A series of Mn₅Co₁O_x catalysts calcined at different temperatures in the range of 400–800 °C were synthesized by coprecipitation of manganese and cobalt nitrates and tested in the oxidation of CO. The specific surface area, structure, and chemistry of the catalysts were studied. In addition, the reduction of the catalysts by hydrogen was studied using in situ X-ray diffraction and temperature-programmed reduction techniques. It was found that the low-temperature catalyst calcined at 400 °C displays the best catalytic activity, which is attributed to its high surface area, low-temperature reducibility, and a high surface content of Mn⁴⁺. The formation of highly disperse and active CoMnO₃ species and excess oxygen in a Mn_3−xCo_xO_4+δ spinel leads to excellent low-temperature redox properties. The elevated temperature calcination results in a decline in the catalytic activity in CO oxidation due to formation of a well crystalline Mn_3−xCo_xO₄ spinel, a decrease in the surface area and reducibility.

通过锰和硝酸钴的共沉淀合成了一系列在不同温度下（400-800°C）煅烧的Mn ₅ Co ₁ O _x催化剂，并在CO的氧化中进行了测试。比表面积，结构和化学性质研究了催化剂。另外，使用原位X射线衍射和程序升温还原技术研究了通过氢气还原催化剂。发现在400℃下煅烧的低温催化剂表现出最佳的催化活性，这归因于其高的表面积，低温的还原性和Mn ⁴⁺的高的表面含量。高分散活性CoMnO ₃的形成Mn _3-x Co _x O _{4 +δ}尖晶石中的杂质和过量的氧导致优异的低温氧化还原性能。高温煅烧导致结晶良好的Mn _3-x Co _x O ₄尖晶石的形成，CO氧化催化活性的下降，表面积和还原性的降低。