Loaded integral catalyst for catalytic oxidation of formaldehyde and preparation method thereof

Abstract

The invention discloses a loaded integral catalyst for catalytic oxidation of formaldehyde and a preparation method thereof. The catalyst is of a mesoporous-macroporous hierarchical-pore structure, and a block graphene integral carrier is good in mechanical performance and less prone to being broken; through an electrolytic deposition method, Pt nanoparticles are uniformly loaded on the surface ofthe carrier, then K2CO3 is used to modify Pt, so that proportion of Pt(O) / Pt(O)+PtOx is increased, low-temperature catalytic activity of the catalyst can be lowered effectively, and catalytic activity of the catalyst is far higher than that of similar powdery catalysts; through a hydrothermal method at temperature higher than 300 DEG C, the forming problem of graphene is solved effectively, and mass transfer rate of the catalyst in gaseous-solid phase reaction is increased.

Description

technical field [0001] The invention belongs to the field of environmental protection and treatment of air formaldehyde pollutants, and in particular relates to a supported monolithic catalyst for catalytic oxidation of formaldehyde and a preparation method thereof. Background technique [0002] Formaldehyde is a highly volatile organic compound, a colorless and irritating gas. Indoor formaldehyde mainly comes from building materials, interior decoration materials and fuel combustion. The toxic effects of formaldehyde on the human body are mainly reflected in respiratory toxicity, immune toxicity, neurotoxicity, Cardiovascular toxicity and carcinogenicity, etc. People spend most of their lives indoors, and indoor formaldehyde has become a high-risk toxic substance that must be strictly eliminated and controlled. [0003] At present, the methods for processing formaldehyde mainly include biodegradation, physical or chemical absorption, and catalytic combustion, etc.: (1) Biol...

AI Technical Summary

Problems solved by technology

For transition element noble metal catalysts, the d electron orbitals are not filled, the surface is easy to adsorb reactant gas molecules, and the strength is moderate, which is conducive to the formation of an "active compound" intermediate state, showing high catalytic activity, and becoming an important catalyst. Active components, but the Pt-based catalysts currently studied are mainly in powder state, and the carrier is also mainly powder or granules, and the problems existing in the application process of powder or granule catalysts are: (1) Loading and unloading is troublesome (2) It is not easy to form and the mechanical strength cannot meet the requirements; (3) Mass transfer and heat transfer are greatly hindered, which reduces the processing efficiency; (4) The difference in pressure drop between the front and back of the catalyst bed is large, which increases energy consumption. Belonging to heterogeneous catalytic reactions, the process includes seven steps

[0006] Graphene is a new type of nanomaterial with the thinnest, strongest electrical conductivity, thermal conductivity, and optical properties found so far (such as pure graphene materials, the surface area can reach 2000-4000m 2 / g) is a promising catalyst carrier, therefore, a large number of catalysts with graphene as a dopant as a carrier, or pure graphene powder as a carrier, have appeared and are used in gas-solid phase reactions , but seldom use graphene block monoliths as carriers to support active components for catalysis. The main reason is that it is difficult to directly prepare graphene monolith structures with better mechanical properties in the prior art, that is, graphene blocks are easy Broken into powder, which cannot meet the requirements of industrial machinery

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