Catalyst material as well as preparation method and application thereof

A catalytic material and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of inability to achieve perovskite catalyst specific surface area, limited oxide types, and poor hydrophobic durability. and other problems, to achieve the effect of improving catalytic performance, conducive to durability, and small steric hindrance

Pending Publication Date: 2022-02-01
宁波橡树岭新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot improve the specific surface area of ​​perovskite catalysts, and the types of oxides combined with perovskite are limited.
[0005] In summary, the catalyst materials prepared in the prior art have poor hydrophobic persistence and poor stability, and the hydrophobic groups occupying adsorption sites affect the catalytic efficiency, poor dispersion, and small specific surface area, which further reduce the catalytic efficiency.

Method used

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  • Catalyst material as well as preparation method and application thereof
  • Catalyst material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0041] The embodiment of the present application also provides a preparation method for the above-mentioned catalyst material, including: providing a perovskite catalyst material; hydrophobically modifying the perovskite catalyst material with a hydrophobic component to obtain a perovskite-coated hydrophobic component A hydrophobically modified composite material with a core-shell structure; providing a multi-element metal oxide sol; mixing the hydrophobically-modified composite material and the multi-element metal oxide sol evenly, and applying the obtained slurry on a carrier, and then sintering at a high temperature to produce obtain the catalyst material.

[0042] figure 2 A schematic cross-sectional view showing the surface local structure of the above-mentioned catalyst material, wherein the effective catalytic component 5 includes a core-shell structure composed of multiple cores and shell layers and a multi-element metal oxide, and the effective catalytic component 5 ...

Embodiment 1

[0073] Perovskite catalytic materials (LaCo y Fe (1-y) o 3 ) preparation

[0074] Preparation using citric acid complexation. Weigh the precursors of La, Co and Fe in proportion, add them to water, add a certain amount of citric acid and stir evenly, and keep a certain temperature under stirring to react, then dry the reaction product, and sinter at high temperature after drying to obtain the catalytic material (LaCo y Fe (1-y) o 3 ).

[0075] Among them, the precursors of La, Co, and Fe are nitrates or acetates of the corresponding metals; the molar ratio of La element: (Co+Fe) element is 1:1.1; the molar ratio of Co element: Fe element is 1:0.2 The amount of citric acid is 1.1 times the number of moles of metal elements, the reaction temperature is 50°C, and the reaction time is 2h; the drying temperature is 120°C, and the drying time is 3h; the sintering temperature is 800°C, and the sintering time is 3h.

Embodiment 2

[0077] Perovskite catalytic materials (LaCo y Fe (1-y) o 3 ) hydrophobic modification

[0078] Put the perovskite catalytic material provided in Example 1 into acetone, ultrasonically disperse, and drop the hydrophobic component into the perovskite dispersion, control the amount of the hydrophobic component, continue stirring, and add acetic acid as a catalyst A condensation reaction between the hydrophobic component and the hydroxyl group on the surface of the perovskite catalytic material can obtain a hydrophobically modified composite material with a core-shell structure coated with the hydrophobically modified component.

[0079] Among them, the hydrophobic component is a fluorine-containing compound, specifically heptadecafluorodecyltrimethoxysilane, heptadecafluorodecyltriethoxysilane, tridecafluorooctyltriethoxysilane (PFOTES, the same below), One or more combinations of fluorine-containing polysilsesquioxane; the mass ratio of perovskite catalyst:hydrophobic compone...

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Abstract

The invention provides a catalyst material as well as a preparation method and an application thereof. The catalyst material comprises a core containing a hydrophobic component and a shell layer coating the core, the shell layer comprises a perovskite catalytic material, the chemical formula of the catalyst material is represented as LaMyFe(1-y) O3-R / Ce-M-Zr, M comprises any one or a combination of more than two of Mn, Fe, Co and Ni, R is a hydrophobic component, y is equal to 0-1, and the hydrophobic component has a hydrophobic group, and the hydrophobic group is exposed on the surface of the catalyst material. The catalyst material provided by the invention has a special core-shell structure, the hydrophobic component is coated by the active component, and the low-surface-energy group is exposed on the surface of the catalyst through rearrangement, so that the catalyst has good hydrophobicity, competitive adsorption of water vapor and reactants on the surface of the catalyst material is inhibited, and the catalytic efficiency of the catalyst material is favorably improved.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a catalyst material, its preparation method and application. Background technique [0002] Volatile organic compounds (VOCs) are a class of important pollutants emitted during industrial production, which seriously affect the natural environment and human health. The use of catalysts to catalytically decompose VOCs into harmless components such as carbon dioxide and water before emission is one of the important treatment methods. Perovskite composite oxides are typical VOCs decomposition catalysts. However, in addition to VOCs, there is often water vapor in the exhaust gas, and water vapor is also generated during the catalytic decomposition of VOCs. Water vapor easily competes with the reactants for adsorption on the surface of the catalyst, reducing the number of active sites, which is not conducive to the progress of the catalytic reaction. In addition, the spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J23/83B01D53/86B01D53/72
CPCB01J31/0274B01J31/0275B01J23/83B01J23/002B01J35/008B01D53/8668B01J2523/00B01D2257/708B01J2523/3706B01J2523/842B01J2523/845
Inventor 韩伟韩超杨静蓉
Owner 宁波橡树岭新材料科技有限公司
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