The Principle of VOCs gas catalytic purification

Overview of VOCs

VOCs are a general term for organic compounds that easily volatilize at room temperature, mainly originating from industrial processes such as petrochemicals, paint coating, and printing. Typical components include benzene, toluene, xylene, and other benzene series compounds, as well as formaldehyde, ketones, and esters. These substances not only participate in photochemical reactions to generate ozone and PM2.5, but also pose direct harm to human health; some components, such as benzene and formaldehyde, have been proven to be carcinogenic. Therefore, effective treatment of industrial VOCs is crucial.

Structural Characteristics of Honeycomb Ceramics

Faced with the need for VOCs treatment, catalytic combustion technology has become the preferred choice due to its high efficiency and energy saving. The core of this technology is the catalyst carrier, and honeycomb ceramics, with their large geometrical surface area, low airflow resistance, and excellent thermal and chemical stability, are the ideal choice.

Detailed Explanation of the Purification Process

The purification of VOCs within honeycomb ceramics is essentially a catalytic oxidation process, which can be divided into three continuous stages:

1. Reactant Diffusion and Adsorption

VOCs waste gas enters the parallel channels of the honeycomb ceramics under the action of a fan. VOCs molecules and oxygen in the waste gas diffuse from the main gas flow to the catalyst surface and are adsorbed onto the active sites of the catalyst.

2. Surface Catalytic Reaction

The adsorbed VOCs molecules are activated under the action of a catalyst (usually a noble metal or metal oxide), and their chemical bonds are weakened and broken. After reaching the ignition temperature (300-500℃), a complete oxidation reaction occurs with oxygen:

VOCs + O2 → CO2 + H2O + Heat

3. Product Desorption and Diffusion

The carbon dioxide and water vapor generated in the reaction desorb from the catalyst surface and diffuse back into the gas flow to be discharged from the system. The heat of reaction released simultaneously helps maintain the system operating temperature and reduces additional energy consumption.

Technical Advantages

Catalytic combustion technology based on honeycomb ceramics has the following significant advantages:

High purification efficiency, typically above 98%

Reaction temperature is much lower than direct combustion, resulting in low energy consumption

Safe process with no open flame and no secondary pollution

Summary

Honeycomb ceramics, through their unique structure, provide an ideal reaction site for the catalytic oxidation of VOCs, making them key to achieving high-efficiency purification. This technological combination has become one of the most reliable and economical solutions for industrial VOCs treatment.

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