Oxidative dehydrogenation of ethane over a monolith coated by molybdenum-vanadium-niobium mixed-oxide catalyst

摘要

Oxidative dehydrogenation of ethane to ethylene was investigated using Mo_(0.71)V_(0.21)Nb_(0.08) mixed-oxide catalyst, in powder form and coated over a monolith. At 570 ℃ and with a feed stream containing an O_2/C_2H_6 mole ratio of one, ethylene selectivity value reaching to 96% was obtained at a conversion level of about 5% with the monolith-supported catalyst. DRIFTS studies indicated the presence of adsorbed ethoxide species. The proposed reaction scheme for the production of ethylene includes the elimination of β-hydrogen of adsorbed species by the lattice oxygen.