Ordered mesoporous gamma-MnO2 catalyst and preparation method and application thereof

A catalyst and mesoporous technology, applied in the field of ordered mesoporous γ-MnO2 catalyst and its preparation, can solve the problems that the preparation method has not been reported yet, and achieve the effect of simple and controllable preparation method, low energy consumption and good repeatability

Active Publication Date: 2018-12-18
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, ordered mesoporous γ-MnO is obtained by acid etching 2 The preparation method of the catalyst has not been reported yet

Method used

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  • Ordered mesoporous gamma-MnO2 catalyst and preparation method and application thereof
  • Ordered mesoporous gamma-MnO2 catalyst and preparation method and application thereof
  • Ordered mesoporous gamma-MnO2 catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 An ordered mesoporous γ-MnO 2 catalyst

[0056] 1. Preparation method

[0057] This example provides an ordered mesoporous γ-MnO 2 Catalyst, its preparation method comprises the following steps:

[0058] (1) Add 1.0 g of KIT-6 mesoporous silica to 10 mL, 0.3 mol / L manganese nitrate ethanol solution, stir and impregnate at room temperature for 2 h, evaporate excess ethanol at 80 °C and dry it at 60 °C, and Preliminary calcination at 350°C for 3 hours in the atmosphere, with a heating rate of 1°C / min; repeat the impregnation and drying step 1 to 2 times, and finally calcine at a constant temperature of 650°C for 5 hours in the air atmosphere, with a heating rate of 1°C / min, to obtain high-filling Mn 2 o 3 precursor; then, the mesoporous Mn 2 o 3 The precursor was soaked and stirred in 2mol / L sodium hydroxide solution for 24h, centrifuged, washed, and dried to obtain the mesoporous Mn 2 o 3 Precursor;

[0059] (2) 1g of the above-mentioned mesoporous Mn ...

Embodiment 2

[0066] The preparation method of the catalyst of the present embodiment is substantially the same as that of Example 1, except that:

[0067] (1) In step (1), the final calcination temperature of the precursor is 600°C;

[0068] (2) In step (2), the obtained 1g mesoporous Mn 2 o 3 The precursor powder was added to 100mL, 3mol / L nitric acid solution, stirred at 80°C for 2h, and then centrifuged, washed and dried several times to obtain ordered mesoporous γ-MnO 2 catalyst.

[0069] Gained catalyst is analyzed by X-ray diffraction and electron microscope, and its result is identical with embodiment 1, and this catalyst is ordered mesoporous γ-MnO 2 catalyst.

Embodiment 3

[0071] The preparation method of the catalyst of the present embodiment is substantially the same as that of Example 1, except that:

[0072] (1) In step (1), the concentration of manganese nitrate ethanol solution is 0.9mol / L;

[0073] (2) In step (2), the obtained 1g mesoporous Mn 2 o 3 The precursor powder was added to 50mL, 5mol / L nitric acid solution, stirred at 120°C for 0.5h, and then centrifuged, washed and dried several times to obtain ordered mesoporous γ-MnO 2 catalyst.

[0074] Gained catalyst is analyzed by X-ray diffraction and electron microscope, and its result is identical with embodiment 1, and this catalyst is ordered mesoporous γ-MnO 2 catalyst.

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Abstract

The invention provides an ordered mesoporous gamma-MnO2 catalyst and a preparation method and application thereof. The preparation method comprises the following steps: S1. using mesoporous silica asa template, immersing the mesoporous silica in a manganese salt solution and drying , after preliminary calcination, repeatedly immersing and drying the mesoporous silica for 1 to 3 times, after finalcalcination, soaking the template in an alkali solution to obtain a mesoporous Mn2O3 precursor; and S2. adding the mesoporous Mn2O3 precursor to a mineral acid solution, and stirring under heating toobtain the ordered mesoporous gamma-MnO2 catalyst. The gamma-MnO2 catalyst with high low temperature activity is developed, the preparation process is simple and controllable, the energy consumptionis low, and the repeatability is good; the obtained gamma-MnO2 has an ordered mesoporous structure, a large specific surface area and a uniform mesoporous pore diameter, has good catalytic activity for catalytic combustion of toluene, can be applied to the catalytic elimination of volatile organic gases in air, and has important significance for atmospheric environmental protection.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation. More specifically, it relates to an ordered mesoporous γ-MnO 2 Catalyst and its preparation method and application. Background technique [0002] The rapid development of modern industry has led to more and more serious environmental pollution problems. Volatile organic gases (VOCs) are the main source of air pollution. The emission of VOCs not only produces photochemical pollution, but also causes serious consequences such as ozone layer depletion and animal and plant poisoning. Catalytic combustion reaction is one of the important means to eliminate VOCs. Therefore, the development of efficient and inexpensive catalysts is of great significance for the purification of VOCs. At present, noble metals (gold, platinum, palladium, etc.) have high activity for catalytic combustion of VOCs, but they are expensive and resources are scarce. Transition metal oxide catalysts hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10C01G45/02F23G7/07
CPCB01J23/34B01J35/1004B01J35/1061C01G45/02C01P2002/01C01P2002/30C01P2002/72F23G7/07
Inventor 余林曽小红程高刘琪陈丽雅余伟雄
Owner GUANGDONG UNIV OF TECH
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