Abstract The article contains sections titled: Introduction Kinds of Catalysis Homogeneous Catalysis Enzyme Catalysis Heterogeneous Catalysis History Adsorption of Gases On Solid Surfaces Types of Adsorption Adsorption Isotherms Dissociative Adsorption Thermal Desorption Types of Catalytic Materials Supported and High‐Area Catalysts Supported Metal Catalysts Supported Nonmetal Catalysts Amorphous Oxide Catalysts Zeolites Unsupported Catalysts Single‐Crystal Catalysts Preparation and Characterization of Heterogeneous Catalysts Preparation Incorporation of the Active Components on the Support Drying and Calcination Thermal Activation Characterization Kinetics of Heterogeneous Catalytic Reactions Elementary Steps Unimolecular Reactions on Surfaces Mechanisms of Heterogeneous Catalysis Chemical Enhancement/ Poisoning of Catalytic Activity Catalyst Promoters Catalyst Poisons Heterogeneous Catalytic Reactors Industrial Catalytic Processes Pollution Control Selective Oxidation Cracking Reforming Summary