What is shape `-` selective catalysis ?

Explanation

### Step-by-Step Solution:

1. **Definition of Shape-Selective Catalysis**:
- Shape-selective catalysis refers to a catalytic process that is influenced by the shape of the catalyst's pores and the size of the reactant and product molecules.

2. **Key Factors**:
- The effectiveness of shape-selective catalysis depends on two main factors:
- **Structure of the Catalyst's Pores**: The arrangement and size of the pores in the catalyst determine which molecules can enter and react.
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