Characterization of Ga/ZSM-5 for the catalytic aromatization of dilute ethylene streams
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Ga/ZSM-5 is an effective catalyst for the conversion of dilute (3%) ethylene-in-methane reactant streams into aromatic hydrocarbons at 500-550C. A Ga loading as low as 0.5 wt% is sufficient to obtain maximum yields of aromatic products. At 520C, an ethylene conversion of 93%, with an aromatics selectivity of 81%, was obtained over a 5 wt% Ga/ZSM-5 catalyst. The conversion of ethylene into aromatics over Ga/ZSM-5 catalysts involves a complex sequence of oligomerization, isomerization, cracking, and cyclization reactions that occur on Brnsted acid zeolites in the zeolite. The role of the gallium, which exists as both Ga3+ at zeolitic exchange sites and as Ga2O3 within the channels and on the external surface of the calcined catalyst, is to promote dehydrogenation of the acid-catalyzed oligomerization and cyclization products.
author list (cited authors)
Qiu, P., Lunsford, J. H., & Rosynek, M. P.
complete list of authors
Qiu, P||Lunsford, JH||Rosynek, MP