Mechanical degradation typically occurs through several mechanisms:
1. Attrition: Continuous rubbing or grinding can cause catalyst particles to break apart. 2. Erosion: High-speed gas or liquid flows can wear down the catalyst's surface. 3. Crushing: High-pressure environments can lead to the physical crushing of catalyst particles. 4. Thermal Cycling: Repeated heating and cooling can cause expansion and contraction, leading to cracks and fractures in the catalyst structure.
