Porous nano manganese oxide catalyst, preparation and application thereof

A technology of manganese oxide and catalyst, which is applied in the field of porous nano-manganese oxide catalyst, which can solve the problems of surface defects, multi-water resistance, low light-off temperature, high light-off temperature, etc., to achieve rich oxygen vacancies and defect sites, and low light-off temperature , The effect of low catalytic ignition temperature

Inactive Publication Date: 2019-11-05
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a porous nano-manganese oxide catalyst, its preparation and application, which is prepared by a combustion method after mixing a manganese salt with an amino acid, and has a large specific surface area and a uniform pore size distribution. Manganese oxide, which has many surface defects and excellent water resistance, is used as a volatile organic compound oxidation catalyst. It has a low catalytic ignition temperature for volatile organic pollutants and is more stable, thus solving the problem of manganese oxide synthesized by traditional precipitation methods. The technical problems of high catalytic ignition temperature and easy deactivation of volatile organic pollutants

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  • Porous nano manganese oxide catalyst, preparation and application thereof
  • Porous nano manganese oxide catalyst, preparation and application thereof
  • Porous nano manganese oxide catalyst, preparation and application thereof

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[0038] The invention also provides a porous nano manganese oxide catalyst prepared according to the preparation method. The specific surface area of ​​the porous nano manganese oxide is 145m 2 / g-220m 2 / g; the porous nano manganese oxide is manganese trioxide.

[0039] The invention also provides the application of the porous nano-manganese oxide catalyst as a catalyst for catalytic combustion of volatile organic compounds.

[0040]The volatile organic compound in the present invention is a volatile compound with a boiling point of 50-260° C. and a saturated vapor pressure exceeding 133.322 Pa at room temperature. In some embodiments, the volatile organic compound is toluene, ethanol or chlorobenzene.

[0041] When the manganese trioxide prepared by the invention is applied to the catalytic combustion of volatile organic compounds, it has the advantages of high specific surface area, uniform pore size distribution, high catalytic activity, strong stability, excellent water ...

Embodiment 1

[0044] Add 7.16g of manganese nitrate solution and 1g of glycine into 10mL of water in a quartz crucible, put the above solution into a 350°C reaction for 30min after ultrasonication for 15min to obtain a powder sample; burn the obtained powder sample with deionized water and filter it, Porous nano-manganese oxide was obtained after air-drying at 110°C. The XRD figure of the porous nano-manganese oxide catalyst obtained in the present embodiment is as follows figure 1 shown by figure 1 It can be known that the porous nano-manganese oxide obtained in this example presents a diffracted crystal form of manganese trioxide by comparing with the standard PDF card.

Embodiment 2

[0046] 7.16g of manganese nitrate solution and 1g of glycine were added to 10mL of ethanol, ultrasonicated in a quartz crucible for 15min, and then the above solution was placed at 450°C for 10min to react to obtain a powder sample. Then, the resulting powder sample was washed, filtered, and air-dried at 110° C. to obtain a porous nano manganese oxide catalyst. The SEM figure of the porous nano-manganese oxide catalyst obtained in the present embodiment is as follows figure 2 shown by figure 2 It can be seen that the manganese oxide obtained in the examples exhibits a typical porous structure.

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Abstract

The invention belongs to the technical field of environmental catalytic materials, and more particularly relates to a porous nano manganese oxide catalyst and preparation and application thereof. Manganese salt and amino acid are mixed and dissolved in a solvent, then the temperature is raised to reach the ignition point of the amino acid, a combustion reaction occurs, a product is washed after the reaction is completed, and the porous nano manganese oxide catalyst is obtained after solid-liquid separation. When manganic oxide prepared by the method is applied to catalytic combustion of volatile organic compounds, the manganic oxide has the advantages of higher specific surface area, uniform pore size distribution, high catalytic activity, strong stability, excellent water resistance and the like. The porous nano manganese oxide catalyst has high combustion product selectivity, no secondary pollution, environmental friendliness, low cost and easy industrial production.

Description

technical field [0001] The invention belongs to the technical field of environmental catalytic materials, and more specifically relates to a porous nano manganese oxide catalyst, its preparation and application. Background technique [0002] In recent years, heavy pollution weather has occurred frequently in my country, and volatile organic compounds (VOCs) as PM 2.5 It is an important precursor for the formation of ozone and its governance has received extensive attention. Volatile organic compounds are a group of volatile compounds with a boiling point ranging from 50 to 260°C and a saturated vapor pressure exceeding 133.322Pa at room temperature, including toluene, ethanol, chlorobenzene, etc., which have a serious impact on human health and air quality. [0003] At present, a variety of processes have been applied to the removal of volatile organic compounds, such as adsorption, combustion, photocatalytic oxidation, etc. Among them, the catalytic combustion method is a...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10F23G7/07
CPCB01J23/34F23G7/07F23G2209/14B01J35/60B01J35/615Y02A50/20
Inventor 王逸夫李仁铸邓威张龙郭利民
Owner HUAZHONG UNIV OF SCI & TECH
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