Abstract: Cu/Mn composite oxygen carriers were prepared using ZrO₂ as binder and the influences of gas flow rate， temperature， inlet oxygen concentration， particle diameter on the oxidation and reduction reactivity of Cu/Mn composite oxygen carriers were examined in a fixed-bed reactor. The results showed that the reduction and oxidation rates increase with the increase of gas flow rate. High temperature favors the reduction， but restricts the oxidation of the Cu/Mn composite oxygen carriers. In the reduction stage， lower oxygen concentration leads to higher reduction rate. However， in the oxidation stage， oxidation rate increases with the increasing of oxygen concentration. For the composite oxygen carriers with different particle diameters， big particle diameter favors both the reduction and oxidation rates.

Key words: chemical looping technology, Cu/Mn composite oxygen carriers, fixed bed, reduction rate, oxidation rate