Catalytic converters use expensive metals as catalysts.
Name the metals generally used.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Catalysts**: A catalyst is a substance that increases the rate of a chemical reaction without undergoing any permanent change itself. This means that it helps the reaction occur more quickly by providing an alternative pathway with a lower activation energy.

2. **Function of Metal Catalysts**: In the context of catalytic converters, metal catalysts work by increasing the frequency of collisions between reactant molecules, which leads to a faster reaction rate. They do not alter the chemical or physical properties of the reactants or products.

3. **Identifying the Metals Used**: The question specifically asks for the expensive metals that are generally used as catalysts in catalytic converters. The most commonly used metals include:
- **Platinum (Pt)**
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