Mesoporous manganese oxide nano granule and preparation method thereof

A nanoparticle, manganese oxide technology, applied in manganese oxide/manganese hydroxide and other directions, can solve problems such as cumbersome operation process, and achieve the effects of simple preparation process and equipment, good toluene combustion catalytic performance, and environmental protection.

Inactive Publication Date: 2009-12-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Papers published in Science 276 (1997) 926 and Chem.Commun. (1997) 1031 prepared mesoporous manganese oxide by using the surfactant template method, but the particles of the obtained material are usually micron-sized and irregular, and the surface activity used in the synthesis The agent needs to be removed after synthesis, and the operation process is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 3.4 g of manganese acetate in 10 ml of 25% ammonia solution, stir at room temperature for half an hour, add 5 ml of water and 0.2 g of NaF, and the pH of the solution is about 13. After continuing to stir for 2 hours, the mixture was transferred to a stainless steel reaction kettle containing a PTFE liner, and 3g of manganese flakes were put into the system at the same time, hydrothermally treated at 180°C for 24 hours, then filtered, washed, and dried at 80°C to obtain Brown solid powder. XRD test shows that the prepared material is β-MnOOH and Mn 3 o 4 SEM shows that the particle size is about 20-50nm; TEM shows that the material has irregular mesopores; the nitrogen adsorption isotherm and pore size distribution diagram show that the material has a typical mesoporous structure, and its BET specific surface area is 15m 2 / g; the mesopore diameter is 3nm.

Embodiment 2

[0020] The sample prepared in Example 1 was roasted in a muffle furnace at a heating rate of 2°C / min, and stopped after reaching 400°C for 3 hours. The XRD spectrum showed that the obtained material was Mn 5 o 8 Single crystal particles, SEM shows that the particle size is about 20-80nm; TEM shows that the material has irregular mesopores; nitrogen adsorption-desorption isotherm and the corresponding pore size distribution diagram show that the material has a typical mesoporous structure, BET ratio Surface area is 10m 2 / g, the mesopore diameter is 6nm.

Embodiment 3

[0022] The sample prepared according to Example 1 was roasted in a muffle furnace at a heating rate of 2 ° C / min, and stopped after 3 hours of roasting at 700 ° C. The XRD spectrum of the obtained material showed that the material was Mn 2 o 3 Single crystal particles, SEM shows that the particle size is about 20-80nm, TEM shows that the material has irregular mesoporous; the nitrogen adsorption-desorption isotherm and the corresponding pore size distribution diagram show that the material has a typical mesoporous structure, BET ratio Surface area is 8m 2 / g, the mesopore diameter is 10nm.

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Abstract

The invention relates to a mesoporous manganese oxide nano material and a preparation method thereof. In the invention, a uniformly distributed mesopore with the aperture of 2 to 10 nanometers and a mixture of oxyhydrogen manganese oxide and manganic manganous oxide or a mangano-manganic octoxide monocrystal granule or a manganese sesquioxide monocrystal granule with the granule particle diameter controlled within the range of 20 to 80 nanometers are prepared by the hydrothermal function of manganese metal, manganese acetate and ammonia and the subsequent calcination control, and the uniformly distributed mesoporous, the mixture of oxyhydrogen manganese oxide and manganic manganous oxide, the mangano-manganic octoxide monocrystal granule and the manganese sesquioxide monocrystal granule play a catalytic action to a toluene combustion reaction. The invention has simple preparation method, loose synthesizing condition, easy repetition and cheap raw materials and can carry out large-scale production.

Description

technical field [0001] The invention relates to a mesoporous manganese oxide nano material and a preparation method thereof, belonging to the field of inorganic porous materials and nano materials. Background technique [0002] Manganese oxide is an important chemical material widely used in the reduction of organic pollutants and electrode materials. At present, there are literatures to make manganese oxide into porous structure and nanoparticles in order to improve its catalytic activity and electrochemical performance. Papers published in Science 276 (1997) 926 and Chem.Commun. (1997) 1031 prepared mesoporous manganese oxide by using the surfactant template method, but the particles of the obtained material are usually micron-sized and irregular, and the surface activity used in the synthesis The agent needs to be removed after synthesis, and the operation process is cumbersome. Chinese patent CN1467159A discloses a porous manganese oxide nanosheet material, which is ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 任铁真
Owner HEBEI UNIV OF TECH
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