H2 is considered a clean and versatile fuel that can be produced via chemical looping by water splitting (cyclic water gas shift). Typically, the process comprises of reduction (MeO + CO = Me + CO2) and H2 production (Me + H2O = MeO + H2). Previous studies focussed on performing the combustion at sufficiently high temperatures, e.g. > 800°C, avoiding the carbonation of CaO; here, the investigation was extended to lower temperatures (500 – 900°C). In this work, we attempted to improve Calcium Ferrite (C2F) kinetics towards CO by impregnating it with more active metals such as CuO, NiO, and CeO2. Their performances are investigated using a fluidised bed and thermogravimetric analyser in which the different kinetic interpretations between them are contrasted. C2F + CO = CaO + Fe + CO2 has PCO/PCO2 of ~3, however at temperatures when carbonates can form, C2F follows a direct reductive-carbonation, allowing C2F to react at lower PCO/PCO2, adding the reaction. Adding CuO to C2F improved not only the kinetics of C2F towards CO but also its cyclic stability, whereas other dopants worsened the cyclic stability of the C2F.