Nickel supported on zirconium doped mesoporous silica as catalysts for the gas phase hydrogenation of acetonitrile.

摘要

Gas-phase hydrogenation of acetonitrile has been studied by using catalysts based onnickel supported on zirconium doped mesoporous silica, with different nickel loading. Thecatalysts have been characterised using XRD, H2-TPR, N2 adsorption and NH3-TPD. Thecatalytic activity, at 135℃, is higher for the catalyst with the lowest Ni content, but theturnover frequency values follow the inverse order. In the steady state, the turnover frequencynumbers are in all cases higher than 0.15 mmol gNi~(-1) s~(-1), whereas the selectivity is highertoward ethylamine (43-57 mol%). The catalysts deactivate after a time-on-stream whichdepends on the nickel loading. However, an almost complete regeneration of catalysts isaccomplished after treatment with H2 at 400℃ for 1 h.