The assumptions suitable to the experimental conditions are evaluated in detail in our previous work by Meyer at al. . Briefly, absence of gradients and differential operation can be assumed, since the carbon oxide conversion is below 20 % in all experiments . Furthermore, limitations by equilibrium can be excluded according to Gao et al. and own calculations . We also excluded external diffusion limitations (via the Carberry criterion ) and effects of axial dispersion, while isothermal conditions are proven by measuring the temperature profile under reaction conditions. Absence of blind activity was confirmed by experiments with 800 µm Al2O3 particles at 573 °C. The evaluation of the measurement results is carried out using the methodology reported in our previous work .