Understanding the dynamic nature of catalysts during reactions is essential for several reasons: 1. Identification of Active Sites: Determining the specific sites on a catalyst where the reaction occurs. 2. Structural Changes: Observing any structural modifications that the catalyst undergoes during the reaction. 3. Reaction Mechanisms: Gaining insights into the pathways and intermediates involved in the catalytic process. 4. Optimization: Enhancing catalyst performance by tailoring its properties based on real-time data.