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Layered manganese oxide with water resistance and sulfur poisoning resistance and preparation method and application thereof

A layered manganese oxide and sulfur poisoning technology, applied in chemical instruments and methods, manganese oxide/hydroxide, combustion methods, etc., can solve problems such as catalyst activity reduction, and achieve low light-off temperature, water resistance and sulfur resistance. Good toxicity and large specific surface area

Inactive Publication Date: 2019-07-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the technical problem that the catalyst activity is reduced by water vapor and sulfur dioxide gas existing in the catalytic process of volatile organic compounds

Method used

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  • Layered manganese oxide with water resistance and sulfur poisoning resistance and preparation method and application thereof
  • Layered manganese oxide with water resistance and sulfur poisoning resistance and preparation method and application thereof
  • Layered manganese oxide with water resistance and sulfur poisoning resistance and preparation method and application thereof

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Effect test

Embodiment 1

[0029] The molar ratio of potassium permanganate to ethanol is 2:3, KMnO 4 The solution was added into the ethanol solution under constant stirring, and the KMnO 4 KMnO in solution 4 The dropping rate is 1.58mg / s. The above mixed solution was stirred at 10°C for 24h. Then, the generated precipitate was filtered, washed with deionized water, and dried at 80° C. to obtain a layered manganese oxide catalyst. The XRD of the layered manganese oxide catalyst that present embodiment obtains is as follows: figure 1 shown by figure 1 It can be seen that the positions of 12.5°, 25°, 36.5° and 65.5° correspond to δ-MnO 2 Crystal face (001)(002)(-111)(-312) of (JCPDS 80-1098). Among them, the diffraction peaks appearing on the (001) crystal plane indicate that the manganese oxide has a layered structure and belongs to the monoclinic crystal system.

Embodiment 2

[0031] The molar ratio of potassium permanganate to methanol is 1:1, KMnO 4 The solution was added into the ethanol solution under constant stirring, and the KMnO 4 KMnO in solution 4 The dropping rate is 4.74mg / s. The above mixed solution was stirred at 15°C for 48h. Then, the generated precipitate was filtered, washed with deionized water, and dried at 80° C. to obtain a layered manganese oxide catalyst.

Embodiment 3

[0033]The molar ratio of potassium permanganate to ethanol is 2:3, and the ethanol solution is quickly poured into the potassium permanganate solution under constant stirring. The above mixed solution was stirred at 10°C for 24h. Then the generated precipitate was filtered, washed with deionized water, and dried at 60° C. by blowing air to obtain a layered manganese oxide catalyst. The SEM and TEM images of the layered manganese oxide catalyst obtained in this example are shown in Figure 2(a) and Figure 2(b), respectively. It can be seen from Figure 2(a) that the layered oxide is randomly assembled from fine nanosheets into more agglomerates with a lamellar structure. It can be seen from Figure 2(b) that the surface of the nanosheets is rough and irregular, indicating that there are a large number of surface defects and oxygen vacancies on the surface.

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Abstract

The invention discloses layered manganese oxide with water resistance and sulfur poisoning resistance and a preparation method and application thereof, and belongs to the technical field of catalyticmaterials. The preparation method comprises the following steps: adding a KMnO4 solution into chain alcohol, or adding chain alcohol into a KMnO4 solution, and then reacting at the condition of 10-38DEG C for 6-48 h; and filtering after the reaction, washing a precipitate and drying to obtain layered manganese oxide. The carbon atom number of the chain alcohol is less than or equal to 4; and theraw materials are continuously stirred or vibrated during the addition process and the reaction process. The chain alcohol is preferably methanol or ethanol. When applied to catalytic combustion of volatile organic compounds, the prepared layered manganese oxide has advantages of high specific surface area, high catalytic activity, strong catalytic stability, excellent water resistance, sulfur poisoning resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a layered manganese oxide with water resistance and sulfur poisoning resistance, a preparation method and application thereof. Background technique [0002] Volatile organic pollutants (VOCs) are a large class of organic compounds with a boiling point of 50-260 °C, mainly including three categories of aldehydes, aromatic hydrocarbons and halogenated hydrocarbons, which are highly toxic to the human body and "carcinogenic-mutagenic-teratogenic" and other potential risks. At present, various processes such as adsorption, combustion, thermal catalytic oxidation, and photocatalytic oxidation have been applied to the removal of VOCs. Among them, the low-temperature catalytic oxidation method is to convert VOCs into harmless CO 2 and H 2 O is the most effective and economical method, and has no secondary pollution, so it has attracted more and more attention....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B01J23/34B01J35/10B82Y40/00F23G7/07
CPCC01G45/02B01J23/34B82Y40/00F23G7/07C01P2006/12C01P2004/24C01P2004/50C01P2002/72B01J35/615
Inventor 彭贝李仁铸邓威郭利民
Owner HUAZHONG UNIV OF SCI & TECH
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