Three-way catalysts (TWC) play a central role in the exhaust gas treatment of engines operated under stoichiometric conditions at a lambda value of approximately 1. TWC catalysts consist of the precious metals platinum, palladium, and rhodium and fulfill three main functions: they oxidize carbon monoxide (CO) and unburned hydrocarbons (HC) while simultaneously reducing nitrogen oxides (NOₓ).
Platinum and palladium are responsible for the oxidation of CO and HC residues, whereas rhodium is specifically used for the reduction of NOₓ. The catalysts are typically integrated into honeycomb structures mounted on a metallic substrate. This design ensures high temperature resistance, stability, and a large contact surface area for the exhaust gas streams.
The expert team at C&CS supports you in the design of TWC catalysts and advises on achieving optimal conversion performance for CO, residual VOCs, and NOₓ. The catalysts are supplied in suitable cone housings that can be adapted to your plant conditions. Single- or double-cone stainless steel housings, together with the TWC catalysts, form a compact and robust system.
While platinum-based oxidation catalysts are primarily used in stationary engines operating with excess oxygen, TWC catalysts are the preferred solution for engines without excess oxygen in order to ensure comprehensive exhaust gas purification.
