Catalytic exhaust gas purification is a process used in industry to reduce pollutants in exhaust gases through chemical reactions on a catalyst. 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 the catalyst itself being consumed. Typically, the catalysts for exhaust gas purification consist of precious metals such as platinum, palladium or rhodium, which are applied to a carrier material (e.g. ceramic).

Applications

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 catalysts for combustion engines.

Advantages

Reduction of air pollutants and compliance with legal emission limits.

Protecting the environment and improving 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 catalysts are necessary.

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