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Preparation method of mesoporous metal oxide catalytic material

A technology of catalytic materials and oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problem of difficult mesopore structure and easy aggregation of metal oxide grains , maintenance and difficult to control the pore size, to achieve the effect of simple preparation

Pending Publication Date: 2022-03-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of material preparation, metal oxide grains are easy to aggregate, and the mesopore structure is difficult to maintain and the pore size is difficult to control.

Method used

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  • Preparation method of mesoporous metal oxide catalytic material
  • Preparation method of mesoporous metal oxide catalytic material
  • Preparation method of mesoporous metal oxide catalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 2.56g of cerium nitrate and 2.53g of zirconium nitrate and dissolve them in 5mL of ethanol respectively. Then the ethanol solutions of cerium nitrate and zirconium nitrate were mixed, and stirred at a speed of 700 r / min for 2 hours by magnetic stirring to obtain the ethanol solution of the metal precursor. Place the metal precursors in a vacuum oven at 80 °C to remove the solvent. Finally, the templating agent is removed by 600°C temperature-programmed calcination to obtain the mesoporous transition metal oxide material.

[0031] The transition metal oxide obtained by this method has a porous structure, and its pore radius distribution is concentrated between 0 and 30 nm, and its pore radius distribution is as follows: image 3 shown.

Embodiment 2

[0033] Firstly, the template material is prepared, and polyacrylonitrile nanoparticles are prepared by emulsion polymerization with acrylonitrile as a monomer. The particle size of the nanoparticles is 70nm, and the scanning electron microscope picture is as figure 1 shown. Using this as a template, the polymer particle dispersion was placed in a clean petri dish to dry to obtain a thin sheet formed by the particles, and its surface morphology was as follows: figure 1 shown. Weigh 2.56g of cerium nitrate and 2.53g of zirconium nitrate and dissolve them in 5mL of ethanol respectively. Then the ethanol solutions of cerium nitrate and zirconium nitrate were mixed, and stirred at a speed of 700 r / min for 2 hours by magnetic stirring to obtain the ethanol solution of the metal precursor. The thin sheet formed by assembling the template material was immersed in the ethanol solution of the metal precursor, and filtered to remove excess metal precursor solution after immersion for 2...

Embodiment 3

[0036] First, a template material was prepared, and polyphenolic resin nanoparticles were prepared by emulsion polymerization with phenol and formaldehyde as monomers. The particle size of the nanoparticles was 50 nm, and this was used as a template material. Weigh 2.56g of cerium nitrate and 0.25g of zirconium nitrate and dissolve them in 5mL of ethanol respectively. Then the ethanol solutions of cerium nitrate and zirconium nitrate were mixed, and stirred at a speed of 700 r / min for 2 hours by magnetic stirring to obtain the ethanol solution of the metal precursor. The dispersion of the template material is mixed with the ethanol solution of the metal precursor, and the amount of the dispersion of the template material is between 2 and 5 g. The mixed solution was placed in a vacuum oven at 80° C. to remove the solvent. Finally, the templating agent is removed by temperature-programmed calcination at 600° C. to obtain a mesoporous transition metal oxide material.

[0037] T...

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Abstract

The invention discloses a preparation method of a mesoporous metal oxide catalytic material, which comprises the following steps: mixing a metal precursor solution with a template material with a certain size, drying and roasting to obtain the mesoporous metal oxide catalytic material. The preparation method is simple and practical, and the mesoporous structure of the material can be regulated and controlled through different template materials. The catalyst can be applied to motor vehicle exhaust purification in the form of a catalyst, a catalytic promoter or a catalyst carrier and the like.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous metal oxide catalytic material, belonging to the field of catalytic materials. Background technique [0002] The number of motor vehicles in my country has increased year by year, and the environmental problems caused by motor vehicle exhaust pollutants have become increasingly serious, seriously affecting human health. At present, the catalytic conversion of exhaust gas is mainly realized by installing an exhaust gas purification device at the tail of the motor vehicle engine, so as to reduce the emission of motor vehicle exhaust pollutants from the source. [0003] Metal oxide catalytic materials play a vital role in exhaust gas purification devices. Among them, the pore structure of metal oxides, especially the mesoporous structure, not only affects the mass transfer and heat transfer of exhaust gas, but also significantly affects the catalytic activity and the life of catalytic materials...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10B01J37/00B01D53/94
CPCB01J23/10B01J23/002B01J37/0018B01D53/94B01D2258/012B01J35/60B01J35/643B01J35/647B01J35/651
Inventor 黄云李霞淡宜江龙
Owner SICHUAN UNIV
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