Ceramic catalytic converters hold the biggest market and account for the majority of catalytic converters fitted. They are made from synthesized cordierite which is shaped into a honeycomb structure with square or triangular passageways.
These structures are then coated in aluminum oxide, and a layer containing platinum, palladium, and rhodium to be used as catalysts in the conversion process. Toxic gases move through the structure and are converted into less harmful gases to be released into the atmosphere.
Ceramic catalytic converters have mostly replaced pellet converters. Ceramic catalytic converters get recycled for their precious metal content