Define shape selective catalysis. Give an example of a shape selective catalyst.

Explanation

**Step-by-Step Solution:**

1. **Definition of Shape Selective Catalysis:**
Shape selective catalysis refers to a process in which a catalyst selectively absorbs reactant molecules based on their size and shape. This means that only certain molecules can enter the active sites of the catalyst, while others are excluded. This selectivity can enhance the efficiency of the catalytic process and can lead to the production of specific products.

2. **Characteristics of Shape Selective Catalysis:**
- The catalyst has pores or channels of specific dimensions that allow only certain reactants to pass through.
- It can lead to higher selectivity for desired products and minimize side reactions.
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