What Are the Key Types of Catalysts Used in Emission Control?
Several types of catalysts are employed in emission control technologies:
Three-way catalysts (TWC): Used primarily in gasoline engines to control carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). Diesel oxidation catalysts (DOC): Used in diesel engines to oxidize pollutants like CO and unburned hydrocarbons. Selective catalytic reduction (SCR): Utilizes ammonia or urea to reduce NOx emissions to nitrogen and water. Lean NOx traps (LNT): Adsorbs NOx under lean conditions and reduces it during fuel-rich periods.
