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Titanium oxide supported catalyst for eliminating formaldehyde in microenvironment air

A catalyst, titanium dioxide technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of expensive catalysts and other issues

Active Publication Date: 2011-11-23
上海复翼环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1698932A uses gold-loaded rare earth oxides or adsorbed Anatase-type titanium dioxide catalysts, 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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  • Titanium oxide supported catalyst for eliminating formaldehyde in microenvironment air
  • Titanium oxide supported catalyst for eliminating formaldehyde in microenvironment air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of Anatase-coated titanium dioxide cordierite honeycomb ceramic carrier: dissolve titanium tetrachloride in ethanol / deionized aqueous solution (wherein the molar ratio of ethanol and water is 2:20: add dropwise to the mixed solution under vigorous stirring An appropriate amount of ammonia water with a concentration of 0.20 mol / l, and finally adjust its pH value to 7-9; the obtained colloidal liquid mixture is subjected to ultrasonic treatment for 1 hour; after the sediment in the colloidal liquid mixture is centrifuged and washed with deionized water, Dry at 110° C. for 24 hours to obtain an Anatase-type titanium dioxide precursor, and then roast at 400° C. in air for 2 hours to obtain the desired Anatase-type titanium dioxide.

[0019] Weigh a certain amount of above-mentioned Anatase-type titanium dioxide with different contents, add a certain proportion of silica gel aqueous solution, and stir at a high speed for 3 hours to obtain a certain concentration o...

Embodiment 2

[0022] Preparation of the catalyst: the Anatase-type titanium dioxide cordierite honeycomb ceramic carrier coated with the Anatase type obtained in Example 1 was impregnated in Pt(NH 3 ) 2 (NO 2 ) 2 In the aqueous solution, the concentration of Pt-Au is 0.01mol / l. Take it out and dry it in the air at 110°C for 2 hours to obtain a loaded Pt-Au precursor, and then treat the loaded Pt-Au precursor at 200°C in pure hydrogen for 2 hours. The content of Pt-Au accounts for 1.0% of Anatase type titanium dioxide.

[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-Au contents: The Anatase-type titanium dioxide cordierite honeycomb ceramic carrier coated with Anatase type obtained in Example 1 was impregnated in Pt(NH 3 ) 2 (NO 2 ) 2 In the aqueous solution, the concentration of Pt-Au in the solution is adjusted so that the content of Pt-Au in the finished catalyst accounts for 0-5% of the Anatase type titanium dioxide. Take it out and dry it in the air at 110°C for 2 hours to obtain a loaded Pt-Au precursor, and then treat the loaded Pt-Au 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 provides an efficient catalyst capable of completely oxidizing low-concentration formaldehyde in air to carbon dioxide and water at room temperature and under normal atmospheric humidity, and a preparation method thereof. The catalyst is characterized by utilizing a cordierite honeycomb ceramic coated with an Anatase type TiO2 composite oxide as a carrier and 0-10% of Pt-Au as an active component. The catalyst is also characterized in that: the catalyst does not requires additional energy of light, heat or electricity, or chemical reagents, has a formaldehyde removal efficiency much higher than that of a photocatalysis and a plasma technology under conditions of large wind volume and high humidity, and has no auxiliary products. Therefore, the catalyst is suitable for removal of formaldehyde pollution in an artificial board production workshop, a room, enclosed or semienclosed space of automobile, etc.

Description

technical field [0001] The invention relates to a titanium oxide-supported catalyst for eliminating formaldehyde in micro-environmental air 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, 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 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. The "Air Quality Standard for Closed System" (GB / T18883-2002) promulgated by China stipulates that the hygienic standard (maximum allowable concentration) of formaldehyde in the air of a closed...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01D53/72B01D53/86
Inventor 不公告发明人
Owner 上海复翼环保科技有限公司
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