Descirbe some features of catalysis by zeolites.

Explanation

To describe some features of catalysis by zeolites, we can break down the information into several key points:

### Step-by-Step Solution:

1. **Definition of Zeolites**:
- Zeolites are hydrated aluminosilicates, which means they are minerals composed of aluminum, silicon, and oxygen, along with water molecules. They have a unique three-dimensional network structure that allows for the presence of water within their framework.

2. **Activation of Zeolites**:
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