Simplified models are employed for several reasons: 1. Computational Efficiency: Full-scale simulations of catalytic processes can be computationally expensive. Simplified models reduce the computational load while providing valuable insights. 2. Conceptual Clarity: By focusing on key elements, simplified models help elucidate the underlying mechanisms of catalytic reactions. 3. Predictive Power: Even with reduced complexity, these models can often predict trends and behaviors that are experimentally verifiable.