The deactivation models are embedded into a dynamic continuously stirred tank reactor (CSTR) model (see Eq. ( )), which reflects the conditions typically applied for PTK experiments. In PTK the inlet composition is periodically switched with a period duration, 𝜏 , between the half-periods containing either component A or B. The step-wise switching is modelled by a sinus function as basis (Eq. ( )), which is discretised by the modified Heaviside function Φ (Eq. ( )).