4.2 Catalysis:Catalysis, Promoters and Poisons- Auto Catalysis- Homogeneous and Heterogeneous Catalysis- Adsorption Theory of Heterogeneous Catalysis- Important Features of Solid Catalysts: (a) Activity, (b) Selectivity- Shape- Selective Catalysis by Zeolites- Enzyme Catalysis- Characteristics and Mechanism- Catalysts in Industry