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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H2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(dimethyl ether,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。
The Co-based oxygen carriers with additive additives PtO2 and Rh2O3 were prepared by the dissolution method, and the chemical phase composition and structural strength were analyzed. The temperature-programmed reduction experiment with H2 showed that after the addition of additives, the reduction of oxygen carrier The reaction temperature is reduced to a certain extent, indicating that the reaction ability has increased. On the thermogravimetry platform, the reduction reaction of oxygen carrier and dimethyl ether (DME) was studied in detail. The results showed that the reduction rate of oxygen carrier after the addition of additives was significantly increased, and the CoO + 1.0% Rh2O3) / CoAl2O4 and (CoO + 1.0% PtO2) / CoAl2O4 with DME were 109 and 85 kJ / mol, respectively, which were lower than that of CoO / PtO2) / CoAl2O4 reaction performance should be better. In addition, the relationship between the content of auxiliaries and the reaction rate was studied. The ideal PtO2 content should be about 1.0%. Finally, kinetics of chemical reaction between oxygen carrier and DME on a fixed bed test bench shows that both the flow rate of DME and the particle size of the oxygen carrier greatly affect the reaction rate.