Abstract
Non-oxidative conversion of ethane to hydrogen and ethylene was carried out with Cr and Co-based KIT-6 supported catalysts in a conventional heated reactor (C-HRS) and microwave heated reactor (M-HRS) systems. The catalysts were synthesized by wet impregnation of hydrothermally prepared KIT-6 support. X-ray diffraction (XRD) and N2 adsorption–desorption studies showed that the well-ordered three-dimensional mesoporous structure of the KIT-6 support was preserved after 10wt% metal loading. The pyridine adsorbed diffuse reflectance FT-IR (DRIFT) spectroscopy results revealed the presence of Lewis acid sites on the catalysts. The incorporation of Co into the structure slightly increased the Lewis acid sites. The Cr@KIT-6 catalyst exhibited the highest ethylene and hydrogen selectivity with a C2H4/H2 ratio of 1.00 at 650 °C in C-HRS. To compare the effect of active metal on the catalytic activity, Co@KIT-6 catalyst was tested at 650 °C in C-HRS. Although, the ethane conversion values of Cr and Co-based catalysts were similar, Co@KIT-6 catalyst exhibited lower C2H4/H2 ratio (0.51). The characterization studies of the spent catalysts confirmed higher amount of coke deposited on the Co@KIT-6 catalyst. The effect of microwave-assisted heating on the catalytic activity was investigated with Cr and Co-based catalysts at 450 °C in M-HRS. It was determined that much higher ethane conversion and yield values were obtained even at lower temperatures in M-HRS compared to the C-HRS. While the H2 yield was 0.15 at 650 °C in C-HRS, this value increased to 0.37 at 450 °C in M-HRS.
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Acknowledgements
This work was financially supported by Gazi University Research Fund (Grant No. 06/2019-02). The author would like to thanks to Prof. Dr. Kirali Murtezaoglu and Prof. Dr. Nuray Oktar of Gazi University for their suggestions. The author also thanks to the Central Laboratory of METU for the characterization results of the synthesized materials.
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Eslek Koyuncu, D.D. Investigation of the effect of microwave heated reactor on ethane dehydrogenation over KIT-6 supported catalysts. Reac Kinet Mech Cat 132, 379–399 (2021). https://doi.org/10.1007/s11144-021-01928-7
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DOI: https://doi.org/10.1007/s11144-021-01928-7