Catalysts are substances that are used to speed up chemical reactions by lowering the activation energy required for the reaction to occur. These substances are essential in many industrial processes, including the production of chemicals, fuels, and pharmaceuticals. However, catalysts can be expensive and may become deactivated or contaminated over time, leading to reduced efficiency and increased costs. Catalyst recovery is the process of recovering and recycling catalysts to reduce costs and environmental impact. In many cases, catalysts can be regenerated or reactivated, allowing them to be reused in subsequent reactions. Catalyst recovery can be achieved through various methods, including physical, chemical, and biological processes.