (I)B means doped in ACO 3 Metal elements in the perovskite structure, A element is selected from rare earth metals, B element is selected from alkaline earth metals, C is selected from transition metals, 0

Description

technical field [0001] The invention relates to the purification treatment of volatile organic waste gas, in particular to a perovskite catalyst and a preparation method and use thereof, in particular to a perovskite catalyst for efficiently catalyzing and oxidizing VOCs and its preparation and use, belonging to the technical field of environmental protection. Background technique [0002] Volatile organic compounds (VOCs) are one of the major air pollutants today, which are extremely harmful not only to human health, but also to the environment. Volatile organic compounds mainly come from daily life such as building materials and decoration materials, as well as industries such as chemical industry and power plant boiler exhaust. The vast majority of volatile organic compounds (such as low-carbon hydrocarbons, aromatic hydrocarbons, aldehydes, etc.) are toxic, odorous and flammable and explosive, which not only cause pollution to the ecological environment (such as photoche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/72B01D53/86B01J35/10
CPCB01J23/83B01D53/8668B01J35/60B01J35/613B01J35/651
Inventor 彭悦司文哲陈建军李俊华
Owner TSINGHUA UNIV