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Effect of Calcination Temperature on the Structure and Catalytic Performance of the Ni/Al2O3 and Ni–Ce/Al2O3 Catalysts in Oxidative Dehydrogenation of Ethane

Author:
Smoláková, Lucie, Kout, Martin, Koudelková, Eva, Čapek, Libor
Source:
Industrial & Engineering Chemistry Research 2015 v.54 no.51 pp. 12730-12740
ISSN:
1520-5045
Subject:
acidity, catalysts, catalytic activity, dehydrogenation, engineering, ethane, ethylene, nickel, surface area, temperature
Abstract:
We studied the effect of calcination temperature of Ni/Al₂O₃ and Ni–Ce/Al₂O₃ catalysts on the specific surface area, acidity, ratio of pore volume and specific surface area, reducibility reflecting the changing population of Ni(Td) and Ni(Oₕ) species, and activity/selectivity in oxidative dehydrogenation of ethane. It should be stressed that the role of Ce as a promoter on the catalytic activity of Ni–Ce/Al₂O₃ catalysts decreased with an increasing value of the calcination temperature. At a reaction temperature of 500 °C, the highest productivity to ethene was observed for the Ni–Ce/Al₂O₃ catalyst calcined at 500 °C. Ni–Ce/Al₂O₃ catalysts calcined at 500–750 °C showed the same selectivity to ethene. The Ni–Ce/Al₂O₃ catalysts calcined at 900 and 1000 °C showed a sharp decrease in the selectivity and the activity, which was probably associated with the formation of NiAl₂O₄ spinel.
Agid:
5383718