High temperature resistant magnetic carrier, its preparation process and application

A magnetic carrier and high-temperature-resistant technology, which is applied in the direction of catalyst carrier, inorganic material magnetism, chemical instruments and methods, etc., can solve the problems of easy loss of magnetism, and achieve the effect of complete coverage, uniform thickness, and uniform carrier particles

Inactive Publication Date: 2006-02-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing iron-containing oxide magnetic carrier is easy to lose its magnetism at high temperature, and to provide a high temperature resistant magnetic carrier and its preparation method and application

Method used

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  • High temperature resistant magnetic carrier, its preparation process and application
  • High temperature resistant magnetic carrier, its preparation process and application
  • High temperature resistant magnetic carrier, its preparation process and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: SiO 2 / (γ-Fe 2 o 3 -SiO 2 ) Synthesis of magnetic carrier (primary coating)

[0028] (1) Ethyl orthosilicate, absolute ethanol, deionized water, Fe(NO 3 ) 3 9H 2O was formulated into a solution at a weight ratio of 1:2:5:0.5, stirred for 1 hour, and nitric acid was used as a pH control agent to control the pH value of the solution at about 0.7 to obtain a relatively stable sol, which was naturally gelled in the air. The gel was placed in an oven and slowly heated to 110°C to obtain a dry gel. Calcined at 700°C after grinding to obtain Fe 2 o 3 / SiO 2 composite oxides.

[0029] (2) Add 1.0g of the above-mentioned composite oxide particles to 40ml of absolute ethanol and sonicate for 30min, add 20ml of ethyl orthosilicate solution (4ml of ethyl orthosilicate + 16ml of absolute ethanol), and dropwise add 2ml of ammonia solution , reacted for 6 hours under stirring conditions to ensure complete hydrolysis of tetraethyl orthosilicate, and after centrifu...

Embodiment 2

[0030] Example 2: SiO 2 / (γ-Fe 2 o 3 -SiO 2 ) Synthesis of magnetic carrier (multiple coatings)

[0031] After obtaining the magnetic carrier composite oxide in Example 1, repeat the operation according to the coating process described in step (2) in Example 1 to obtain the secondary SiO 2 The coated magnetic carrier, the transmission electron microscope photo of the second coated magnetic carrier is as follows image 3 shown.

Embodiment 3

[0032] Embodiment 3: with Al 2 o 3 Magnetic carrier coated for the third time

[0033] According to the step (1) of Example 1, 0.5 g of the product of Example 2 was added to 40 ml of deionized water, and ultrasonicated for 30 min, and 20 ml of sodium metaaluminate aqueous solution with a concentration of 0.05 g / ml was added, and 0.5 ml of Aqueous nitric acid solution with a concentration of 2 mol / l was reacted under stirring conditions for 6 hours, and after centrifugal filtration, the reactant particles were dried at 110°C to obtain Al 2 o 3 / (γ-Fe 2 o 3 -SiO 2 ) Magnetic catalyst carrier, which can be attracted by magnetic objects such as natural magnets and electromagnets.

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Abstract

The invention discloses a thermostable magnetic carrier and the method for preparation and the application, belonging to the art of magnetic composite material. The thermostable magnetic carrier is a core- shell structure of XmOn/ gamma- Fe2O3- SiO2. Prepare magnetic the core of gamma- Fe2O3- SiO2 composite oxide firstly, and then coat with multiple outer layer of XmOn oxide. The carrier can support plural of catalyst activity and absorption activity, and is characterized in that it is thermostable. And it is suit for the production or treatment of magnetic catalyst, magnetic absorption in high temperature.

Description

technical field [0001] The invention belongs to the field of magnetic composite materials, more specifically, the invention relates to a magnetic gamma-Fe 2 o 3 -SiO 2 A high-temperature-resistant magnetic carrier composed of a composite oxide core and an oxide coating layer, its preparation method and application. Background technique [0002] Due to the characteristics of large specific surface area and rich active sites, ultra-fine and nano-sized catalysts and adsorbents have significantly better activity than traditional large-sized materials, showing great application value. However, there is a problem of separation difficulty in the application of such materials, which not only easily causes waste and increases the cost of use, but also may cause pollution due to emissions. If such powder materials are made magnetic, they can be separated easily and effectively by applying an external magnetic field after use. Taking catalysts as an example, people have begun resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J20/10B01J23/30H01F1/10
Inventor 徐盛明王松威陈崧哲李林艳徐刚徐景明
Owner TSINGHUA UNIV
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