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Method for eliminating formaldehyde at room temperature

A technology to eliminate formaldehyde and room temperature, applied in separation methods, chemical instruments and methods, heating methods, etc., can solve the problems of high price, high price, and difficulty in popularization and application, and achieve resource saving, waste water reduction, excellent water resistance and humidity resistance performance effect

Active Publication Date: 2022-07-12
安庆市长三角未来产业研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, at present, the catalysts that can eliminate formaldehyde at room temperature are mainly platinum-based catalysts. These noble metal catalysts have problems such as high price and difficulty in popularization and application.
For example: the patent specification with publication number CN111266129A provides a catalyst based on solid-phase OMS-2 molecular sieve room temperature catalytic elimination of formaldehyde, but this catalyst still needs to support Ag as the active center, and the price is still relatively high compared to cheap transition metals , which poses a great challenge to the large-scale promotion of the catalyst

Method used

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Examples

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Effect test

Embodiment 1

[0039] The potassium permanganate and cerium nitrate solid (the molar ratio of cerium and manganese is 0.05) are ground and mixed uniformly, transferred to the reactor, sealed, crystallized under autogenous pressure conditions at 100 ° C for 2 hours, and the solid obtained after the crystallization is washed. , filtered, and dried to obtain a cerium skeleton doped potassium manganite-type manganese oxide octahedral molecular sieve catalyst. XRD ( figure 1 ) and SEM photographs ( figure 2 ) confirmed the structure and morphology of the samples.

Embodiment 2

[0041] The potassium manganate and the cerium acetate solid (the molar ratio of cerium and manganese is 0.01) are ground and mixed uniformly, transferred to the reaction kettle, sealed, and crystallized for 3 hours under the autogenous pressure condition of 90 ° C, and the obtained solid after the crystallization is washed, Filtration and drying were carried out to obtain a cerium skeleton doped potassium manganite-type manganese oxide octahedral molecular sieve catalyst.

Embodiment 3

[0043] The manganese nitrate and cerium oxide solid (the molar ratio of cerium and manganese is 0.2) are ground and mixed uniformly, transferred to the reaction kettle, sealed, and crystallized under the autogenous pressure condition of 120 ° C for 1 time, the solid obtained after crystallization is washed and filtered. and drying to obtain a cerium skeleton doped potassium manganite-type manganese oxide octahedral molecular sieve catalyst.

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Abstract

The invention discloses a method for eliminating formaldehyde at room temperature. A cerium skeleton doped cryptomelane type manganese oxide octahedral molecular sieve catalyst is used for catalyzing formaldehyde to be completely oxidized at room temperature to generate carbon dioxide and water; according to the catalyst, a cryptomelane type manganese oxide octahedral molecular sieve is used as a basic framework, and cerium is used for replacing part of manganese on the framework; the preparation method of the catalyst comprises the following steps: mixing a manganese source and a cerium source in a solid phase, uniformly grinding, transferring into a reaction kettle, sealing, crystallizing for 1-3 hours at the temperature of 90-120 DEG C under self-generated pressure, and washing, filtering and drying the solid obtained after crystallization to obtain the catalyst, the molar ratio of cerium in the cerium source to manganese in the manganese source is (0.01-0.2): 1. The noble metal-free catalyst prepared by a specific preparation method can catalyze formaldehyde to be completely oxidized at room temperature to generate carbon dioxide and water, the formaldehyde conversion rate can reach 100%, the carbon dioxide selectivity is always 100%, no intermediate product is generated, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of environmental catalysis, in particular to a method for eliminating formaldehyde at room temperature, which can be applied to the purification of formaldehyde in indoor air and fixed source tail gas. Background technique [0002] At present, there are many cases where the concentration of formaldehyde in the indoor environment exceeds the standard. Formaldehyde pollution will cause great harm to people's physical and mental health. [0003] The sources of formaldehyde are very wide, and formaldehyde will be produced in food, clothing, housing, and transportation, and the release cycle will grow for 10 to 15 years. This brings great trouble to the control of formaldehyde pollution. The existing formaldehyde purification technologies are mainly based on activated carbon adsorption technology, photocatalyst technology and plasma technology. These technologies all have the problem that it is difficult to deg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J29/00B01D53/86B01D53/72F24F8/167F24F8/95
CPCB01J23/34B01J29/00B01D53/8668F24F8/167F24F8/95B01D2257/708B01D2258/06Y02A50/20
Inventor 孟祥举徐续盼
Owner 安庆市长三角未来产业研究院
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