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We investigate the influence of zeolite pore size and shape selectivity on the conversion of glucose to aromatics. Zeolites having a variety of pore size and shape (small pore ZK-5, SAPO-34, medium pore Ferrierite, ZSM-23, MCM-22, SSZ-20, ZSM-11, ZSM-5, IM-5, TNU-9, and large pore SSZ-55, Beta zeolite, Y zeolite) were synthesized, characterized, and tested in a pyroprobe reactor coupled with GC–MS for the conversion of glucose to aromatics. The aromatic yield was a function of the pore size of the zeolite catalyst. Small pore zeolites did not produce any aromatics with oxygenated products (from pyrolysis of glucose), CO, CO₂ and coke as the major products. Aromatic yields were highest in the medium pore zeolites with pore sizes in the range of 5.2–5.9Å. High coke yield, low aromatic yields, and low oxygenate yields were observed with large pore zeolites, suggesting that the large pores facilitate the …