Ag/MnO2 catalyst, preparation method thereof, and application of same in removing formaldehyde at room temperature

Abstract

The invention particularly relates to an Ag / MnO2 catalyst, a preparation method thereof, and an application of the Ag / MnO2 catalyst in removing formaldehyde at room temperature. The preparation method comprises the following steps: (1) adding ammonium oxalate and a silver precursor into a potassium permanganate solution, and uniformly stirring and mixing to obtain a mixed solution; (2) carrying out hydrothermal reaction on the mixed solution obtained in the step (1), and after the reaction is completed, carrying out suction filtration, washing and drying treatment on a reaction product to obtain powder; and (3) carrying out a reduction reaction on the powder obtained in the step (2) in a hydrogen atmosphere to obtain the Ag / MnO2 catalyst. The method is simple, environment-friendly and easy for industrialization. In the prepared catalyst, Ag is in atomic-scale dispersion on the surface of the MnO2 carrier, so that the atom utilization rate reaches 100%. The catalyst can completely convert formaldehyde into non-toxic carbon dioxide and water under the conditions of normal temperature and normal humidity under the condition of relatively low noble metal loading capacity; the catalyst has the advantages of long service life and high stability, and is suitable for degrading formaldehyde generated in rooms and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic environmental protection catalytic materials, in particular to an Ag / MnO 2 Catalyst and its preparation method and application in room temperature removal of formaldehyde. Background technique [0002] With the rapid development of social economy and the gradual improvement of people's living standards, people's requirements for environmental protection and air quality are becoming more and more stringent. Among them, formaldehyde is the most serious indoor pollution. Low-concentration formaldehyde can irritate the eyes and mucous membranes of the respiratory tract of the human body, causing abnormalities in the liver system, respiratory system and nervous system; and long-term exposure to high-concentration formaldehyde can lead to the occurrence of various cancers. The Institute for Cancer Research has defined formaldehyde as a class 1 carcinogen. Therefore, how to efficiently remove formald...

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Problems solved by technology

Chinese patent CN106391007A uses a colloidal deposition method to prepare a catalyst with a highly stable spinel structure oxide as a carrier and a noble metal as an active component. It can be used to catalyze the elimination of CO and formaldehyde under normal temperature and humidity conditions, but the size of the metal particles is large. The problem of low atomic utilization of active components

Chinese patent CN102240549A uses honeycomb ceramics as the carrier, the hollandite-type crystal structure manganese dioxide (MnO2) loaded with silver-doped pores as the matrix, and platinum (Pt) as the active component, which can be used in real environments at room temperature and humidity. It can efficiently, stably and thoroughly remove formaldehyde in the air, but the preparation process is complicated, and the cost of raw materials is high, so it is not easy to industrialize

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