Perovskite catalyst and preparation method and application thereof

A catalyst and perovskite technology, applied in the field of perovskite catalysts and their preparation and use, can solve the problems of high requirements for raw materials and reaction conditions, restricting the activity of perovskite, and being unfavorable for large-scale promotion, and achieving easy mass production. The effect of production, overcoming adverse effects, and simple and easy preparation method

Active Publication Date: 2020-05-22
TSINGHUA UNIV
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  • Abstract
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  • Claims
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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. Th

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  • Perovskite catalyst and preparation method and application thereof
  • Perovskite catalyst and preparation method and application thereof
  • Perovskite catalyst and preparation method and application thereof

Examples

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Example Embodiment

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

[0049] Use template agent to adsorb the raw material solution to obtain the catalyst precursor;

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

[0051] The complex is at least partially dissolved, and element B on the surface of the complex is at least partially removed by the dissolution; wherein,

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

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

[0054] B means doped in ACO 3 The metal element in the type 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

[0055] Compared with ordinary doped perovskite catalysts, the perovskite catalyst of the present invention overcomes the adverse effects of surface-enriched strontium ele...

Example Embodiment

[0095] Example 1

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

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

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

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

[0100] Step 5: Convert the La obtained in Step 4 0.8 Sr 0.2 CoO 3 The powder is placed in 50mL of 0.2mol / L acetic aci...

Example Embodiment

[0103] Example 2

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

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

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

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

[0108] Step 5: Convert the La obtained in Step 4 0.9 Sr 0.1 CoO 3 The powder is placed in 50mL of 0.2mol / L acetic acid for 3d;

[0109] ...

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Abstract

The invention provides a perovskite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adsorbing a raw material solution by using atemplate agent to obtain a catalyst precursor; carrying out heat treatment on the catalyst precursor to obtain a doped perovskite type composite; at least partially dissolving the composite, by meansof which the B element on the surface of the composite is at least partially removed; wherein the doped perovskite type composite has a composition A<1-x>BxCO3 (I); the B represents a metal element doped in an ACO3 type perovskite structure, the element A is selected from rare earth metals, the element B is selected from alkaline earth metals, the element C is selected from transition metals, andthe x is greater than 0 and less than 1. The perovskite catalyst provided by the invention overcomes the adverse effect of the strontium element enriched on the surface on the activity of the catalyst, and has high catalytic activity.

Description

technical field [0001] The invention relates to the purification treatment of volatile organic waste gas, in particular to a perovskite catalyst and its preparation method and use, in particular to a perovskite catalyst for efficiently catalyzing and oxidizing VOCs and its preparation and use, and belongs to the field of environmental protection technology. Background technique [0002] Volatile organic compounds (VOCs) are one of the main air pollutants nowadays, which are not only extremely harmful to human health, but also harmful 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, foul-smelling, flammable and explosive, not only polluting the ecological environment (such as generating ph...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01D53/72B01D53/86B01J35/10
CPCB01D53/8668B01J23/83B01J35/10B01J35/1014B01J35/1066
Inventor 彭悦司文哲陈建军李俊华
Owner TSINGHUA UNIV
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