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Method for preparing magnesia with high specific surface

A high specific surface, magnesium oxalate technology, applied in the direction of magnesium oxide, etc., can solve the problems of high specific surface, high cost and high specific surface of MgO

Inactive Publication Date: 2008-03-05
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high cost in the preparation of high specific surface MgO and the difficulty of obtaining high specific surface by calcination at high temperature, and to provide a preparation method with low cost and high specific surface area of ​​the obtained product MgO

Method used

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  • Method for preparing magnesia with high specific surface

Examples

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Effect test

Embodiment 1

[0018] Prepare 0.8M Mg(CH 3 COO) 2 4H 2 O and 0.3M H 2 C 2 o 4 2H 2 O solution, under continuous stirring, the magnesium acetate solution was added dropwise to the oxalic acid solution in an equivalent ratio. This solution is often warmed for 12h, and the final pH value is 2. Filter the precipitate and dry it in an oven at 110°C to obtain MgC 2 o 4 2H 2 O, the grain size measured by XRD (X-ray diffraction) is 82nm. This MgC 2 o 4 2H 2 O at 520°C with a flow rate of 50mL·min -1 The product MgO is obtained by roasting in dry nitrogen for 4h, and the specific surface area of ​​this MgO is 477m 2 g -1 , The transmission electron microscope (see Figure 1) observed that the MgO particle size distribution is relatively uniform, the grain size is only 4-5nm, and the most probable pore size is 3.7nm (see Figure 2).

Embodiment 2

[0020] Prepare MgC with embodiment 1 2 o 4 2H 2 O, calcined in flowing air (1.3% water) at 520°C for 4h, the specific surface area is 411m 2 g -1 MgO.

Embodiment 3

[0022] Prepare MgC with embodiment 1 2 o 4 2H 2 O, calcined in flowing dry air at 520°C for 4h, the specific surface area is 450m 2 g -1 MgO.

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Abstract

This invention provides a method for preparing MgO with ultra-large specific surface area. The method comprises: (1) reacting between magnesium acetate and oxalic acid solution to obtain magnesium oxalate; (2) torrefying at a high temperature to obtain MgO with a specific surface area larger than 400 sq m / g. The method has such advantages as inexpensive raw materials, easy operation and high product quality.

Description

technical field [0001] The invention relates to a simple method for preparing magnesium oxide with high specific surface area, which belongs to the field of preparation of inorganic non-metallic materials. Background technique [0002] MgO is the metal oxide with the highest melting point, and has a wide range of applications in the fields of refractory materials, ceramics, textiles, coatings, superconducting materials, catalysts, catalyst supports and adsorbents. Increasing the specific surface area of ​​MgO can improve the performance of related catalysts and adsorbents. [0003] The specific surface area of ​​general commodity MgO is only 40m 2 g -1 about. Commonly used methods to prepare high specific surface MgO(S BET >100m 2 g -1 ) There are two methods: one is to obtain Mg(OH) by precipitation 2 , and then treated with alcohol replacement and calcined at 350-400°C, a specific surface area of ​​100-300m2 can be obtained. 2 g -1 The specific surface area of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/02C01F5/06
Inventor 谢有畅管洪波赵璧英朱月香
Owner PEKING UNIV
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