化学链制氧技术铜基氧载体的性能研究  

Properties of Cu-based Oxygen Carrier Used for Chemical Looping Oxygen Production

作　　者：王坤[1] 于庆波[1] 谢华清[1] 秦勤[1] 李玖重[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《无机材料学报》2013年第10期1115-1120,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51274066)~~

摘　　要：在STA409PC热重分析仪上对Cu/Si氧载体的脱氧-吸氧性能加以研究,并利用BET、SEM和XRD对所制备氧载体的比表面积、表面形貌和物相组成进行分析。结果表明,在N2氛围中,当温度高于850℃时Cu/Si氧载体脱氧反应进入快速反应阶段;氧载体在空气氛围中再生的快速反应温度高于400℃;氧载体脱氧和吸氧的反应速率随颗粒直径的减小及气体流量的增大,而增大但变化不明显,而随反应温度的升高,氧载体脱氧和吸氧反应速率都会急剧增大;23次循环实验中,氧载体脱氧-吸氧性能稳定,经循环之后的氧载体,颗粒表面变得光滑,空隙率增加,但机械强度降低。物相分析结果表明氧载体脱氧后的成分主要有Cu2O和SiO2,吸氧后的成分主要有CuO和SiO2,氧载体的制备方法和循环性能有很好的稳定性和适应性。The optimal reaction temperatures were investigated via the temperature programmed thermogravimetry, and the effects of particle size, gas flow rate and reaction temperature on reduction and oxidation reactions were studied via isothermal thermogravimetry by using STA409PC thermal analyzer. BET, SEM and XRD were also used to analyze the specific surface area, surface morphology and phases of the prepared oxygen carriers. The results show that the Cu/Si oxygen carrier has the high reactivity of releasing and adsorbing oxygen when the temperatures are higher than 850 ℃ and 400 ℃. The reaction rates have increased with gas flow rate increase and particle size decreasing, but the increase tendency is not apparent. The reaction rates increase greatly with the temperature increase. The oxygen carrier has excel- lent stability under 900 ℃ oxygen reduction and 700 ℃ oxygen oxidation conditions. Phases and surface morphology of oxygen carriers were measured by X-ray diffraction and scanning electron microscope before and after experiments. The main phases of oxygen carrier are composed of CuO and SiO2 in fresh and oxidized samples, Cu2O and SiO2 in reduced samples, which reveal that the oxygen carrier is stable when using the preparation process and under the operation condi- tions. The porous structure of cycled oxygen carrier is much more apparent than fresh samples and particles do not appear to disintegrate after 23 cycles.

关 键 词：化学链制氧 氧载体 脱氧反应 吸氧反应 性能研究 

分 类 号：TQ131[化学工程—无机化工]