Catalytic dehydrogenation of isobutane in the presence of carbon dioxide over nickel supported on active carbon

The dehydrogenation of isobutane to isobutene was carried out in the presence of carbon dioxide over the catalyst nickel supported on active carbon (AC). The state and property of nickel species (NiOx) in the catalyst are relevant to its calcination temperature, because NiO may be partially reduced to Ni by AC at high temperature. NiO and Ni species are different in the catalytic behaviors; Ni is only effective for direct dehydrogenation of isobutane, while NiO is also highly active for the coupled dehydrogenation with carbon dioxide. Carbon dioxide can significantly enhance the dehydrogenation of isobutane over NiO/AC through keeping NiO species, in situ eliminating hydrogen produced and suppressing coke formation.

Dehydrogenation of isobutane to isobutene was carried out in CO2 over NiO/AC. NiO and Ni species present in the catalyst are relevant to its calcination temperature. NiO and Ni species are different in the catalytic behaviors; Ni is only effective for direct dehydrogenation, while NiO is also highly active for the coupled dehydrogenation with CO2.Figure optionsDownload as PowerPoint slide