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A kind of preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene

A manganese dioxide, catalytic oxidation technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that oxygen vacancies cannot be completely stable and difficult to disproportionate Control and other issues to achieve the effect of preventing agglomeration, simple steps, and strong high temperature resistance

Active Publication Date: 2022-08-05
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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  • A kind of preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene
  • A kind of preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene
  • A kind of preparation and use method of manganese dioxide catalyst for catalytic oxidation of toluene

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Effect test

Embodiment 1

[0041] (1) Mix 20mL concentration 0.20mol / L potassium hydroxide aqueous solution and 20mL concentration 0.10mol / L potassium permanganate aqueous solution at normal temperature, then add dropwise to 20mL concentration 1.00mol / L n-butanol aqueous solution, be warming up to Continue stirring at 60°C for 30min, after the reaction is completed, the product is suction filtered and washed with deionized water, and the obtained 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 100 nm;

[0042] (2) adding 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 adding 20 mL of ethylenediaminetetraacetic acid (EDTA) disodium salt aqueous solution with a concentration of 0.05 mol / L under stirring, Then ultrasonically treated for 30min, then continue to add 60mL of 0.10mol / L potassium permanganate aqueous solution dropwise to t...

Embodiment 2

[0045] (1) 20mL concentration of 0.10mol / L urea aqueous solution and 20mL concentration of 0.10mol / L potassium permanganate aqueous solution were mixed at normal temperature, then added dropwise to 20mL concentration of 1.00mol / L ethanol aqueous solution, heated to 60 ℃ and continued to stir 30min, after the reaction is completed, the product is suction filtered and washed with deionized water, and the obtained 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 100 nm;

[0046] (2) adding 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 adding 20 mL of ethylenediaminetetraacetic acid (EDTA) disodium salt aqueous solution with a concentration of 0.05 mol / L under stirring, Then ultrasonically treated for 30min, then continue to add 60mL of 0.10mol / L potassium permanganate aqueous solution dropwise to the abov...

Embodiment 3

[0049] (1) 20mL concentration 0.20mol / L sodium hydroxide aqueous solution and 20mL concentration 0.10mol / L potassium permanganate aqueous solution are mixed evenly at room temperature, and then dropwise added to 20mL concentration 1.00mol / L n-butanol aqueous solution, and the temperature is increased to Continue stirring at 60°C for 30min, after the reaction is completed, the product is suction filtered and washed with deionized water, and the obtained 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 100 nm;

[0050] (2) 2 mmol of the precursor is added to 20 mL of manganese sulfate solution with a concentration of 0.10 mol / L to form a dispersion, and then 20 mL of EDTA disodium salt aqueous solution with a concentration of 0.05 mol / L is added under stirring, Then ultrasonically treated for 30min, then continue to add 60mL of 0.10mol / L sodium permanganate aqueous solution dropwise ...

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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 catalytic oxidation of toluene. Synthesis of MnO with special dandelion morphologies by using low crystallinity precursor and temperature-programmed hydrothermal two-step method 2 catalyst, the resulting catalyst has more defect sites and higher (Mn 2+ +Mn 3+ ) / Mn 4+ Molar ratio, can achieve complete catalytic conversion of toluene at high space velocity and low temperature, the conversion rate is >98%, the catalyst has stable catalytic performance, has a long catalytic life, and has excellent catalytic effect on low-concentration toluene gas emitted in the air, which can be treated to near zero emissions.

Description

technical field [0001] The invention belongs to the field of material synthesis and discloses a preparation and use method of a manganese dioxide catalyst for catalytic oxidation of toluene. Background technique [0002] With the development of my country's social economy, the pace of industrialization and urbanization has been accelerating. Environmental protection and sustainable urban development have become issues of common concern. The control of air pollutants caused by industrialization and other human activities has also received more and more attention. Volatile organic compounds (VOCs), as one of the key air pollutants, are the main culprit in the formation of compound air pollution: secondary organic aerosols, which affect atmospheric visibility, form atmospheric photochemical smog, acid deposition, etc. Among them, aromatic VOCs include Benzene, toluene, o-xylene and chlorobenzene have high toxicity and "carcinogenic-mutagenic-teratogenic" effects on human heal...

Claims

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Application Information

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Patent Type & Authority Patents(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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