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A catalytic module for eliminating formaldehyde at room temperature and preparation method thereof

A technology that eliminates formaldehyde and room temperature. It is applied in the field of air purification. It can solve the problems of unfavorable reaction molecule adsorption product molecule desorption, limit the wide application of catalysts, and reduce catalyst efficiency. It achieves excellent low-temperature activity and removal efficiency, low precious metal loading, and Effect of improving catalytic activity and purification efficiency

Active Publication Date: 2017-12-15
展宗城
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patents use straight-hole cordierite honeycomb as the carrier skeleton, which limits the wide application of the catalyst
[0005] Catalysts used to oxidize formaldehyde at room temperature have disadvantages such as poor low-temperature activity, short life, and narrow application range. The existing monolithic catalytic modules use straight-hole cordierite honeycomb ceramics as the carrier skeleton, which is not conducive to the adsorption of reaction molecules and the adsorption of product molecules. desorption, reducing catalyst efficiency

Method used

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  • A catalytic module for eliminating formaldehyde at room temperature and preparation method thereof
  • A catalytic module for eliminating formaldehyde at room temperature and preparation method thereof
  • A catalytic module for eliminating formaldehyde at room temperature and preparation method thereof

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preparation example Construction

[0057] A method for preparing a catalytic module for eliminating formaldehyde at room temperature, the preparation of the above-mentioned catalytic module comprises the following steps: coating the coating 2 on the surface of the foamed ceramic structure by a vacuum coating method, and then coating the coating 2 by dipping or precipitation The step of carrying the catalyst layer 3 on the surface so as to obtain the catalytic module, the specific operation process includes the following steps:

[0058](1) Mix 10-40 parts by weight of coating precursor powder, 0.1-20 parts by weight of binder, 0.01-5 parts by weight of film-forming aid and deionized water, and the deionized water and coating precursor The mass ratio of the powder is 9:1~6:4; place the uniformly mixed slurry on a disperser, and disperse it at 300~550r / min for 20~60min; then use nitric acid or hydrochloric acid solution with a mass concentration of 5~20% to dissolve Adjust the pH of the slurry to pH=3~4, and conti...

Embodiment 1

[0072] Embodiment 1 Foam ceramic structure surface coating coating 2:

Embodiment 1-1

[0074] 50g TiO 2 (Type A), 1.5g HPMC-6000, 0.25g fatty alcohol polyoxyethylene ether (R=C16~18, n=20) and 250mL H 2 O Mix evenly, put it on a disperser and disperse at 350r / min for 30min, adjust the pH of the slurry to 3~4 with a 10% nitric acid solution, and continue to disperse for 15min; transfer the slurry to a sand mill for 1.5h Then transfer it to the storage tank of the vacuum coating machine, and then place the silicon carbide foam ceramic structure with a size of 100×100×20mm in the sample chamber for vacuum coating for 10 minutes, and use compressed air to blow out the excess slurry in the channel 4.

[0075] Put the slurry-coated foam ceramics in a curing box at 25°C and a relative humidity of 70% for 6 hours, dry at 80°C for 6 hours, and bake at 400°C in air flow for 4.0 hours to obtain carrier 1-1. 2 The coating amount is 57.8g / L.

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Abstract

The invention discloses a catalytic module for eliminating formaldehyde at room temperature and a preparation method thereof. The catalytic module includes a skeleton carrier, a coating and a catalyst layer. The skeleton carrier is a ceramic foam structure with three-dimensional channels, and the ceramic foam structure has a plurality of channels , the channels interweave into a network structure and the arrangement direction can be in any direction of X, Y and Z; the coating is evenly coated on the surface of the channels and the outer surface of the ceramic foam structure, and the catalyst layer is highly dispersed on the coating . The invention can oxidize low-concentration formaldehyde into H2O and CO2 at room temperature and ambient humidity, has excellent low-temperature activity and removal efficiency, and the removal efficiency of formaldehyde at a space velocity of SV=50000h-1 remains above 98%. The preparation process is simple, the load of noble metal is low, and no auxiliary equipment such as light source and heating are needed. It is suitable for air purification in closed and semi-closed spaces such as living rooms, office buildings, schools, dormitories, shopping malls, furniture markets, and automobiles.

Description

technical field [0001] The invention relates to an environmental catalytic material for purifying air and a preparation method thereof, belonging to the technical field of air purification, in particular to a catalytic module for eliminating formaldehyde at room temperature and a preparation method thereof. Background technique [0002] As we all know, formaldehyde is a colorless, pungent-smelling toxic gas at ambient temperature, and is the most toxic pollutant in indoor air pollution. Formaldehyde has been identified by the World Health Organization as a carcinogenic, mutagenic and teratogenic substance. Is a recognized source of allergies. Formaldehyde poses a serious threat to human survival and health. When the concentration of formaldehyde in the air exceeds 0.10mg / m 3 May significantly irritate the upper respiratory tract. Formaldehyde is even more harmful to children and pregnant women. Statistics from the China Environmental Protection Association show that 90% of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/88B01D53/72B01J23/42B01J23/58
Inventor 展宗城李顺马保安杨艳林袁小芳
Owner 展宗城
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