Catalytic exhaust gas purification is a process used in industry to reduce pollutants in exhaust gases through chemical reactions on a catalyst. In this process, harmful substances such as nitrogen oxides (NOₓ), carbon monoxide (CO), volatile organic compounds (VOCs) and particles are converted into less harmful compounds such as nitrogen (N₂), carbon dioxide (CO₂) and water (H₂O).

The catalyst is a surface on which chemical reactions are facilitated without consuming the catalyst itself. Typically, catalysts for exhaust gas purification consist of precious metals such as platinum, palladium or rhodium, which are applied to a support material (e.g. ceramic).

Areas of application

Power plants: Cleaning of flue gases from the combustion of fossil fuels.

Chemical industry: Exhaust gas purification in production processes.

Waste incineration plants: Reduction of pollutants from waste incineration.

Automotive industry: Three-way catalytic converters for internal combustion engines.

Advantages

Reduction of air pollutants and compliance with legal emission limits.

Environmental protection and improved air quality.

Effective and continuous cleaning of large exhaust gas flows.

Disadvantages

High investment and operating costs.

Catalysts can be poisoned by impurities (e.g. sulfur or heavy metals).

Regular maintenance and replacement of the catalytic converters are necessary.

Catalytic exhaust gas purification is a key technology for complying with environmental regulations and reducing the environmental impact of industrial processes.