Abstract
The MgF2–MgO system with different compositions is tested as a potential support of nickel oxide catalysts in the NO+C3H6+O2 reaction as a function of the MgF2/MgO ratio in the support and the reaction conditions. The study was performed at temperatures ranging from 250 to 475°C in the reducing, oxidizing and stoichiometric conditions. The activity of NiO/MgF2–MgO catalysts was compared to those of NiO/MgF2, NiO/MgO, NiO/Al2O3 and NiO/SiO2. The highest activities were obtained for the catalysts supported on pure MgF2, especially in the reducing conditions. Mixed system MgF2–MgO gave a support on which nickel revealed much higher activities in NO reduction both in reducing and in oxidizing conditions when compared to NiO/MgO catalyst.
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