Preparation method of MOx@SiO2 shell-core structure catalyst

A core structure and catalyst technology, which is applied in the field of MOxSiO2 shell-core structure catalyst preparation, can solve the problems of SiO2 shell thickness limitation, uneven size of mother core, uneven shell thickness, etc., and achieves good reactivity and stability. , high activity and stability, uniform particle size effect

Active Publication Date: 2013-12-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of catalysts with a core-shell structure by the inverse microemulsion method has the advantages of uniform size, controllable particle size, and good dispersion, but this method is controlled by the stability of the inverse microemulsion, and the yield is very small, and SiO 2 Shell thickness is limited
The method of hydrolyzing tetraethyl orthosilicate under alkaline conditions to obtain nanoparticles with a shell-core structure has a large yield, but due to the uneven size of the mother core, the reunion of the mother core and the SiO 2 Problems such as uneven shell thickness

Method used

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  • Preparation method of MOx@SiO2 shell-core structure catalyst
  • Preparation method of MOx@SiO2 shell-core structure catalyst
  • Preparation method of MOx@SiO2 shell-core structure catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Weigh 0.06mol of manganese acetate tetrahydrate, add 8ml of oleic acid into 100ml of methanol, and after being uniformly dispersed, transfer the above solution into a reaction kettle with a volume of 200ml, and put it in a blast drying oven at 180°C for 24 hours of reaction Take it out, filter after cooling, wash with anhydrous methanol, dry and roast to get manganese tetraoxide nanoparticles.

[0034] Synthesized manganese tetraoxide nanoparticles see figure 1 , the particle size is about 7nm.

[0035] Weigh 1g of trimanganese tetraoxide nanoparticles and dissolve in 50ml of n-hexane, and then add 100ml of 0.05mol / L cetyltrimethylammonium bromide solution after complete dissolution, and ultrasonically disperse for 20min. Take 10ml of the above solution and dilute to 100ml. Then, 2.5 ml of 1 mol / L NaOH solution was added, and finally 1 ml of ethyl orthosilicate was added dropwise. After stirring for 24 hours at room temperature, centrifuge, wash, dry at 80°C, and cal...

Embodiment 2

[0040] Change the concentration of manganese tetraoxide solution, take 5ml and dilute it to 100ml. The dosage and operation process of other medicines are the same as in Example 1.

Embodiment 3

[0042] Change the amount of NaOH solution, take 1.2ml 1mol / L NaOH solution. The dosage and operation process of other medicines are the same as in Example 1.

[0043] Synthetic Mn 3 o 4 SiO 2 Core-shell structure nanoparticles see image 3 , the particle size is about 40nm, SiO 2 The shell is about 20nm.

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Abstract

The invention relates to a preparation method of a shell-core structure MOxSiO2, wherein the MOx is one of Mn3O4, Fe2O3, CeO2, Cu2O, or Co3O4. The preparation method comprises following steps: homogenously dispersing 0.01 to 0.1 mol of water-containing inorganic metal salt and 2 to 10 mL of oleic acid into 50 to 100 mL of absolute methanol, then putting the materials in a high-pressure reactor to subject the materials to crystallization reactions for 10 to 48 hours at the temperature of 120 to 240 DEG C, cooling and filtering so as to obtain MOx nano particles, dissolving the MOx nano particles in hexane, adding cetyl trimethyl ammonium bromide solution, subjecting the solution to an ultrasonic treatment, adding sodium hydroxide solution with a concentration of 0.5 M to 2 M, stirring, dropwise adding ethyl orthosilicate, carrying out the reactions at the room temperature for 10 to 24 hours, then subjecting the reaction product to a centrifugation treatment, washing, drying, and burning so as to obtain nano catalyst MOx@SiO2. The preparation method is simple and is easy to be applied to industrial production. The catalyst prepared by the preparation method is applied to the CO oxidation reaction, and has the advantages of low cost, and high activity and stability.

Description

technical field [0001] The invention belongs to the field of environment and chemical industry, and relates to a catalyst MO with a shell-core structure x SiO 2 Preparation method, especially related to a kind of MO for carbon monoxide oxidation, realizing high activity and high stability x SiO 2 A preparation method of a shell-core structure catalyst, that is, a metal oxide nanoparticle MO modified with oleic acid molecules x The invention discloses a preparation method of a catalyst with a shell-core structure in which the silicon dioxide is coated with a metal oxide as the mother core. Background technique [0002] CO is one of the common toxic gases. Exposure to CO atmosphere, if the concentration exceeds 25ppm within 8 hours and exceeds 50ppm within 4 hours, it will cause harm to the human body, and the lethal concentration is 650-700ppm. In 2000, global CO emissions reached 1.09 billion tons, mainly from automobile exhaust, power plant exhaust, and chemical produc...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/745B01J23/10B01J23/72B01J23/75B01J29/00B01J35/00B01D53/62B01D53/86
Inventor 韩一帆罗妍徐晶朱卡克邓雅晴李平
Owner EAST CHINA UNIV OF SCI & TECH
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