Catalysis technique for high-efficiency, moisture-resistance and room-temperature formaldehyde removal

A catalytic technology, a room temperature technology, is applied in the above-mentioned nanomaterials, nanomaterial preparation, and high-efficiency moisture-resistant room temperature removal of formaldehyde in the field of catalysis, which can solve the problems of expensive catalysts, and achieve excellent economy, good long-term performance, and excellent removal ability. Effect

Active Publication Date: 2011-11-16
上海复翼环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Catalysis technique for high-efficiency, moisture-resistance and room-temperature formaldehyde removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Hollandite-type MnO with Ag-containing channels 2 Matrix (Ag 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. Add a certain concentration (≤25wt.%) of ammonia water to the silver nitrate solution (AgNO 3 ) to form silver ammonia (Ag(NH 3 ) 2 + ) solution. Under vigorous stirring, a certain concentration (≤30wt.%) of hydrogen peroxide (H 2 o 2 ) and silver ammonia (Ag(NH 3 ) 2 + ) solution was added dropwise to the above-mention...

Embodiment 2

[0043] Ag(K) 0.3 [Zn 2 mn 6 ]O 16 Preparation of monolithic catalytic materials. Weigh a certain amount of Ag(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, and obtain a certain concentration of doped Ag(K) 0.3 [Zn 2 mn 6 ]O 16 slurry. The doped Ag(K) 03 [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 Ag(K) 0.3 [Zn 2 mn 6 ]O 16 monolithic catalytic material. Recorded as "integral Ag(K) 0.3 [Zn 2 mn 6 ]O 16 ".

[0044] The formaldehyde performance test of monolithic catalytic materials was carried out on a fixed bed. The three-dimensional of monolithic 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 infra...

Embodiment 3

[0046] doped Ag(K) 0.3 [Zn 2 mn 6 ]O 16 The matrix-loaded Pt was prepared by gas phase reduction method: the above-mentioned loaded Ag(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 Ag(K) 0.3 [Zn 2 mn 6 ]O 16 The monolithic material is impregnated in a certain concentration of AgNO 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, recorded "Pt / Ag(K) 0.3 [Zn 2 mn 6 ]O 16 ". The content of the metal was analyzed by ICP, where Pt and doped Ag(K) 0.3 [Zn 2 mn 6 ]O 16 The matrix ratio is 0...

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Abstract

The invention provides a catalysis technique for high-efficiency, moisture-resistance and room-temperature formaldehyde removal and relates to the field of catalysis and environment protection. The technique is characterized in that: a honeycomb ceramic is used as a carrier, first-loaded hollandite type crystalline manganese dioxide with silver-doped pores is used as a substrate, and second-loaded platinum (Pt) is used as an active component. The doped hollandite type crystalline manganese dioxide substrate is characterized in that: the general chemical formula is represented by Agx(A)y[MzMn8-z]O16; M may be Mg<2+>, and Zn<2+>; A may be K<+> and H<+>; x is less than or equal to 2; y is less than or equal to 2; z is less than or equal to 3; [MzMn8-z]O16 represents the skeleton composition of the hollandite type MnO2; AND Agx(A)y represents the pore composition of the MnO2. The weight ratio of Pt to doped MnO2 ranges from 0 to 10 percent. The integrated catalyst provided by the invention can be used for stably and radically removal formaldehyde from the air with high efficiency in a real environment at normal temperature and normal humidity; the integrated catalyst does not exert any adverse and side effects on human bodies and can be widely used in the preparation of various air purifier for removing formaldehyde.

Description

technical field [0001] The invention is a catalytic 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 channels are first loaded with silver 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 [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01D53/86B01D53/72
Inventor 不公告发明人
Owner 上海复翼环保科技有限公司
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