Oxidative dehydrogenation of ethane: A study over the structure and robustness of Ni-W-O catalysts

[EN] The robustness of one selected Ni-W-O catalyst has been studied in the oxidative dehydrogenation of ethane. This catalyst initially deactivates for the first 10 h online decreasing 15% of its catalytic activity compared to its initial stable catalytic activity. However from 10 to 60 h online the catalytic activity keeps almost stable. On the other hand, it has been shown that the Ni-W-O catalyst cannot tolerate an oxygen-free atmosphere (C-2 and He) as nickel oxide is transformed into metallic nickel. Methane and hydrogen as well as abundant coke were formed on the surface of the catalyst in these O-free conditions. However a re-calcination in air leads to the removal of coke, the catalytic performance in the oxidative dehydrogenation of ethane being almost completely restored.Financial support from DGICYT in Spain (Projects CTQ2012-37925-C03-01 and CTQ2012-37925-C03-03) is gratefully acknowledged. The authors also want to thank the SCSIE, University of Valencia, for providing HRTEM facilities.Agouram, S.; Dejoz, A.; Ivars Barceló, F.; Vazquez, I.; López Nieto, JM.; Solsona, B. (2014). Oxidative dehydrogenation of ethane: A study over the structure and robustness of Ni-W-O catalysts. Fuel Processing Technology. 119:105-113. doi:10.1016/j.fuproc.2013.10.017S10511311