ABSTRACT
Introduction Catalytic reactions are carried out in reactors with a xed, uidized, or moving bed of the catalyst. While the chemical kinetics of the reaction obviously remains the same for all these reactors, the hydrodynamic features vary considerably. Since no complete description of these features is possible, it is convenient to postulate different situations and develop mathematical models to represent these situations for each type of reactor. It is also important to note that wherever solid catalysts are used, the question of catalyst deactivation cannot be ignored. Several books and reviews covering a variety of situations have been collected in the Bibliography for further reference.
