Modeling of Fischer-Tropsch catalyst pellet on basis of detailed mechanism kinetics II. Diffusion-reaction behavior and non-uniform activity distribution

According to the pellet models constructed in the first part of this paper, the diffusion-reaction performance in a spherical catalyst pellet, and the effects of operation conditions and pellet size on reactivity and product selectivity were systematically investigated. Being combined with the requirement of large pellets in industrial fixed bed, the possibility and rationality of using eggshell-type catalysts in Fischer-Tropsch synthesis are analyzed numerically with consideration of non-uniform distribution of catalyst activity.