The importance of realumination in catalysis lies in its ability to restore the acidity and structural integrity of zeolites. Zeolites are widely used in catalytic processes such as Fluid Catalytic Cracking (FCC), Hydrocracking, and Methanol to Hydrocarbons (MTH). Over time, these materials can lose aluminum atoms from their framework due to dealumination, resulting in a loss of catalytic activity. Realumination helps to reintroduce aluminum species into the framework, thus restoring the material's catalytic efficiency.