What is the role of desorption in the process of catalysis?

Explanation

### Step-by-Step Text Solution:

1. **Understanding Adsorption and Desorption**:
- In catalysis, reactant molecules (adsorbates) adhere to the surface of a catalyst. This process is known as adsorption. However, for the catalyst to facilitate further reactions, it is essential that there is space available on its surface.

2. **Role of Desorption**:
- Desorption is the process where adsorbed molecules leave the surface of the catalyst. This is crucial because if the surface is fully occupied by adsorbates, new reactant molecules cannot attach to the catalyst.

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