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Method for degrading VOCs (Volatile Organic Compounds) by catalyzing ozone oxidation through alpha-crystal-form manganese dioxide

A technology of manganese dioxide and ozone oxidation, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the problem of low catalytic degradation rate and achieve no secondary pollution effect

Active Publication Date: 2022-07-12
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the degradation of toluene by this catalyst, when the applied voltage is 17kV, the degradation rates of empty tube, titanium dioxide catalyst alone, and cerium-doped catalyst are 25.4%, 62.3%, and 70.3% respectively, and the catalytic degradation rate is relatively low.

Method used

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  • Method for degrading VOCs (Volatile Organic Compounds) by catalyzing ozone oxidation through alpha-crystal-form manganese dioxide
  • Method for degrading VOCs (Volatile Organic Compounds) by catalyzing ozone oxidation through alpha-crystal-form manganese dioxide
  • Method for degrading VOCs (Volatile Organic Compounds) by catalyzing ozone oxidation through alpha-crystal-form manganese dioxide

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Embodiment 1

[0048] The present embodiment provides a method for catalyzing ozone oxidation and degrading VOCs by manganese dioxide in α crystal form, and the method includes:

[0049] The VOCs mixed gas and ozone pass through a fixed bed reactor equipped with α-crystalline manganese dioxide, and the catalytic ozone oxidation reaction at a temperature of 30 ° C is carried out to degrade VOCs; the volume ratio of toluene and ozone in the VOCs mixed gas is 1:12 Nitrogen is introduced into the VOCs mixed gas as a balance gas, and the flow rate of the VOCs mixed gas is controlled to be 200 mL / min; the usage amount of the catalyst in the catalytic ozone oxidation reaction is 0.1 g, and the reaction of the VOCs mixed gas is 0.1 g. The airspeed is 120L / h / g;

[0050] The preparation method of the manganese dioxide of the α crystal form comprises the following steps:

[0051] The molar ratio of manganese sulfate tetrahydrate and potassium permanganate is 1:5.84, dissolved in deionized water, and s...

Embodiment 2

[0053] The present embodiment provides a method for catalyzing ozone oxidation and degrading VOCs by manganese dioxide in α crystal form, and the method includes:

[0054] The VOCs mixed gas and ozone pass through a fixed bed reactor equipped with α-crystal manganese dioxide, and the catalytic ozone oxidation reaction at a temperature of 30 ° C is carried out to degrade VOCs; the volume ratio of toluene and ozone in the VOCs mixed gas is 1:16 Nitrogen is introduced into the VOCs mixed gas as a balance gas, and the flow rate of the VOCs mixed gas is controlled to be 200 mL / min; the usage amount of the catalyst in the catalytic ozone oxidation reaction is 0.1 g, and the reaction of the VOCs mixed gas is 0.1 g. The airspeed is 120L / h / g;

[0055] The preparation method of the manganese dioxide of the α crystal form comprises the following steps:

[0056] The molar ratio of manganese chloride and potassium permanganate was 1:5.84. After mixing, the hydrothermal reaction was carrie...

Embodiment 3

[0058] The present embodiment provides a method for catalyzing ozone oxidation and degrading VOCs by manganese dioxide in α crystal form, and the method includes:

[0059] The VOCs mixed gas and ozone pass through a fixed bed reactor equipped with α-crystal manganese dioxide, and the catalytic ozone oxidation reaction at a temperature of 40 ° C is carried out to degrade VOCs; the volume ratio of toluene and ozone in the VOCs mixed gas is 1:12 Nitrogen is introduced into the VOCs mixed gas as a balance gas, and the flow rate of the VOCs mixed gas is controlled to be 100 mL / min; the usage amount of the catalyst in the catalytic ozone oxidation reaction is 0.05 g, and the reaction of the VOCs mixed gas is 0.05 g. The airspeed is 240L / h / g;

[0060] The preparation method of the manganese dioxide of the α crystal form comprises the following steps:

[0061] Manganese nitrate, potassium permanganate and deionized water were mixed in a molar ratio of 1:5.84, and then subjected to a ...

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Abstract

The invention provides a method for degrading VOCs (Volatile Organic Compounds) by catalyzing ozone oxidation through alpha-crystal-form manganese dioxide, which comprises the following step: VOCs mixed gas and ozone pass through a reaction device filled with alpha-crystal-form manganese dioxide to carry out catalytic ozone oxidation reaction so as to degrade VOCs. According to the method, manganese dioxide in the alpha crystal form is obtained by roasting at 550-700 DEG C and converting in the delta crystal form, the excellent VOCs ozone catalytic activity and CO2 selectivity are shown, the VOCs conversion rate is high, and no by-product is generated after the reaction; the method is simple to operate and suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of VOC waste gas treatment, in particular to a method for catalyzing ozone oxidation and degrading VOCs by manganese dioxide of α crystal form. Background technique [0002] The emission of volatile organic compounds (VOCs) in the atmosphere is increasing year by year, which not only seriously threatens the ecological environment, but also poses a huge threat to human health. The combustion method can directly convert VOCs into harmless small molecules such as COx and H 2 O, but requires a lot of energy to maintain. Catalytic oxidation technology reduces the reaction temperature of the incinerator from 1000 °C to below 600 °C, but effective treatment still requires a temperature higher than 200 °C. As a strong oxidant, ozone is often used for the removal of organic matter in wastewater and for microbial disinfection. Ozone can significantly reduce the apparent activation energy of VOCs oxidation more than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/44B01D53/72B01J23/34B01J37/10
CPCB01D53/8687B01D53/8668B01J23/34B01J37/10B01D2257/708B01D2251/104Y02A50/20
Inventor 贺泓陆宇琴邓华单文坡
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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