Preparation method of pore graded compound metal oxide

A composite metal and grading technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of reduced specific surface area, small specific surface area, and limited scale production, etc., and achieve the effect of simple preparation process and large specific surface area

Active Publication Date: 2018-10-23
HARBIN NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. The preparation process of graded porous materials is complicated, and the experimental conditions are harsh, which limits the scale production
[0005] 2. Most hydrotalcite-like porous materials have small specific surface area, and most of them are pores formed by stacking flake hydrotalcites
[0006] 3. Poor thermal stability
However, high-temperature treatment will transform hydrotalcite to spinel phase, resulting in a decrease in specific surface area and a decrease in adsorption sites, thereby affecting the number of times the material can be reused.

Method used

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  • Preparation method of pore graded compound metal oxide
  • Preparation method of pore graded compound metal oxide
  • Preparation method of pore graded compound metal oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Weigh 10 g of magnesium nitrate and add it to a beaker containing a mixed solution of 20 mL of glycerol and water, dissolve it, and process it at 400-600 °C for 3-8 hours to obtain solid substance A;

[0032] Step 2: Disperse 2 g of solid substance A into 20-50 mL of water, and add trivalent metal hydrochloride or nitrate to adjust the ratio of magnesium atoms to trivalent metal ions in the solution to 2 to 4;

[0033] Step 3: 20-80 o C, after standing and aging for 6 hours, the precipitate was filtered and dried to obtain precursor material B;

[0034] Step 4: Put the precursor material B at 300-800 o C roasting treatment to obtain hierarchical porous composite metal oxides.

Embodiment 2

[0036] This example is basically the same as Example 1, except that the trivalent metal hydrochloride or nitrate in step 2 is aluminum nitrate or aluminum chloride.

[0037] Magnesium aluminum hydrotalcite is easy to generate and its morphology is easier to control.

Embodiment 3

[0039] This embodiment is basically the same as Embodiment 2, the difference being step 3: 80 o C, after standing and aging for 6 hours, the precipitate was filtered and dried to obtain the precursor material B; step 4: the precursor material B was heated at 300 o C roasting treatment to obtain hierarchical porous composite metal oxides.

[0040] The prepared porous material has an adsorption capacity of 500 mg / g for Congo red; the specific surface area is greater than 120 m 2 / g.

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Abstract

The invention provides a preparation method of a pore graded compound metal oxide, belongs to the field of synthesis of inorganic materials, and relates to a synthesis method of a porous material. Thepreparation method specifically comprises the steps that soluble magnesium salt is dissolved in a water-polyhydric alcohol mixed solution and directly subjected to high-temperature treatment, and porous magnesium oxide is obtained. Porous magnesium oxide is dispersed into water, trivalent metal salt is added so as to condition the proportion of divalent metal ions and trivalent metal ions in thesolution, and the porous material is obtained through high-temperature treatment. The product of the preparation method can be widely applied, the synthesis technology is simplified, has the good porestructure and the relatively large specific surface area, and has the wide application prospect at the aspects of adsorption, catalysis and electrochemistry, and the like.

Description

technical field [0001] The invention belongs to the field of inorganic material synthesis, and relates to a method for preparing a composite metal oxide with hierarchical pores. Background technique [0002] A kind of composite metal oxide with high specific surface area and hierarchical pores has become a hot spot in the academic circle because of its wide application in the fields of adsorption, electricity, magnetism, catalysis, energy storage and conversion, etc. For composite metal oxides, the orderly combination of different metal atoms is the primary problem to be solved in the preparation of such compounds. The preparation of different metal atoms into hydrotalcite-like compounds as precursors is a conventional technical method to solve this problem. Further calcination to obtain the corresponding composite metal oxide. Hydrotalcite is a material with a layered structure. The layered structure is composed of laminates and interlayer anions. The laminates are compose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30
CPCB01J20/041B01J20/08
Inventor 李松南路嫔蔡清海
Owner HARBIN NORMAL UNIVERSITY
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