Give an example of 'shape-selective catalyst'.

Explanation

### Step-by-Step Solution:

1. **Understanding Shape-Selective Catalysis**:
- Shape-selective catalysis refers to a catalytic process where the activity of the catalyst depends on the size and shape of the reactant molecules. This means that only certain molecules can enter the pores of the catalyst and react, while others cannot.

2. **Factors Influencing Shape-Selective Catalysis**:
- There are three main factors that influence shape-selective catalysis:
- **Pore Structure of the Catalyst**: The arrangement and size of the pores in the catalyst material determine which reactants can access the active sites.
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