| abstract |
The invention relates to a catalyst for oxidative dehydrogenation of ethane to produce ethylene coupled with elimination of nitrous oxide and its preparation and application. Specifically, a NiX composite metal oxide (NiX-MO) prepared from an ultra-thin NiX hydrotalcite (NiX-HT, X=Al, Ga, In) as a precursor, the active components are NiO, Ni:X The ratio can be adjusted between 2 and 5. The ultra-thin NiX-HT is prepared by co-precipitation combined with a microemulsion method, and the NiX-MO is obtained by calcining the hydrotalcite, and the calcination temperature is 400-700 °C. The catalyst can convert ethane to ethylene with high selectivity at 400-650℃, the volume ratio of C 2 H 6 and N 2 O is 0.5-5, He or N 2 equilibrium, and can eliminate N 2 O, And no carbon deposition, continuous operation for 240h without deactivation. The invention is based on the improved nickel-based catalyst of ultra-thin hydrotalcite, and at a certain conversion rate, the selectivity can reach 100%. The significance of ultra-high ethylene selectivity lies in atom economy, which makes ethane carbon atoms close to 100% utilization, and the products are ethylene and water at the same time, which reduces the cost of product separation and has good industrial application prospects. |