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High-efficiency cold catalyst room temperature complete removal of formaldehyde technology

A room temperature, formaldehyde technology, applied to the above-mentioned nano-materials, high-efficiency humidity-resistant room-temperature catalyst for removing formaldehyde, nano-material preparation, can solve the problem of expensive catalysts, etc., to achieve excellent economy, good long-term performance, and high stability Effect

Active Publication Date: 2011-12-21
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

However, the high Pt content (12%) in the catalyst makes the price of the catalyst expensive, so this catalyst can only be used in some special occasions such as military industry or aerospace
Chinese patent CN1698932A uses gold-loaded rare earth oxides or adsorbed composite oxide 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Hollandite-type MnO with gold-bearing channels 2 Matrix (Au x (A) y [M z mn 8-z ]O 16 , A=K + , M=Zn 2+ or Mg 2+ ) preparation.

[0038] Powdered MnO 2 (P25), M salt (Zn(NO 3 ) 2 or Mg(NO 3 ) 2 ), template potassium nitrate (KNO 3 ) and organic matter P123 were mixed according to a certain amount, vigorously stirred and mixed evenly, dried at 100-150°C for 1-24h, then calcined at 900°C for 36h, washed after cooling, dried and calcined at 500°C for 24h to obtain skeleton-doped hollandite-type MnO 2 matrix.

[0039] The above hollandite type MnO 2 The matrix is ​​added to a certain amount of aqueous solution to form a suspension. A certain concentration (≤25wt.%) of ammonia water is added to the gold nitrate solution (AuNO 3 ) to form gold ammonia (Au(NH 3 ) 2 + ) solution. Under vigorous stirring, a certain concentration (≤30wt.%) of hydrogen peroxide (H 2 o 2 ) and gold ammonia (Au(NH 3 ) 2 + ) solution was added dropwise to the above-mentioned...

Embodiment 2

[0043] Au(K) 0.3 [Zn 2 mn 6 ]O 16 Preparation of monolithic catalyst materials. Weigh a certain amount of Au(K) 0.3 [Zn 2 mn 6 ]O 16 , add a certain proportion of deionized water and 30% silica gel adhesive, stir at high speed for 10h, get a certain concentration of doped Au(K) 0.3 [Zn 2 mn 6 ]O 16 slurry. The doped Au(K) 0.3 [Zn 2 mn 6 ]O 16 The slurry was coated on the pre-treated honeycomb ceramics, and fired at 500 °C for 12 hours to obtain doped Au(K) 0.3 [Zn 2 mn 6 ]O 16 Integral catalyst material. Recorded as "integral Au(K) 0.3 [Zn 2 mn 6 ]O 16 ".

[0044] The formaldehyde performance test of the monolithic catalyst material was carried out on a fixed bed. The three-dimensional size of the integral catalyst is 150*150*40mm 3 , and then put it into a glass tube, at room temperature (20°C) and relative humidity of 50%, pass through a solution containing 5.0mg / m 3 For formaldehyde air, the wind speed is 1.5m / s. The air purifier uses FMNR infrar...

Embodiment 3

[0046] Doped Au(K) 0.3 [Zn 2 mn 6 ]O 16 The matrix loaded Pt was prepared by gas phase reduction method: the above loaded Au(K) 0.3 [Zn 2 mn 6 ]O 16 Monolithic material (prepared by claim 6) is impregnated in nitrosodiamine platinum (Pt(NH 3 ) 2 (NO 2 ) 2 ) or chloroplatinic acid (H 2 PtCl 6 ) in the mixed solution, baked at 300°C for 4h after drying, and then in H 2 Reduction at 300°C for 4 hours in the atmosphere, or irradiating with a certain 254nm UV for 36 hours. Prepared by liquid phase reduction method: loading Au(K) 0.3 [Zn 2 mn 6 ]O 16 The monolithic material is impregnated in a certain concentration of AuNO 3 and Pt(NH 3 ) 2 (NO 2 ) 2 or H 2 PtCl 6 mixed solution, and then add the reducing agent NaBH 4 , reacted at room temperature for 4h, dried and baked at 300°C for 4h, and recorded "Pt / Au(K) 0.3 [Zn 2 mn 6 ]O 16 ". The content of the metal was analyzed by ICP, where Pt and doped Au(K) 0.3 [Zn 2 mn 6 ]O 16 The matrix ratio is 0 to 10...

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Abstract

The invention provides a high-efficiency humidity-resistance room-temperature formaldehyde removing catalyst technology, and relates to the field of catalyst and environmental protection. The technology is characterized in that: honeycomb ceramic adopted as a carrier first loads channel gold-doped hollandite type crystal structured manganese dioxide (MnO2) to serve as a substrate, and then loads platinum (Pt) as an active component, wherein the doped hollandite type MnO2 substrate is characterized in that: chemical general formula of the substrate can be shown as Aux(A)y[MzMn8-z]O16 (M is Mg2+ and Zn2+, A is K+ and H+, x is less than or equal to 2, y is less than or equal to 2, and z is less than or equal to 3, [MzMn8-z]O16 represents the framework composition of the hollandite type MnO2, and Aux(A)y represents the channel composition of MnO2; and the weight ratio of Pt to doped MnO2 is between 0 and 10 percent. The integral catalyst can effectively, stably and completely remove the formaldehyde in the air in a room-temperature constant-humidity real environment, has no adverse side effect to a human body, and thus can be widely applied to the preparation of various air purifiers to remove formaldehyde.

Description

technical field [0001] The invention is a catalyst technology for removing formaldehyde at room temperature with high efficiency and humidity resistance, and relates to the fields of environmental protection, air pollutant control, environmental protection and the like. It is characterized in that honeycomb ceramics are used as the carrier, and the pores are first loaded with gold manganese dioxide (MnO 2 ) as the substrate, and platinum (Pt) is loaded as the active component later. The catalyst of the technology of the present invention can efficiently and stably remove formaldehyde in the air in a real environment of normal temperature and humidity. [0002] The present invention also relates to the preparation method of the above-mentioned nanometer material. [0003] The invention also relates to the application of the above-mentioned nanometer material in the preparation of various environmental protection and air pollutant treatment. Background technique [0004] Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01D53/86B01D53/72
Inventor 不公告发明人
Owner 上海复翼环保科技有限公司
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