What is inside a three-way catalytic converter?

[DiCharles]

A three-way catalytic converter contains porous ceramic materials and is installed in the exhaust pipe. The three-way catalytic converter is the most important external purification device in a vehicle's exhaust system. Its working principle is: when high-temperature exhaust gases pass through the purification device, the purifying agents in the three-way catalytic converter enhance the activity of CO, HC, and NOx gases, promoting certain oxidation-reduction chemical reactions. The methods for cleaning a three-way catalytic converter are: 1. Add cleaning agent to the fuel tank; 2. Use a hanging bottle cleaning method, where the cleaning agent is drawn into the combustion chamber through the intake vacuum suction and burned, achieving the purpose of restoring the activity of the three-way catalytic converter through oxidation-reduction reactions inside it; 3. Disassemble and clean by removing the three-way catalytic converter, soaking it in oxalic acid and toilet cleaner, and then rinsing it with clean water.

[DelDominic]

As an automotive enthusiast fascinated by car structures, I can tell you that the core of a three-way catalytic converter is a honeycomb-shaped ceramic substrate, typically made of cordierite material, coated with a catalyst layer containing precious metal particles such as platinum, palladium, and rhodium. These metal particles trigger chemical reactions when high-temperature exhaust gases pass through: oxidizing carbon monoxide into carbon dioxide, converting unburned hydrocarbons into water vapor and carbon dioxide, and reducing nitrogen oxides into harmless nitrogen gas. This entire process significantly reduces the harmfulness of exhaust emissions, protecting the environment. The ceramic structure is fragile and can easily be clogged or damaged by engine carbon deposits or sulfur compounds in low-quality fuel. If it fails, the dashboard emission light will illuminate, and the car will experience poor acceleration, necessitating prompt repairs. Maintenance recommendations include using unleaded gasoline and avoiding prolonged idling to prevent carbon buildup. The design was originally intended to enable modern cars to run cleaner, and we car owners must also take responsibility to ensure it functions properly.

[ElisaMarie]

As a seasoned driver who frequently deals with car repairs, I must say the three-way catalytic converter contains a ceramic honeycomb or small ball structure coated with precious catalysts like platinum, palladium, and rhodium. These catalysts are responsible for purifying toxic substances in the exhaust. Once clogged or damaged by poor-quality fuel corrosion, the car struggles to breathe: sluggish acceleration, increased fuel consumption, and even triggering the malfunction indicator lamp in severe cases. I once experienced a repair due to sulfur-rich low-quality gasoline poisoning the coating—upon disassembly, the ceramic was found shattered. Daily prevention is key: use high-grade fuel, avoid speeding to prevent overheating, don't let the car idle cold for too long, and keep the exhaust pipe clean to extend its lifespan. Ignoring issues not only risks failing annual inspections and potential fines but also leads to costly part replacements (thousands spent). Regular checks save hassle, ensure safety, and reduce environmental impact.

[SanAlyssa]

From the perspective of an environmentally conscious ordinary car owner: The three-way catalytic converter contains a ceramic honeycomb structure coated with platinum, palladium, and rhodium particles. It catalyzes the purification of exhaust gases, converting carbon monoxide to carbon dioxide, nitrogen oxides to nitrogen, and hydrocarbons to water vapor, making urban air cleaner with less smog. Poor maintenance, such as fuel contamination causing blockages, can lead to excessive emissions that harm health. In daily driving, use high-quality fuel and conduct regular inspections. Do not remove it, as this carries legal risks and negatively impacts global climate. We should actively support green transportation.