A kind of preparation method of aldehyde removal catalyst

Abstract

The invention relates to a preparation method of an aldehyde-removing catalyst, comprising the following steps: (1) dispersing graphene oxide in deionized water, then adding an aqueous solution of sodium carbonate dropwise thereto, and adjusting the pH value of the solution to 9-10, which is recorded as Solution A; (2) Disperse metal salt and complexing agent in deionized water, then add platinum precursor solution, stir evenly, record as solution B; (3) add solution B to solution A, stir evenly to form Solution C; (4) move solution C into a hydrothermal kettle, and keep it warm at 90-200°C for 8-24 hours; (5) separate solid-liquid from the heated solution C obtained in step (4), and freeze the separated solid substance drying; (6) calcining the dried solid matter obtained in step (5) at 200-500° C. for 1-4 hours in a nitrogen atmosphere to obtain the catalyst. In the preparation process, the present invention completes carrier preparation and impregnation loading in one step, which reduces the process and saves time and energy.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a preparation method of an aldehyde-removing catalyst. Background technique [0002] With the changes in people's living conditions and working methods, people spend most of their time indoors nowadays, so indoor air quality is very important. As we all know, formaldehyde is a major pollutant that causes indoor air pollution. Wall coatings, artificial panels, textiles, decoration accessories, and some human activities will release formaldehyde, making indoor air quality worse. Long-term exposure to an environment containing formaldehyde can cause serious harm to people's health, such as acute poisoning, decreased immunity, chronic poisoning, decreased blood cell count, infertility, fetal malformation, chromosomal aberrations, cancer, etc. Therefore, the removal of indoor formaldehyde is very important. [0003] So far, the commonly used methods for indoor f...

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Problems solved by technology

For example, the Chinese invention patent application whose patent number is CN201610998254.6 (publication number is CN107999090A) discloses "A Method for Preparation of Nanocomposite Catalytic Material for Oxidizing Formaldehyde at Room Temperature", firstly obtain iron oxide by hydrothermal method, and then dry it Disperse, impregnate noble metal salt, and then carry out reduction treatment, but the iron oxides obtained are seriously agglomerated (as can be seen from the accompanying drawings), resulting in uneven dispersion of noble metal active components. For the formaldehyde catalytic reaction, the specific surface area of ​​the catalyst is higher. Larger, the more reactive active sites are exposed, the higher the catalytic activity, and the metal oxide supports are mostly nanomaterials. If they are agglomerated during the preparation process, the specific surface area of ​​the catalyst will be reduced to a certain extent, and the obtained noble metal nanomaterials The dispersion of the particles is low, which reduces the effective utilization of precious metals, and the catalytic material cannot show the optimal catalytic activity; and the preparation is divided into two processes: carrier preparation and impregnation loading. First, the metal oxide carrier is prepared, and then dried. Then impregnate the platinum source, and then carry out the steps of drying, roasting, reduction and activation, etc. The process is more complex and cumbersome, which causes waste of time and energy in actual production, and increases the cost.

[0005] Another example is the "Preparation Method of a Pt / Graphene Oxide / Fe2O3 Catalyst that Enhances the Activity of Catalytic Oxidation of Formaldehyde at Room Temperature" disclosed by the Chinese invention patent application whose patent number is CN201610998254.6 (publication number is CN106513013A). Graphene oxide is introduced into the material, but it is only a physical mixture of graphene oxide and pre-prepared ferric oxide by stirring, there is no strong interaction between the two, and the introduction of graphene does not improve the metal oxidation. dispersion of matter

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