Abstract

Oxidative dehydrogenation of ethane to ethylene was investigated over Chromia and Cr-V mixed oxide catalysts synthesized following a complexation procedure. With an O₂/C₂H₆ feed ratio of 0.17, Chromia exhibited a total conversion value of about 0.20 at 447°C (at a space time of 0.24 s.g/mL) with an ethylene selectivity of 0.82. Chromia catalyst was more active than Cr-V mixed oxide at temperatures as low as 200°C. Pulse-response experiments carried out with ethane pulses injected into O₂-He indicated the presence of at least two different sites for the formation of CO₂ and H₂O over Chromia catalyst. In the dynamic experiments carried out with the Cr-V mixed oxide catalyst and by injecting O₂ pulses into a gas stream containing a mixture of C₂H₆ and He, formation of CO rather than C₂H₄ was favored. Results of the dynamic runs carried out without gas phase oxygen strengthened the conclusion of lattice oxygen participation in the selective oxidation of ethane reaction through a redox mechanism.

Recommended Citation

Karamullaoglu, Gulsun and Dogu, Timur (2007) "Dynamic and Steady State Analysis of Low Temperature Ethane Oxidative Dehydrogenation over Chromia and Chromia-Vanadia Catalysts," International Journal of Chemical Reactor Engineering: Vol. 5: A83.
Available at: http://www.bepress.com/ijcre/vol5/A83