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High-efficiency catalyst for removing formaldehyde at room temperature

A catalyst, room temperature technology, applied at room temperature to eliminate pollution, can solve the problem of expensive catalysts and other issues

Inactive Publication Date: 2011-11-23
SHANGHAI NIUYI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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
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

Method used

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  • High-efficiency catalyst for removing formaldehyde at room temperature
  • High-efficiency catalyst for removing formaldehyde at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of Ti-Sn composite oxide cordierite honeycomb ceramic support: Dissolve titanium tetrachloride and tin tetrachloride in di-(2-ethylhexyl) sodium sulfosuccinate (AOT) / ethanol / in deionized aqueous solution (where the molar ratio of AOT, ethanol, and water is 2:20:40), according to the appropriate Ti-Sn molar ratio (see Table 1), mix the above three solutions, and drop them under vigorous stirring Add appropriate amount of H 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, dried at 110°C for 24h to obtain a composite oxide precursor, and then roasted in air at 400°C for 2h to obtain the desired Ti-Sn compo...

Embodiment 2

[0022] Preparation of the catalyst: the Ti-Sn composite oxide cordierite honeycomb ceramic support 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.

[0023] The performance test of the catalyst is the same as in Example 1. 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.

Embodiment 3

[0025] Preparation of catalysts with different Pt contents: the Ti-Sn composite oxide cordierite honeycomb ceramic carrier coated with Ti-Sn composite oxide 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 0-5% 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.

[0026] The performance test of the catalyst is the same as in Example 1. 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 relates to a high-efficiency catalyst for oxidizing low-concentration formaldehyde in indoor air into carbon dioxide and water at room temperature and normal humidity and a preparation method of the catalyst. The catalyst is characterized in that: cordierite honeycomb ceramic coated with TiO2-SnO2 composite oxide is taken as a carrier, and 0 to 5 percent of Pt is taken as an active ingredient. The catalyst has the advantages that: energy such as light, heat, electricity and the like and a chemical reagent are not required to be added, the formaldehyde removing efficiency is far higher than that of a photocatalysis technology and a plasma technology under the conditions of large air quantity, high humidity and the like, byproducts are not generated, and the catalyst is suitable for efficiently removing formaldehyde in closed or semi-closed spaces such as artificial board production workshops, living rooms, automobiles and the like.

Description

technical field [0001] The invention relates to a high-efficiency catalyst for eliminating formaldehyde at room temperature and a preparation method thereof, that is, to a method for completely oxidizing formaldehyde gas in the air into harmless carbon dioxide and water under room temperature and high humidity conditions, and is suitable for removing formaldehyde in wood-based panel production workshops, living rooms, Formaldehyde pollution in closed and semi-enclosed spaces such as building materials and furniture markets belongs to the technical fields of catalytic materials, environmental catalysis and environmental protection. Background technique [0002] The closed system and the formaldehyde pollution problem of the closed system have 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...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01D53/86B01D53/72
Inventor 不公告发明人
Owner SHANGHAI NIUYI NEW ENERGY TECH
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