Enzymes are homogeneous catalysts that are essential for life but are also harnessed for industrial processes A wellstudied example is carbonic anhydrase, which catalyzes the release of CO 2 into the lungs from the bloodstream Enzymes possess properties of both homogeneous and heterogeneous catalysts As such, they are usually regarded as a third,Enzymes are homogeneous catalysts that are essential for life but are also harnessed for industrial processes A wellstudied example is carbonic anhydrase, which catalyzes the release of CO 2 into the lungs from the bloodstream Enzymes possess properties of both homogeneous and heterogeneous catalysts As such, they are usually regarded as a third, separate category of (a) Homogeneous Catalysis When the catalyst is present in the same phase as the reactants, the phenomenon is called homogeneous catalysis For example (i) Nitric oxide catalyses the oxidation of sulphur dioxide to sulphur trioxide in the lead chamber process (ii) Hydrogen ions cata