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Room-temperature catalytic oxidizing agent of formaldehyde employing composite noble metal alloy, and preparation method thereof

A precious metal and oxidant technology, used in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of slow decomposition of formaldehyde, limited market application, and high consumption of precious metals , to achieve the effect of fast decomposition of formaldehyde, great market application potential and simple production process

Active Publication Date: 2013-10-23
阜阳中科众汇净化材料有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned inventions solve the problem of formaldehyde catalytic oxidation at room temperature well, but they all use a single noble metal as the active center, and the amount of noble metal is high, especially the use of noble metal platinum in a large amount, resulting in high catalyst cost, which limits the market application, and has formaldehyde Defects of slow decomposition and short service life

Method used

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  • Room-temperature catalytic oxidizing agent of formaldehyde employing composite noble metal alloy, and preparation method thereof
  • Room-temperature catalytic oxidizing agent of formaldehyde employing composite noble metal alloy, and preparation method thereof

Examples

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example 1

[0029] Example 1: Content 0.1%Pt-Ce / TiO 2 preparation.

[0030] Dissolve dinitrosodiamine platinum and cerium nitrate in deionized water at the same time, stir at 60°C for 2 hours at high speed, slowly add nano-titanium dioxide slurry, stir at high speed for 1 hour, slowly add KOH solution dropwise, stir at high speed for 1 hour, and dry by rotary evaporation , dried at 120°C, baked at 400-600°C for 2 hours, passed through H 2 After 2 hours of reduction, the composite precious metal alloy formaldehyde catalytic oxidizer is obtained.

[0031] Similar methods can be used to prepare 0.2%Pt-Ce / TiO 2 , 0.3%Pt-Ce / TiO 2 , 0.4%Pt-Ce / TiO 2 , 0.5%Pt-Ce / TiO 2 catalyst.

example 2

[0032] Example 2: Preparation of content 0.5%Pd-Zr / TiO2.

[0033] Select palladium tetrachloride and zirconium nitrate to be dissolved in deionized water at the same time, stir at 60°C for 2 hours at high speed, slowly add nano-titanium dioxide slurry, stir at high speed for 1 hour, slowly add KOH solution dropwise, stir at high speed for 1 hour, spin dry, 120 Dry at ℃, bake at 400-600℃ for 2 hours, pass H 2 After 2 hours of reduction, the composite precious metal alloy formaldehyde catalytic oxidizer is obtained.

example 3

[0034] Example 3, content 1% AU-La / TiO 2 preparation of

[0035] Dissolve gold tetrachloride and lanthanum nitrate into deionized water at the same time, stir at 60°C for 2 hours at high speed, slowly add nano-titanium dioxide slurry, stir at high speed for 1 hour, slowly add KOH solution dropwise, stir at high speed for 1 hour, spin dry, 120 Dry at ℃, bake at 400-600℃ for 2 hours, pass H 2 After 2 hours of reduction, the composite precious metal alloy formaldehyde catalytic oxidizer is obtained.

[0036] In the test experiment of the present invention, adopt a rated wind volume 150m 3 / h purification device, the size of the formaldehyde catalytic oxidation module assembly is 300×300×10mm, and a total of 60g of catalyst powder is coated.

[0037] PTR-MS proton transfer mass spectrometer and INNOVA1312 gas multi-point sampling detector were used to test the product. At 15°C, the data are shown in Table 1, showing that formaldehyde is converted into carbon dioxide and water, ...

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Abstract

The invention discloses a room-temperature catalytic oxidizing agent of formaldehyde employing a composite noble metal alloy and a preparation method thereof. The catalyst is prepared by adopting a composite noble metal alloy as an active center, and compound crystalline nano-titanium dioxide as a carrier, wherein the composite noble metal alloy is an alloy active center which is compounded by noble metal and a rare earth element; the preparation method comprises the following steps of: selecting a salt solution containing the noble metal and a salt solution containing the rare earth element to dissolve into deionized water; slowly dropwise adding a KOH solution, carrying out high-speed agitation, rotary steam drying and baking; and roasting at the temperature of 400-600 DEG C and then leading in hydrogen to reduce, so as to obtain the room-temperature catalytic oxidizing agent of formaldehyde. By adopting the room-temperature catalytic oxidizing agent and the preparation method thereof, the catalytic activity is greatly improved; the formaldehyde is rapidly oxidized into carbon dioxide and water in a room-temperature condition namely when the temperature is 5-25 DEG C, so that the dosage of platinum metal is greatly reduced; and the room-temperature catalytic oxidizing agent has the advantages of simple process, low cost, good performance, fast decomposition velocity of formaldehyde and long service life, and can be widely applied to the equipment such as air conditioning equipment, a ventilating duct, a fresh air ventilator, an air purifier, an air humidifier and the like.

Description

technical field [0001] The invention belongs to the purification technology of formaldehyde pollutants in indoor air, and specifically relates to a room-temperature composite precious metal alloy formaldehyde catalytic oxidizer and a preparation method thereof. [0002] Background technique [0003] Formaldehyde is a typical indoor gas pollutant, most of which are volatilized from interior decoration materials. The binders used in large quantities in wood-based panels are the main source of formaldehyde, and its volatilization cycle may be as long as several years, or even more than ten years. Formaldehyde is extremely harmful to the human body, causing respiratory diseases and possibly cancer. my country's "Indoor Air Quality Standard" GB / T 18883-2002 clearly stipulates that the indoor formaldehyde concentration is less than 0.1mg / m 3 , and more than 60% of the newly renovated houses exceed the standard formaldehyde, and the formaldehyde pollution is very serious. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J23/63B01D53/86B01D53/72
Inventor 不公告发明人
Owner 阜阳中科众汇净化材料有限公司
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