A surface-modified composite active al 2 o 3 -The preparation method of zno carrier spherical particles

A technology of surface modification and spherical particles, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems that activated alumina is not suitable and the adsorption capacity is not as good as activated carbon.

Active Publication Date: 2021-04-27
大连全净科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as an air purification carrier, activated alumina has lower adsorption capacity than activated carbon, and cannot chemically react with oxidatively degraded organic sulfides, organic amines, unsaturated hydrocarbons, etc., so a single activated alumina is not suitable for air purification. agent carrier use

Method used

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  • A surface-modified composite active al <sub>2</sub> o <sub>3</sub> -The preparation method of zno carrier spherical particles
  • A surface-modified composite active al <sub>2</sub> o <sub>3</sub> -The preparation method of zno carrier spherical particles
  • A surface-modified composite active al <sub>2</sub> o <sub>3</sub> -The preparation method of zno carrier spherical particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] ① Ball mill the active aluminum oxide that meets the standard to an average particle size of 0.8-1.0 μm to obtain alumina micropowder; ball-mill qualified zinc oxide to an average particle size of 1-1.5 μm to obtain zinc oxide micropowder; mix sodium bicarbonate , silver nitrate and carboxymethyl cellulose are mixed, and ball milled to an average particle size of 0.8-1.0 μm to obtain binder powder;

[0033] ② Mix the three micropowders prepared in step ① in a powder disperser and spray or extrude granules. After granulation, sieve out 5.0-7.0mm particles, and then press 130-150Mpa in an autoclave to form. Then put it into the mixed gas of ethanol, carbon dioxide and water vapor for fumigation for 3 to 4 hours for passivation;

[0034] ③ Activate and modify the particles obtained in step ② in a tunnel kiln at a temperature of 350°C-450°C, a heating rate of 35°C-40°C / h, keep warm for 2.5-3.5 hours, and obtain composite active particles after cooling.

[0035] The mass of...

Embodiment 2

[0040] ① Ball mill the active aluminum oxide that meets the standard to an average particle size of 0.8-1.0 μm to obtain alumina micropowder; ball-mill qualified zinc oxide to an average particle size of 1-1.5 μm to obtain zinc oxide micropowder; mix sodium bicarbonate , silver nitrate and carboxymethyl cellulose are mixed, and ball milled to an average particle size of 0.8-1.0 μm to obtain binder powder;

[0041] ② Mix the three micropowders prepared in step 1 in a powder disperser and spray or extrude to granulate. After granulation, sieve out 5.0-7.0mm particles, and then press 130-150Mpa in an autoclave to form. Then put it into ethanol, carbon dioxide and water vapor for fumigation for 3 to 4 hours for passivation;

[0042] ③ Activate and modify the particles in step ② in a tunnel kiln at a temperature of 350°C-450°C, a heating rate of 35°C-40°C / h, keep warm for 2.5-3.5 hours, and obtain composite active particles after cooling.

[0043] The mass of each component in ste...

Embodiment 3

[0048] ① Ball mill the active aluminum oxide that meets the standard to an average particle size of 0.8-1.0 μm to obtain alumina micropowder; ball-mill qualified zinc oxide to an average particle size of 1-1.5 μm to obtain zinc oxide micropowder; mix sodium bicarbonate , silver nitrate and carboxymethyl cellulose are mixed, and ball milled to an average particle size of 0.8-1.0 μm to obtain binder powder;

[0049] ②Mix the three micropowders prepared in step ① in a powder disperser and spray or extrude to granulate. After granulation, sieve out 5.0-7.0mm particles, and then press 130-150Mpa in an autoclave to form. Then put it into ethanol, carbon dioxide and water vapor for fumigation for 3 to 4 hours for passivation;

[0050] ③The particles in step ② are activated and modified in a tunnel kiln, the activation temperature is 350°C-450°C, the heating rate is 35°C-40°C / h, the temperature is kept for 2.5-3.5 hours, and the composite active particles are obtained after cooling. ...

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Abstract

The invention relates to a surface-modified composite active Al 2 o 3 The preparation method of ‑ZnO spherical carrier particles is modified with ethoxy groups on the surface of active alumina, comprising the following steps: active γ‑Al with a purity greater than 98.50% 2 o 3 or ρ‑Al 2 o 3 , Active ZnO, AgNO with a purity greater than 98.50% 3 , sodium bicarbonate and carboxymethyl cellulose are mixed in proportion, dispersed and beaten evenly in a powder disperser, made into spherical particles of a certain specification according to conventional methods, and smoked for 3 to 4 hours by passing ethanol, carbon dioxide and water vapor into the container Passivation is carried out, followed by drying at 350° C. to 450° C., modification and activation, and preparing composite active carrier spherical particles with surface modification. The composite active carrier prepared by the invention has the characteristics of reasonable pore size structure, high adsorption capacity and good structural strength, is an excellent carrier of oxidant, and can be used in the adsorption-oxidation process of indoor air.

Description

technical field [0001] The invention relates to a surface-modified composite active Al 2 o 3 -The preparation method of ZnO carrier spherical particles. Background technique [0002] Activated alumina is a porous and highly dispersible material. Its micropores exhibit adsorption properties, surface activity, and good thermal stability. The alumina carrier particles have good mechanical strength and strong hygroscopicity, and the particles will not crack after absorbing water. It does not expand and meets the basic requirements of chemical reaction catalysts and catalyst carriers. [0003] However, as an air purification carrier, activated alumina has lower adsorption capacity than activated carbon, and cannot chemically react with oxidatively degraded organic sulfides, organic amines, unsaturated hydrocarbons, etc., so a single activated alumina is not suitable for air purification. carrier used. Contents of the invention [0004] The technical problem to be solved by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/06B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01J20/06B01J20/08B01J20/28019
Inventor 陈飞龙段晓军
Owner 大连全净科技有限公司
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