Abstract
A novel in situ rejuvenating approach by toluene was proposed to partially restore catalytic activity of deactivated ZSM-5 zeolite in MTP reaction. The acidity, porosity, chemical state of aluminum, coke deposits and organics trapped within ZSM-5 zeolites were investigated to explore the mechanism of rejuvenation. The soluble cokes trapped in ZSM-5 zeolites were characterized by TGA and GC–MS. As hydrocarbon pool species with higher activity, the newly formed bulky polyalkybenzene species during rejuvenation generated via transalkylation between toluene and retained carbonaceous species restored the catalytic activity. Mesoporous ZSM-5 showed more effective rejuvenation to enhanced lifespan by 50%.
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