Preparation method of heating radiator coating layer for precious metal formaldehyde eliminating agent

Abstract

The invention relates to a preparation method of a heating radiator coating layer for a precious metal formaldehyde eliminating agent. Pt is controlled by fluorine ions so as to cover the surface of Pd in a PdPt core-shell structure through replacement reaction between Pd and Pt, and the reduction is carried out under a heating condition without adopting a surfactant and a temperate through selective adsorption of the fluorine ions, so that the deposition state of Pt atoms on the surface of Pd is controllable. According to the preparation method, the surface controllability of precious metal nano-particles is realized, the operation is relatively simple and convenient, and the synthesis scale is suitable for being amplified; and compared with Pt catalysis, a catalyst has the characteristics of relatively low cost and rich resources. A formaldehyde eliminating coating layer prepared by virtue of the method has a very large specific surface area and is capable of catalyzing the oxidationof formaldehyde at about 40 DEG C by virtue of the heat of a heating radiator so as to generate carbon dioxide and water; and the catalysis coating layer is arranged at the bottom of the heating radiator, so that cold air can be automatically supplemented to the surface of the catalysis coating layer after hot air flows upwards, and formaldehyde carried by cold air can be catalyzed and oxidized into innocuous substances.

Description

technical field [0001] The invention belongs to the technical field of indoor air purification, and in particular relates to a preparation method of a radiator coating of a precious metal formaldehyde eliminating agent. Background technique [0002] Formaldehyde is a common pollutant in the indoor atmosphere, and it has high toxicity. Short-term exposure to low concentrations of formaldehyde can irritate the eyes and respiratory tract and cause allergic reactions, and long-term exposure to trace amounts of formaldehyde can increase the possibility of cancer. Formaldehyde has been identified as a teratogenic and carcinogenic substance by the World Health Organization. The "Indoor Air Quality Standard" (GB / T18883-2002), which was implemented in my country in 2003, stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.10 mg per cubic meter (1 hour average). In summer in the north, windows can be opened to use air convection to discharge formal...

AI Technical Summary

Problems solved by technology

① Adsorption method is the most commonly used method to eliminate formaldehyde. This method uses strong adsorptive materials with large specific surface area to absorb formaldehyde. For example, the commonly used strong adsorptive materials with large specific surface area are porous carbon materials, activated carbon, layered clay, Molecular sieve, activated alumina, silica gel, etc. This method is simple, but its disadvantage is that the adsorption capacity of the adsorbent is limited and needs to be replaced regularly, which increases the cost of eliminating formaldehyde; Interaction produces non-volatile substances, thereby removing formaldehyde from the purification object. For example, formaldehyde reacts with hydroxylamine sulfate aqueous solution to generate non-volatile sulfuric acid and oxime, and formaldehyde reacts with imidazolidine to generate non-volatile substances. This method requires regular replacement of active substances , not only increase the cost of eliminating formaldehyde, but also produce new potential pollutants; ③ photocatalytic method is to use titanium dioxide catalyst to oxidize and eliminate formaldehyde. It is oxidized to the product of carbon dioxide and water. The excess oxygen in the product comes from the oxygen molecules activated by photoelectrons. The disadvantage of this method is that it is difficult to deal with a large amount of formaldehyde due to the influence of light conditions; However, ozone and nitrogen oxides may be generated during the process, and the plasma equipment is expensive and energy-consuming; ⑤The catalytic combustion method refers to the oxidation of formaldehyde by oxygen molecules to form water and carbon dioxide under the condition of a catalyst, the usual transition Metal oxides can catalyze the oxidation of formaldehyde, but the complete oxidation temperature of formaldehyde is closely related to the type of catalyst

Its specification discloses Pt / TiO 2 The catalyst can efficiently oxidize formaldehyde completely at room temperature, but the catalyst uses a higher loading of the noble metal Pt, which has a higher cost, and Pt as a catalyst is easily oxidized by SO in the air. 2 , NO 2 Pollution inactivation