he catalyst used in catalytic converters is finely dividedans.PtPdNiFe Previous Marked for Review Next

It seems like you're asking about the catalyst used in catalytic converters. Catalytic converters are devices used in vehicles to reduce harmful emissions. They contain a core of ceramic honeycomb coated with a mix of precious metals.

The catalyst used in catalytic converters is typically a combination of platinum (Pt), palladium (Pd), and rhodium (Rh). Nickel (Ni) and iron (Fe) are not typically used in catalytic converters.

Here's a step-by-step breakdown:

1. Exhaust gases from the engine (containing pollutants like nitrogen oxides, carbon monoxide, and hydrocarbons) enter the catalytic converter.

2. These gases pass over the honeycomb core coated with the catalyst (Pt, Pd, Rh).

3. The catalyst triggers a chemical reaction. Nitrogen oxides are broken down into nitrogen and oxygen. Carbon monoxide and hydrocarbons are converted into carbon dioxide and water.

4. The treated exhaust gases (now less harmful) exit the catalytic converter and are released from the vehicle's exhaust pipe.