The catalyst used in catalytic converters is usually a combination of platinum (Pt), palladium (Pd), and rhodium (Rh). Nickel (Ni) and iron (Fe) are not typically used. Here's a step-by-step explanation:

1. Catalytic converters are devices used in vehicles to reduce harmful emissions. They do this by facilitating chemical reactions that convert these harmful gases into less harmful substances.

2. The catalysts used in these converters need to be able to withstand high temperatures and harsh conditions, and they need to be efficient at facilitating the necessary chemical reactions.

3. Platinum, palladium, and rhodium are all precious metals that are very effective catalysts. They are able to facilitate the necessary reactions at the high temperatures found in a car's exhaust system.

4. These metals are used in a finely divided form, which means they are dispersed over a large surface area. This increases their effectiveness, as it allows more of the gas to come into contact with the catalyst.

5. Nickel and iron, while they are also metals that can act as catalysts, are not typically used in catalytic converters. They are not as efficient as the platinum group metals, and they may not be able to withstand the harsh conditions as well.

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The catalyst used in catalytic converters is usually a combination of platinum (Pt), palladium (Pd), and rhodium (Rh). Nickel (Ni) and iron (Fe) are not typically used. Here's a step-by-step explanation:

1. Catalytic converters are devices used in vehicles to reduce harmful emissions. They do this by facilitating chemical reactions that convert these harmful gases into less harmful substances.

2. The catalysts used in these converters need to be able to withstand high temperatures and harsh conditions, and they need to be efficient at facilitating the necessary chemical reactions.

3. Platinum, palladium, and rhodium are all precious metals that are very effective catalysts. They are able to facilitate the necessary reactions at the high temperatures found in a car's exhaust system.

4. These metals are used in a finely divided form, which means they are dispersed over a large surface area. This increases their effectiveness, as it allows more of the gas to come into contact with the catalyst.

5. Nickel and iron, while they are also metals that can act as catalysts, are not typically used in catalytic converters. They are not as efficient as the platinum group metals, and they may not be able to withstand the harsh conditions as well.

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The catalyst used in catalytic converters is usually a combination of platinum (Pt), palladium (Pd), and rhodium (Rh). Nickel (Ni) and iron (Fe) are not typically used. Here's a step-by-step explanation:

1. Catalytic converters are devices used in vehicles to reduce harmful emissions. They do this by facilitating chemical reactions that convert these harmful gases into less harmful substances.

2. The catalysts used in these converters need to be able to withstand high temperatures and harsh conditions, and they need to be efficient at facilitating the necessary chemical reactions.

3. Platinum, palladium, and rhodium are all precious metals that are very effective catalysts. They are able to facilitate the necessary reactions at the high temperatures found in a car's exhaust system.

4. These metals are used in a finely divided form, which means they are dispersed over a large surface area. This increases their effectiveness, as it allows more of the gas to come into contact with the catalyst.

5. Nickel and iron, while they are also metals that can act as catalysts, are not typically used in catalytic converters. They are not as efficient as the platinum group metals, and they may not be able to withstand the harsh conditions as well.

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