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Layered double hydroxides (LDHs) containing\udMg^{2+}, Cu^{2+} or Zn^{2+} cations in the Me^{II} positions and Al^{3+}\udand Fe^{3+} in the Me^{III} positions were synthesized by co-\udprecipitation method. Detailed studies of thermal trans-\udformation of obtained LDHs into metal oxide systems were\udperformed using high temperature X-ray diffraction in\udoxidising and reducing atmosphere, thermogravimetry\udcoupled with mass spectrometry and temperature-pro-\udgrammed reduction. The LDH samples calcined at 600 and\ud900 °C were tested in the role of catalysts for selective\udoxidation of ammonia into nitrogen and water vapour. It\udwas shown that all copper congaing samples presented high\udcatalytic activity and additionally, for the Cu–Mg–Al and\udCu–Mg–Fe hydrotalcite samples calcined at 600 °C rela-\udtively high stability and selectivity to dinitrogen was\udobtained. An increase in calcination temperature to 900 °C\udresulted in a decrease of their catalytic activity, possibly\uddue to formation of well-crystallised metal oxide phase which are less catalytically active in the process of selective oxidation of ammonia

journal of thermal analysis and calorimetry

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen