Room temperature catalyst for removing formaldehyde in air and method of preparing the same

An oxidation catalyst, formaldehyde technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as expensive catalysts

Active Publication Date: 2008-10-01
SUZHOU IND PARK ANZEWEN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high Pt content (12%) in the catalyst makes the price of the catalyst expensive, so this catalyst can only be used in special occasions such as military industry or aerospace
Chinese patent CN1698932A uses a gold-loaded rare earth oxide or an adsorbed composite oxide catalyst, which can achieve better results at a temperature of 80-100 ° C. However, high humidity and heat energy input are the biggest obstacles to the wide application of this catalyst

Method used

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  • Room temperature catalyst for removing formaldehyde in air and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of Co-Ce-Sn composite oxide cordierite honeycomb ceramic support: Dissolve cobalt nitrate, cerium nitrate and tin chloride in di-(2-ethylhexyl) sodium sulfosuccinate (AOT) / In ethanol / deionized aqueous solution (where the molar ratio of AOT, ethanol, and water is 5:30:80), according to the appropriate Co-Ce-Sn molar ratio (see Table 1), the above three solutions were mixed and stirred vigorously Add appropriate amount of H under the condition 2 o 2 , H 2 o 2 The molar ratio to the metal ions in the solution is 1:1; an appropriate amount of ammonia water with a concentration of 0.20 mol / l is added dropwise to the mixed solution, and its pH value is finally adjusted to 7-9; the resulting colloidal liquid mixture is ultrasonically treated for 1 hour ; The precipitate in the colloidal liquid mixture was centrifuged, washed with deionized water, and dried at 110°C for 24h to obtain a composite oxide precursor, which was then roasted in air at 400°C for 2h to o...

Embodiment 2

[0024] Preparation of catalysts A-E: The coated Co-Ce-Sn composite oxide cordierite honeycomb ceramic carrier obtained in Example 1 was impregnated in Pt(NH 3 ) 2 (NO 2 ) 2 In aqueous solution, the concentration of Pt is 0.01mol / l. Take it out and dry it in the air at 110°C for 2 hours to obtain a loaded Pt precursor, and then treat the loaded Pt precursor at 200°C in pure hydrogen for 2 hours. The content of Pt accounts for 1.0% of the composite oxide.

[0025] Catalyst performance tests were carried out in a continuous-flow fixed-bed reactor. Cylindrical cordierite honeycomb ceramic catalyst (high 23mm, diameter 20mm, 400 holes / inch) loaded in a glass tube, at room temperature (18-25 ℃) and relative humidity of 70%, pass through the 3 For formaldehyde air, the wind speed is 2.5m / s. Reactor outlet gas was analyzed by Innoval312 gas concentration detector and trace gas analysis mass spectrometer (PTR-MS) at the same time. Experiments show that formaldehyde is completely...

Embodiment 3

[0027] Preparation of Catalysts F-K with different Pt contents: The Co-Ce-Sn composite oxide cordierite honeycomb ceramic carrier obtained in Example 1 was impregnated in Pt(NH 3 ) 2 (NO 2 ) 2 In the aqueous solution, the concentration of Pt in the solution is adjusted so that the content of Pt in the finished catalyst accounts for 0-10% of the composite oxide. Take it out and dry it in the air at 110° C. for 2 hours to obtain a loaded Pt precursor, and then treat the loaded Pt precursor at 200° C. in pure hydrogen for 2 hours.

[0028] The performance test of the catalyst is the same as in Example 2. The experiment shows that formaldehyde is completely decomposed into harmless water and carbon dioxide, without by-products such as formic acid, carbon monoxide and methyl formate. The results are listed in Table 1.

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Abstract

The invention discloses a high-efficiency oxidation catalyst which is used for oxidizing formaldehyde into H2O and CO2 below the room temperature and a preparation method thereof, and the invention is characterized in that the high-efficiency oxidation catalyst takes a honeycomb cordierite pottery and porcelain coated with poriferous Co-Ce-Sn composite oxides as a carrier, 0 to 10 percent of Pt as active components, and MoO3, CuOx, MnOx, TiO2 and so on as accessory ingredients, and the high-efficiency oxidation catalyst does not need energy resources such as light, heat and electricity, etc. and chemical agents to be additionally provided, has much higher removing efficiency of formaldehyde than the techniques of photochemical catalysis and plasma under the conditions of heavy blast volume and high humidity level, etc., does not have any byproduct, and is applicable to the highly-efficient removing of formaldehyde pollution of enclosed or semi-enclosed spaces such as production departments of man-made boards, living rooms and building material and furniture markets, etc.

Description

technical field [0001] The invention relates to a formaldehyde oxidation catalyst, that is to say, it relates to a catalyst for oxidizing harmful formaldehyde gas in polluted air into harmless H 2 O and CO 2 The invention is suitable for removing formaldehyde pollution in closed and semi-enclosed spaces such as wood-based panel production workshops, living rooms, and building materials and furniture markets, and belongs to the technical fields of environmental materials, environmental catalysis, and environmental protection. Background technique [0002] The problem of formaldehyde pollution in indoor and closed systems has aroused great concern from all walks of life. Studies have shown that formaldehyde, as a highly toxic substance, can irritate the eyes, nasal cavity and respiratory tract in short-term exposure and cause allergic reactions, and long-term exposure can increase the possibility of cancer. For this reason, formaldehyde has been identified as carcinogenic an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/025B01J21/16A61L9/22A61L9/00
Inventor (请求不公开姓名)
Owner SUZHOU IND PARK ANZEWEN ENVIRONMENTAL PROTECTION TECH
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