This section of the chapter "Fundamentals of Adsorption" covers several key aspects of catalyst characterization and their surfaces. It emphasizes the significance of pore structure and surface area in heterogeneous catalysis, discusses the phenomena of poisoning, promotion, deactivation, and selectivity of catalysts, and provides an overview of catalytic process engineering.This section of the chapter "Fundamentals of Adsorption" covers several key aspects of catalyst characterization and their surfaces. It emphasizes the significance of pore structure and surface area in heterogeneous catalysis, discusses the phenomena of poisoning, promotion, deactivation, and selectivity of catalysts, and provides an overview of catalytic process engineering.