Characterisation of carbonaceous residues on the pentasil zeolite ZSM-5 following reactivation: a solid state 13C n.m.r. spectroscopic study
Abstract
High resolution 13C n.m.r. characterisation of carbonaceous residues present in the zeolite ZSM-5 following oxygen and ozone/oxygen reactivation has identified distinct species of which only the highly aromatic type can be linked to catalyst deactivation.