For high value added products of aromatics such as benzene, toluene and xylenes (BTX) from lower alkane seems to be quite interesting due to value addition from the shale gas and natural gas of abundant sources and petrochemical byproducts. The aromatization from lower alkanes such as LPG was developed by the UOP&BP as the Cyclar process by using the Ga/ZSM-5 as a catalyst. Even the propane to aromatic yields were 66 wt.%, the coke formation on catalyst appeared as serious problem. The ZSM-5 zeolite, has been widely used as catalysts for industrial applications such as cracking, isomerization, alkylation gas line products aromatization as acid catalysts as well as bi-functional catalysts by accommodated metals via impregnation, framework or ion-exchange. The metal species are used for the aromatization was known to play as a Lewis acid site which possesses the ability of C-H bond activities of alkanes to give the dehydrogenation and cyclization activities with the Bronsted acidity of the H-ZSM-5 properties. The aromatization mechanism was consisted of dehydrogenation, oligomerization, cyclization and aromatization. Among the process, the dehydrogenation step of propane is rate determining step. Applying the CO2 on aromatization is aimed in this study in order to couple the RWGS before CO2 and H2 formed as H2O reaction. In our previous studies, the CO2 was validated to play as both promoter and soft oxidant. The CO2 molecules are expected to be controlled it. We defined it as CO2 enhancer. The study for the roll of CO2 on surface during the aromatization is important for understanding the concept of CO2 utilization.

Oxidative aromatization of propane with CO2 over bi-functional MFI zeolite catalyst

251st National Meeting (2016)

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