Catalyst for decomposing formaldehyde and preparation method of catalyst

Abstract

The invention provides a catalyst for decomposing formaldehyde and a preparation method of the catalyst. According to the catalyst for decomposing formaldehyde, a carrier of the catalyst is activatedcarbon, and the active components of the catalyst are platinum and palladium loaded on the carrier; the catalyst further contains a hydrophobic component which is a hydrophobic porous material layer packaging the surface of the catalyst, wherein the loading capacity of platinum is 0.02wt%-0.3wt%, and the loading capacity of palladium is 0.02wt%-0.3wt%. The preparation method of the catalyst is simple; and the prepared catalyst has the advantages of low cost, high wet fastness, adsorbability and activity and long service life, is capable of adsorbing and decomposing formaldehyde gas at the roomtemperature and can be applied to air purifiers and adsorption concentration towers, and formaldehyde concentration can be remarkably and rapidly reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a catalyst for decomposing formaldehyde and a preparation method thereof. Background technique [0002] With the continuous improvement of people's material and cultural level, people's requirements for outdoor and indoor air quality are getting higher and higher. A large number of materials used in interior decoration emit harmful gases, including formaldehyde. Formaldehyde is widely sourced from indoor building materials, textile products, incomplete combustion, and daily necessities, etc. It can coagulate and denature proteins in cells, and cause human respiratory system, immune system, central system, and nervous system. It has the characteristics of long release period and great harm, so it is of great significance to study the decomposition of formaldehyde. [0003] At present, indoor formaldehyde decomposition technologies include natural traditional method, adsorption m...

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Problems solved by technology

[0004] CN102658115A discloses a cerium-doped nano-titanium dioxide / activated carbon fiber composite photocatalyst for air purification and a preparation method thereof. The method achieves the purpose of improving the photocatalytic activity of nano-titanium dioxide by doping nano-titanium dioxide with rare earth cerium, but the method exists Need external excitation light source, low utilization efficiency of visible light, easy deactivation of catalyst and other problems

[0006] CN102247842A discloses a high-efficiency catalyst for eliminating formaldehyde at room temperature, which can efficiently decompose low-concentration formaldehyde under normal temperature and humidity. 2 -SnO 2 Composite oxide cordierite honeycomb ceramic carrier, the combination between the catalyst composite oxide and honeycomb ceramic is weak, easy to fall off, long-term use has problems such as severe catalyst powder loss, unstable activity, etc.

[0007] CN101274281A discloses a catalyst for removing formaldehyde in the air at room temperature and its preparation method. The cordierite honeycomb ceramics of Co-Ce-Sn porous composite oxide is used as a carrier, loaded with 0% to 10% of Pt, and can be oxidized and decomposed at room temperature Formaldehyde, but there is a problem of high cost

[0008] CN105749974A discloses a formaldehyde degradation catalyst and a preparation method thereof, which is mainly composed of nano-gold with a mass fraction of 0.1% to 0.5% and nano-platinum with a mass fraction of 0.1% to 0.5% loaded in a covalent organic porous polymer matrix COP-4 It improves the dispersion of active components on the porous carrier, but it has the disadvantages of complicated preparation process and poor conductivity.

[0009] CN105597682A discloses a method for preparing modified activated carbon for removing formaldehyde at normal temperature. The modified activated carbon uses granular, columnar, spherical or honeycomb high specific surface area coconut shell activated carbon as a carrier, and uses CuCl 2 and FeCl 3 Mixed metal salts are modified components, which have the characteristics of fast capture, high-efficiency adsorption, low cost, and easy industrialization of gaseous formaldehyde, but there is a problem of low formaldehyde conversion rate

[0010] Based on the above existing technologies, activated carbon has the advantages of wide source of raw materials, simple preparation process, low cost, and environmental protection benefits, but the existing carbon-supported catalysts have the disadvantages of easy adsorption saturation, difficult regeneration, and easy water poisoning. The research on the hydrophobicity and regenerative ability has practical significance

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