Preparation method of manganese oxide supported normal temperature catalyst and application

A manganese oxide, supported technology is applied in the field of preparation of manganese oxide-supported room temperature catalysts, which can solve the problems of difficult application of powder catalysts, and achieves the promotion of catalytic oxidation reaction and intermediate product conversion, mild reaction conditions and complete removal. Effect

Inactive Publication Date: 2019-02-26
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

The supported normal-temperature catalyst has no powder drop, solves the problem of difficult application of powder cata

Method used

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  • Preparation method of manganese oxide supported normal temperature catalyst and application
  • Preparation method of manganese oxide supported normal temperature catalyst and application
  • Preparation method of manganese oxide supported normal temperature catalyst and application

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preparation example Construction

[0021] A kind of preparation method of manganese oxide supported normal temperature catalyst of the present invention, comprises the following steps:

[0022] (1) Carrier pretreatment: add the carrier to water to wash 1 to 8 times, filter and dry at room temperature to 100°C; wherein, the carrier is at least one of ceramics, zeolite, silica gel, fiber, activated carbon, and molecular sieve, and the carrier is The size is not less than 60 mesh.

[0023] (2) Catalyst preparation: Dissolve permanganate in water, add additives, stir and mix evenly, put the cleaned carrier into the mixed solution, stir and react at room temperature for 0.5-12 hours, filter and air-dry naturally or place at 30-120 ℃ oven drying to obtain manganese oxide loaded catalyst at normal temperature; wherein, permanganate is sodium permanganate, ammonium permanganate, potassium permanganate, calcium permanganate, magnesium permanganate, zinc permanganate at least one of . The concentration of permanganate ...

Embodiment 1

[0028] Add activated carbon carrier with a size of not less than 60 mesh into water and wash 6 times, filter and dry in an oven at 30°C; dissolve 0.09mol potassium permanganate in 100mL water, add 0.08mol citric acid additive and stir until mixed evenly, and wash Put 9g of activated carbon into the mixed solution, stir and react at room temperature for 8h, filter and dry in an oven at 105°C to obtain MnO x / activated carbon.

[0029] figure 1 The SEM image in (a) shows that MnO x The particles are uniformly coated on the surface of the activated carbon carrier; figure 1 (b) TEM images of activated carbon and MnO x The interface is clearly visible, indicating that the MnO x Successfully loaded on the surface of activated carbon; figure 2 The XRD in a shows that the surface of activated carbon supports MnO x It is birnessite type with poor crystallinity; image 3 It can be seen from the figure of formaldehyde removal rate in a that MnO x / The removal rate of formaldeh...

Embodiment 2

[0031] Add the molecular sieve carrier with a size of not less than 60 mesh into water to wash twice, filter and dry in an oven at 50°C; dissolve 0.10mol of sodium permanganate in 100mL of water, add 0.05mol of ethylene glycol additives and stir until evenly mixed, and wash The final 6g molecular sieve was put into the mixed solution, stirred and reacted at room temperature for 6h, filtered and air-dried to obtain MnO x / molecular sieve.

[0032] figure 2 The XRD in b shows that the surface of the molecular sieve supports MnO x It is birnessite type with poor crystallinity; image 3 The formaldehyde removal rate figure in b shows that MnO x / Molecular sieves can remove formaldehyde up to 88%.

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Abstract

The invention relates to a preparation method of a manganese oxide supported normal temperature catalyst and application. The method comprises the following steps: adding a carrier into water to washthe carrier, and then filtering and drying the carrier; adding an additive into a permanganate aqueous solution, and uniformly stirring, so as to obtain a mixed solution, feeding the washed carrier into the mixed solution, then performing stirring reaction at normal operation, filtering and drying, so as to obtain the manganese oxide supported normal temperature catalyst; the manganese oxide supported normal temperature catalyst is used for removing formaldehyde pollutant in the air through catalytic oxidation. The formed manganese oxide supported normal temperature catalyst can efficiently and thoroughly remove formaldehyde at normal temperature, does not produce secondary pollutants, such as by-products, and achieves deep purification to polluted air. In addition, the method has the advantages that the preparation technology and equipment are simple and convenient to operate, the reaction conditions are mild, and the cost is low, and is easy for industrial production, and popularization and application.

Description

technical field [0001] The invention belongs to the field of normal temperature catalysts, and relates to a preparation method and application of a manganese oxide supported normal temperature catalyst. Background technique [0002] People now spend most of their time indoors, and indoor air quality is closely related to human health. Formaldehyde is the most harmful indoor gas pollutant, mainly from building materials, furniture, wood-based panels, various adhesives and coatings. The release cycle of formaldehyde can usually reach 3 to 15 years. However, long-term exposure to indoor environments with excessive formaldehyde (GB / T 1883: Indoor Air Quality Standards) can lead to headaches, eye / skin irritation, pneumonia, nasal tumors, and even nasopharyngeal cancer. In 2004, formaldehyde was officially identified as a primary carcinogen by the International Agency for Research on Cancer (IARC) of the World Health Organization. [0003] Traditional formaldehyde removal metho...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J29/00B01D53/86B01D53/72
CPCB01D53/8668B01D2257/708B01J23/34B01J29/00
Inventor 黄宇刘燕王震宇曹军骥
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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