中文摘要：

用溶解法制备了添加助剂PtO2和Rh2O3的Co基载氧体，并对其进行化学相组成和结构强度的分析，通过H：程序升温还原实验可以发现，添加助剂后，载氧体的还原反应温度均有一定程度的降低，说明反应能力均有所增加。在热重实验台上，详细研究了载氧体与燃料二甲醚（dimethylether，DME）的还原反应性能，结果表明，添加助剂后载氧体还原反应速率均显著提高，可以计算出（CoO＋1．0％Rh2O3）／CoAl2O4和（CoO＋1．0％PtO2）／CoAl2O4与DME还原反应的平均活化能分别为109和85kJ／mol，均低于CoO／CoAl2O4的活化能，且（CoO＋1．0％PtO2）／CoAl2O4的反应性能要更好一些。另外，研究了助剂含量与反应速率关系，理想的PtO2含量应为1．0％左右。最后，在固定床实验台上对载氧体与DME之间的化学反应动力学实验表明，DME流量和载氧体粒径均对反应速率有较大影响。

英文摘要：

The new Co-based oxygen carrier with PtO2 and Rh203 additives was synthesized by the dissolution method, and the analysis of chemical phase composition and structure strength was carried out. The results of H2 temperature-programmed reduction experiment show that the reduction reaction temperature of oxygen carrier decreases after added PtO2 and Rh203, indicating the improvement of reaction capacity. The reduction reaction experiments of oxygen carriers with dimethyl ether （DME） were conducted on thermogravimetrical analyzer, the results show that the reaction rate of oxygen carriers with additives is higher than oxygen carriers without additives. Besides, the activation energy of （CoO ＋ 1.0%Rh2O3）/CoAl2O4 and （CoO＋1.0%PtO2）/CoAl2O4 is 109 kJ/mol and 85 kJ/mol respectively in the reaction, which is lower than CoO/COAl2O4. It could be seen that the reaction capacity of （CoO＋1.0%PtO2）/CoAl2O4 was better. Also, the experiment study of additives content and reaction rate identify that the satisfied value of the PtO2 content is considered to be around 1.0%. Finally, the reaction kinetics experiments on fixed bed reactor show that the flow rate of DME and particle size of oxygen carrier have an important impact on reaction rate of the reduction reaction between （CoO＋1.0%PtO2）/CoAl2O4 and DME.