EFFECT ON SELECTIVITY OF THE MACROSCOPIC DISTRIBUTION OF THE COMPONENTS IN A DUAL FUNCTION CATALYST

This paper is concerned with the effect on selectivity of the macroscopic distribution of the components X and Y of a dual function catalyst. Three catalyst formulations are considered: (1) catalyst I where catalyst X 1: distributed at the pore mouth, (2) catalyst II where catalyst Y is distributed at the pore mouth, and (3) nonporous catalyst III where catalysts X and Y are mixed together. The selectivities of each catalyst are compared for the consecutive reaction scheme AX→kBY→k CX→kD and factors influencing the optimum catalyst composition are discussed. The results show that under certain circumstances the macroscopic distribution of catalyst functions greatly affects the yields of intermediate products and suggest that the macroscopic distribution of functions can be an important variable in catalyst design. © 1979.