Understanding the spatial distribution of coke deposition within bimodal micro-/mesoporous catalysts using a novel sorption method in combination with pulsed-gradient spin-echo NMR

► Novel method for the determination of the spatial distribution of active metal surface area. ► PGSE NMR studies of mass transport within bimodal Pt-ZSM-5 catalysts. ► Benzene alkylation with ethane studied. ► New method used to explain different coking behaviour in different catalysts.