Catalytic behavior in propane aromatization using GA-MFI catalyst

doi:10.1016/j.cjche.2017.04.016

Abstract

Abstract: Ga-Al-MFI samples were synthesized in hydrothermal conditions from gels of composition 1.08CH₃NH₂- 0.134TPABr-1SiO₂-xAl₂O₃-yGa₂O₃-40H₂O at 175 ℃ for 7 days, with x = 0.005 and 0.0025, y = 0.005, 0.010 and 0.020. The samples were characterized by XRD, BET measurements, thermal analysis (TGA-DTA) atomic absorption and high resolution solid state MAS ²⁷Al and ⁷¹Ga NMRmeasurements. The aromatization of propane was studied as catalytic test. The activity and selectivity of the catalysts were determined for benzene, toluene and xylenes on the one hand and for methane and ethane on the other hand. The most active sample was obtained with the highest Ga/Al ratio. For this sample, the BTX selectivity obtained by aromatizationwas always higher than the hydrocracking selectivity leading tomethane and ethane. The relative amount of toluenewas higher than that of benzene and of xylenes. The samples were deactivated by coke formation thatwas revealedmore severe for the most active sample.

Key words: Propane aromatization, Gallium, ZSM-5, Coke formation, Catalyst deactivation

摘要： Ga-Al-MFI samples were synthesized in hydrothermal conditions from gels of composition 1.08CH₃NH₂- 0.134TPABr-1SiO₂-xAl₂O₃-yGa₂O₃-40H₂O at 175 ℃ for 7 days, with x = 0.005 and 0.0025, y = 0.005, 0.010 and 0.020. The samples were characterized by XRD, BET measurements, thermal analysis (TGA-DTA) atomic absorption and high resolution solid state MAS ²⁷Al and ⁷¹Ga NMRmeasurements. The aromatization of propane was studied as catalytic test. The activity and selectivity of the catalysts were determined for benzene, toluene and xylenes on the one hand and for methane and ethane on the other hand. The most active sample was obtained with the highest Ga/Al ratio. For this sample, the BTX selectivity obtained by aromatizationwas always higher than the hydrocracking selectivity leading tomethane and ethane. The relative amount of toluenewas higher than that of benzene and of xylenes. The samples were deactivated by coke formation thatwas revealedmore severe for the most active sample.

关键词: Propane aromatization, Gallium, ZSM-5, Coke formation, Catalyst deactivation

Alfredo Aloise, Enrico Catizzone, Massimo Migliori, Jànos B. Nagy, Girolamo Giordano. Catalytic behavior in propane aromatization using GA-MFI catalyst[J]. Chin.J.Chem.Eng., 2017, 25(12): 1863-1870.

Alfredo Aloise, Enrico Catizzone, Massimo Migliori, Jànos B. Nagy, Girolamo Giordano. Catalytic behavior in propane aromatization using GA-MFI catalyst[J]. Chinese Journal of Chemical Engineering, 2017, 25(12): 1863-1870.

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