Abstract
The usefulness of high energy ion beam analysis techniques, such as Rutherford Backscattering Spectrometry (RBS), Elastic Recoil Detection (ERD), and High Energy Ion Channeling (HEIS-c), in investigations of deactivation processes in (model) catalysts is demonstrated. These techniques have been applied to study interfacial MeAl 2 O 4 formation and the influence of water vapour on MeO/Al 2 O 3 model catalysts (Me = Ni, Co, Cu, Fe), and to follow sintering of Ni on α-Al 2 O 3 . We observed a much higher reaction rate of spinel formation with γ-Al 2 O 3 than with α-Al 2 O 3 substrates. This rate was larger for cobalt and copper oxides layers than for nickel or iron oxides. Furthermore, it appeared that (in increasing rate order) cobalt, nickel and copper oxides disappear into the vapour phase, presumably as hydroxides, at 1000 °C in the presence of 0.3 atm steam.
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