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Preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene

A manganese dioxide, catalytic oxidation technology, applied to metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Control and other issues to achieve the effect of preventing agglomeration, simple steps, and strong high temperature resistance

Active Publication Date: 2021-07-09
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with publication number CN110385125A utilizes MnO 2 The precursor is disproportionated in KOH to obtain MnO with more defect sites 2 catalyst, but the disproportionation process is difficult to control, and the formed oxygen vacancies cannot be completely stable in the subsequent roasting process

Method used

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  • Preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene
  • Preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene
  • Preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene

Examples

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Effect test

Embodiment 1

[0041] (1) 20mL concentration of 0.20mol / L potassium hydroxide aqueous solution and 20mL concentration of 0.10mol / L potassium permanganate aqueous solution are mixed uniformly at room temperature, and then added dropwise to a volume of 20mL concentration of 1.00mol / L n-butanol aqueous solution, and the temperature is raised to Continue to stir at 60°C for 30 minutes. After the reaction is completed, the product is suction-filtered and washed with deionized water, and the resulting filter cake is vacuum-dried at 60°C to obtain a low-crystallinity spherical manganese dioxide precursor with an average particle size of less than 100nm;

[0042] (2) Add 2 mmol of the precursor to 20 mL of manganese sulfate solution with a concentration of 0.10 mol / L to form a dispersion, then add 20 mL of 0.05 mol / L ethylenediaminetetraacetic acid disodium salt solution under stirring, Ultrasonic treatment for another 30 minutes, then continue to add 60 mL of 0.10 mol / L potassium permanganate aqueou...

Embodiment 2

[0045] (1) Mix 20 mL of 0.10 mol / L urea aqueous solution and 20 mL of 0.10 mol / L potassium permanganate aqueous solution at room temperature, and then add dropwise to 20 mL of 1.00 mol / L ethanol aqueous solution, heat up to 60°C and continue stirring After 30 minutes, the product was suction filtered and deionized water washed, and the resulting filter cake was vacuum-dried at 60°C to obtain a low-crystallinity spherical manganese dioxide precursor with an average particle size of less than 100 nm;

[0046] (2) Add 2 mmol of the precursor to 20 mL of manganese sulfate solution with a concentration of 0.10 mol / L to form a dispersion, then add 20 mL of 0.05 mol / L ethylenediaminetetraacetic acid disodium salt solution under stirring, Ultrasonic treatment for another 30 minutes, then continue to add 60 mL of 0.10 mol / L potassium permanganate aqueous solution dropwise to the above liquid under stirring, continue stirring for 60 minutes at room temperature after the dropwise addition...

Embodiment 3

[0049] (1) 20mL concentration of 0.20mol / L sodium hydroxide aqueous solution and 20mL concentration of 0.10mol / L potassium permanganate aqueous solution are mixed uniformly at room temperature, and then added dropwise to a volume of 20mL concentration of 1.00mol / L n-butanol aqueous solution, and the temperature is raised to Continue to stir at 60°C for 30 minutes. After the reaction is completed, the product is suction-filtered and washed with deionized water, and the resulting filter cake is vacuum-dried at 60°C to obtain a low-crystallinity spherical manganese dioxide precursor with an average particle size of less than 100nm;

[0050] (2) Add 2 mmol of the precursor to 20 mL of manganese sulfate solution with a concentration of 0.10 mol / L to form a dispersion, then add 20 mL of 0.05 mol / L ethylenediaminetetraacetic acid disodium salt solution under stirring, Ultrasonic treatment for another 30 minutes, and then continue to add 60 mL of 0.10 mol / L sodium permanganate aqueous ...

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PUM

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Abstract

The invention belongs to the field of material synthesis, and discloses a preparation and use method of a manganese dioxide catalyst for toluene catalytic oxidation. The MnO2 catalyst with a special dandelion morphology is synthesized by adopting a low-crystallinity precursor and a temperature programming hydrothermal two-step method, due to an interface effect, the obtained catalyst has more defect sites and a higher (Mn < 2 + > + Mn < 3 + >) / Mn < 4 + > molar ratio, complete catalytic conversion of toluene can be realized at a high space velocity and a lower temperature, the conversion rate being more than 98%; therefore, the catalyst has the advantages of stable catalytic performance, long catalytic life and excellent catalytic effect on low-concentration toluene gas discharged from air, and can be treated to near zero emission.

Description

technical field [0001] The invention belongs to the field of material synthesis and discloses a method for preparing and using a manganese dioxide catalyst used for catalytic oxidation of toluene. Background technique [0002] With the development of our country's social economy, the pace of industrialization and urbanization is accelerating. Environmental protection and urban sustainable development have become issues of common concern. More and more attention has been paid to the control of air pollutants brought about by industrialization and other human activities. As one of the key air pollutants, volatile organic compounds (VOCs) are the main culprits in the formation of composite air pollution: secondary organic aerosols, thereby affecting atmospheric visibility, forming atmospheric photochemical smog, acid deposition, etc., among which aromatic VOCs include Benzene, toluene, o-xylene and chlorobenzene have high toxicity and "carcinogenic-mutagenic-teratogenic" effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01J23/34B01D53/8668
Inventor 李伟刘岩岩关庆鑫
Owner NANKAI UNIV
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