Preparation method of alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy

A technology of photothermal synergy and alkaline earth metals, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of restricting wide application and high price, and achieve The effect of simple process, cheap raw materials, and easy industrialization

Inactive Publication Date: 2017-07-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the adsorption capacity, the adsorbent needs to be regenerated. Although the supported noble metal catalyst has high catalytic activity, it is expensive, which greatly limits the wide application of adsorption technology and noble metal-based catalytic oxidation technology in VOCs treatment.

Method used

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  • Preparation method of alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy
  • Preparation method of alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy
  • Preparation method of alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Mg-MnO with efficient photothermal synergistic catalytic purification of VOCs 2 The preparation method of composite catalyst (Mg / Mn molar ratio 1:16), concrete steps are as follows:

[0039] (1) Weigh 0.001875molMg(NO 3 ) 2 and 0.01molMn(NO 3 ) 2 , successively added to the solution containing 99ml water and 1ml concentrated HNO 3 (AR, 95-98wt%) in a beaker, magnetically stirred to obtain Mg(NO 3 ) 2 with Mn(NO 3 ) 2 mixed solution;

[0040] (2) Add 0.02mol KMnO to the mixed solution 4 , magnetically stirred, the obtained mixed solution was sealed well, put it in an oven at 75°C, and carried out hydrothermal redox reaction, and the reaction time was 24 hours;

[0041] (3) After the reaction is completed, the beaker is cooled to room temperature, and the precipitate in the beaker is taken out, filtered, washed, and dried to obtain Mg-MnO with photothermal synergistic effect. 2 Composite catalyst.

Embodiment 2

[0077] Mg-MnO with efficient photothermal synergistic catalytic purification of VOCs 2 The preparation method of composite catalyst (Mg / Mn molar ratio is 1:2) is as follows:

[0078] (1) Weigh 0.015mol Mg(NO 3 ) 2 and 0.01molMn(NO 3 ) 2 , added successively to a beaker containing 99ml of water and 1ml of concentrated nitric acid, and magnetically stirred to obtain Mg(NO 3 ) 2 with Mn(NO 3 ) 2 mixed solution;

[0079] (2) Add 0.02mol KMnO to the mixed solution 4 , carry out magnetic stirring, seal the obtained mixed solution well, put it in a 75°C oven, and carry out hydrothermal oxidation-reduction reaction;

[0080] (3) After reacting for 24 hours, the beaker was cooled to room temperature, and the precipitate in the beaker was taken out, filtered, washed, and dried to obtain Mg-MnO with photothermal synergistic effect. 2 Composite catalyst.

Embodiment 3

[0089] Mg-MnO with efficient photothermal synergistic catalytic purification of VOCs 2 The preparation method of composite catalyst (Mg / Mn molar ratio is 1:4) is as follows:

[0090] (1) Weigh 0.0075mol Mg(NO 3 ) 2 and 0.01molMn(NO 3 ) 2 , added successively to a beaker containing 99ml of water and 1ml of concentrated nitric acid, and magnetically stirred to obtain Mg(NO 3 ) 2 with Mn(NO 3 ) 2 mixed solution;

[0091] (2) Add 0.02mol KMnO to the mixed solution 4 , carry out magnetic stirring, seal the obtained mixed solution well, put it in a 75°C oven, and carry out hydrothermal oxidation-reduction reaction;

[0092] (3) After reacting for 24 hours, the beaker was cooled to room temperature, and the precipitate in the beaker was taken out, filtered, washed, and dried to obtain Mg-MnO with photothermal synergistic effect. 2 Composite catalyst.

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Abstract

The invention relates to a preparation method of an alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy. The method is characterized by taking low-cost and easily available soluble alkaline-earth metal R (Mg, Ca and Sr) (II) salt, Mn (II) salt and KMnO4 as raw materials and synthesizing the target catalyst through hydrothermal reaction. The method has the advantages of mild reaction condition, simple process, no additives, no high-temperature calcination and no load of noble metals, so that the production cost is greatly reduced. The prepared alkali-earth metal doped MnO2 compound catalyst has high adsorption in ultraviolet, visible and infrared spectra, catalysis activity and stability for efficiently degrading the VOCs through photoinduced thermal catalysis of ultraviolet, visible, infrared and full spectra; the photothermal catalysis activity of the catalyst is far higher than that of commercial TiO2(P25) which is used as a reference photocatalyst; the shortcoming that TiO2(P25) only has ultraviolet catalysis activity is overcome.

Description

technical field [0001] The invention relates to the technical field of catalyst synthesis, in particular to an alkaline earth metal-doped MnO with high-efficiency photothermal synergistic catalytic purification of VOCs 2 Catalyst preparation method. Background technique [0002] Volatile organic pollutants (VOCs), such as benzene, toluene, formaldehyde, acetone, etc., not only have great harm to human health, but also cause serious environmental pollution. VOCs treatment technologies include adsorption, absorption, combustion, condensation, biological purification, membrane separation, and photocatalysis. [0003] The adsorption method is to use a solid adsorbent with a large specific surface area, such as activated carbon, zeolite molecular sieve, etc., to adsorb VOCs, so as to achieve the effect of separating them from the gas mixture. This method is suitable for medium and low concentrations of VOCs, and the removal efficiency can exceed 90%-95%. At present, the most c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
Inventor 李远志方时明毛明杨陈俭杨懿
Owner WUHAN UNIV OF TECH
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