Reactions between small cerium oxide cluster anions and deuterated water were monitored as a function of both water concentration and temperature in order to determine the temperature dependence of the rate constants. Sequential oxidation reactions of the CexOy (x = 2, 3) suboxide cluster anions were found to exhibit anti-Arrhenius behavior, with activation energies ranging from 0 to -18 kJ mol(-1). Direct oxidation of species up to y = x was observed, after which, -OD abstraction and D2O addition reactions were observed. However, the stoichiometric Ce2O4 and Ce3O6 cluster anions also emerge in reactions between D2O and the respective precursors, Ce2O3D and Ce3O5D2. Ce2O4 and Ce3O6 product intensities diminish relative to deuteroxide complex intensities with increasing temperature. The kinetics of these reactions are compared to the kinetics of the previously studied MoxOy and WxOy reactions with water, and the possible implications for the reaction mechanisms are discussed.