Investigation of coke deposition inside catalyst with heterogeneous active component distribution

Coke deposition over catalytic particles is not only associated with pore structure and pore distribution, but also depends on the active component distribution. A particle-resolved model is employed to explore the coke deposition process inside catalyst particles with heterogeneous active component distribution. The spatial and instantaneous distribution of coke deposition and its influence on catalytic performance in a single particle and a packed bed are evaluated. The results show that there is a weaker internal resistance of mass and heat transfer inside the egg-shell type catalyst so as to lead to a faster coke accumulation and catalyst deactivation, compared to the egg-yolk type catalyst. Meanwhile, the wall effect on coke accumulation is more significant for egg-yolk type catalysts.