Abstract
GaOx catalysts supported on Na-form ZSM-5 with different crystallite sizes were studied in the ethane dehydrogenation reaction in the presence of CO2. Submicron zeolite ZSM-5-S supported catalyst showed the best activity among these catalysts, with an ethane conversion of 25% and ethylene selectivity of 92%. Py-IR tests revealed that Ga/ZSM-5-S contained abundant Lewis acids and Brönsted ones, which can have a synergistic effect in the dehydrogenation. Silanols on the surface play an important role in dispersing the active GaOx species. Silanol nests can not only be helpful in dispersing active species but also act as Brönsted acid sites which facilitate the conjugated effect of Brönsted acidic sites and Ga species, thus promoting the dehydrogenation reaction.
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