What is the role of adsorption in heterogeneous catalysis?

Explanation

**Step-by-Step Solution:**

1. **Definition of Adsorption**:
- Adsorption is defined as the accumulation of molecules from a gas, liquid, or dissolved solid on the surface of a solid or liquid. In this process, the adsorbate (the substance being adsorbed) adheres to the surface of the adsorbent (the solid surface).

2. **Understanding Heterogeneous Catalysis**:
- Heterogeneous catalysis occurs when the reactants and the catalyst are in different phases. Typically, in this type of catalysis, the reactants are in the gaseous state while the catalyst is in the solid state.

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