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Method for preparing porous metal oxide by cold plasma-induced combustion

A cold plasma, porous metal technology, applied in the fields of energy science and material science, can solve the problems of long reaction time, not green and environmental protection, difficult to control, etc., and achieves the effect of fast processing rate, environmental friendliness, and energy saving

Inactive Publication Date: 2013-06-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The shortcomings of the above method are: the preparation process is cumbersome, the operation is complicated, the conditions are harsh and difficult to control, the reaction time is long, and the above method introduces many volatile organic solvents and is not environmentally friendly.
The disadvantages of this method are: the temperature of the reaction medium is too high, the induction time is long, and the energy required is large.
However, the reaction of cold plasma with carbon-containing framework materials to induce micro-combustion to prepare porous metal oxides has not yet been realized.

Method used

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  • Method for preparing porous metal oxide by cold plasma-induced combustion
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  • Method for preparing porous metal oxide by cold plasma-induced combustion

Examples

Experimental program
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Effect test

Embodiment 1

[0032] ZrO 2 The colloidal solution is impregnated on the activated carbon pellets, and the atomic mass of Zr accounts for 20% of the total mass. The loaded solid C77Zr is directly spread on the quartz glass plasma reaction chamber, and it is induced at room temperature. The average input voltage is 14000V, and the input current It is 0.3~0.8A, and the treatment time is 2 minutes each time, 8 minutes in total for 4 times. The discharge atmosphere used is an oxygen atmosphere, and the oxygen flow rate is 30mL min -1 . At the end of the discharge, the temperature of the quartz kettle is still at room temperature.

[0033] The prepared ZrO 2 After surface color observation, thermogravimetric analysis, X-ray diffraction and nitrogen adsorption and desorption analysis, the following analysis results were obtained:

[0034] like figure 1 As shown in the photo comparison of the samples before and after plasma treatment, it can be observed that the color of the sample changes sig...

Embodiment 2

[0039] NiCl 2 The equal volume is impregnated on the coal powder, the atomic mass of Ni accounts for 25% of the total mass, and the moisture is removed by drying after impregnation. The loaded solid is directly spread on the quartz glass plasma reaction chamber, and it is induced at room temperature. The average input voltage is 10000V, the input current is 0.5-01.0A, and the treatment time is 3 minutes each time, 12 minutes in total for 4 times. The discharge atmosphere used is an oxygen atmosphere, and the oxygen flow rate is 30mL min -1 . The plasma treatment process is accompanied by electric sparks, and the treated sample is mesoporous NiO with a pore size distribution of 5-20nm.

Embodiment 3

[0041] Zn(NO 3 ) 2 The equal volume is impregnated on the activated carbon particles, the atomic mass of Zn accounts for 40% of the total mass, and the moisture is removed by drying after impregnation. The loaded solid is directly spread on the quartz glass plasma reaction chamber, and it is induced at room temperature. The average input voltage is 14000V, the input current is 0.3-1.2A, and the treatment time is 3 minutes each time, 30 minutes in total for 10 times. The discharge atmosphere used is an oxygen atmosphere, and the oxygen flow rate is 30mL min -1 . After plasma treatment, the sample turns from black to white, and electric sparks appear during the treatment.

[0042] like Figure 5 The shown nitrogen adsorption-desorption isotherm of the sample after plasma treatment, after calculation, the specific surface area of ​​the sample is 92.04m 2 g -1 , the pore size distribution is mainly concentrated around 1.68nm, it can be seen that the sample is microporous ZnO...

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Abstract

The invention relates to a method for preparing a porous metal oxide by using cold plasma-induced micro-combustion. The method comprises the following steps of: mixing a metal salt or metal oxide with a carbon framework material or soaking the metal salt or metal oxide into the carbon framework material, and putting the mixture loaded with metal ions into a plasma reaction chamber; introducing air or oxygen or oxygen-containing gas mixture into the reaction cavity; and applying 6000-20000V alternating current to two ends of an electrode by using a high-voltage power supply under the atmospheric pressure, and enabling the gas to discharge by using 0.3-2.0A of current to form plasma-induced carbon-containing substance micro-combustion, wherein the micro-combustion time is 8-60 minutes. The cold plasma-induced micro-combustion technology is used for inducing micro-combustion by using particles, such as electrons, excited atoms or molecules, ions and free radicals generated by a plasma device to be reacted with the carbon-containing substances, and preparing the porous metal oxide by sufficiently utilizing the micro-combustion.

Description

technical field [0001] The invention relates to the technical fields of energy science and material science, in particular to a method for preparing porous metal oxides by micro-combustion induced by cold plasma. Background technique [0002] Due to the characteristics of low density, high porosity, large specific surface area and selective gas permeability, porous metal oxides have become a relatively rapid development of materials in current material science. Porous metal oxides have a wide range of applications in gas separation, porous electrodes, and storage media due to their structural diversity. [0003] Plasma is an ionized gas, usually a collection of six basic particles consisting of photons, electrons, ground state atoms or molecules, excited state atoms or molecules, positive ions and negative ions. A cold plasma, on the other hand, is a thermodynamically non-equilibrium plasma in which the electron temperature is high while the overall temperature remains low,...

Claims

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Application Information

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IPC IPC(8): B01J19/08
Inventor 郭秋婷刘媛赵彬然周昕瞳王巍刘昌俊
Owner TIANJIN UNIV
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