The catalyst used in catalytic converters is finely dividedans.PtNiFePd 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 catalysts that promote chemical reactions.

The catalysts used in catalytic converters are typically precious metals. These include:

1. Platinum (Pt)
2. Palladium (Pd)
3. Rhodium (Rh)

Sometimes, other metals like nickel (Ni) and iron (Fe) are used, but they are not as common. The metals are finely divided to increase their surface area and maximize their effectiveness.

So, the answer to your question is Platinum (Pt), Palladium (Pd), and sometimes Nickel (Ni) and Iron (Fe).