Tables and show the phase composition of both materials after the temperature programmed reaction experiments described above. As displayed in figure , in the smaller crystallite size sample, those signals, which are part of the diffractograms of both NiFe2O4 and NiO, are stronger than they should in pure NiFe2O4 and due to the width of the signals it is impossible to reliably perform modelling of phase composition. After the oxidative dehydrogenation experiments, which include two cycles, 19 % NiO are found at an 2-propanol:O2 ratio of 2:1, whereas only an negligible amount of NiO, but 8 % of metallic Ni and < 2 % of carbon were found at a 2-propanol:O2 ratio of 1:1. It is assumed, that the atmosphere at an 2-propanol:O2 ratio of 2:1 is sufficiently reducing to reduce Ni 2+ in the spinel lattice to form metallic Ni, which is then re-oxidised to NiO. At a 2-propanol:O2 ratio of 1:1, the evolution of the reducing agents CO and H2 by partial oxidation of 2-propanol (and possibly acetone in a consecutive reaction)