Tuning the selectivity of methanol-to-hydrocarbons conversion on H-ZSM-5 by co-processing olefin or aromatic compounds

► Selectivity of MTH can be systematically tuned at isoconversion through the addition of an olefin or aromatic co-feed. ► Propene is formed by both cracking of olefins and from dealkylation of aromatics. ► C8+ aromatics are the predominant products of cyclization of aliphatics.