CAJ | 학술논문

通过石墨成孔浸渍法制备了Cu6Ti4和Cu6Si4这2种氧解耦化学链燃烧铜基载氧体，并利用热重分析仪、X衍射仪和扫描电镜对其进行了研究，主要考察了不同反应温度和不同氧气分压下的释氧特性，以及1000℃温度下的循环稳定特性等。热重实验结果表明：随着反应温度的增加，载氧体的转化速率，即载氧体中氧气的释放速率加快。Cu6Ti4载氧体在温度较低时的释氧性能要优于 Cu6Si4载氧体，且Cu6Ti4载氧体在不同氧气分压下的开始释氧温度都要低于Cu6Si4载氧体。经过20次释氧/吸氧往复循环后，Cu6Si4载氧体仍然保持着很好的释氧吸氧能力，载氧量仅下降0.5%，而Cu6Ti4载氧体下降了1.5%。通过扫描电镜观察了两种载氧体循环反应前后的物相结构，结果发现 Cu6Si4载氧体经过20次反应后，其表面结构仍有多孔结构，有利于氧气的析出和结合。
통과석묵성공침지법제비료Cu6Ti4화Cu6Si4저2충양해우화학련연소동기재양체，병이용열중분석의、X연사의화소묘전경대기진행료연구，주요고찰료불동반응온도화불동양기분압하적석양특성，이급1000℃온도하적순배은정특성등。열중실험결과표명：수착반응온도적증가，재양체적전화속솔，즉재양체중양기적석방속솔가쾌。Cu6Ti4재양체재온도교저시적석양성능요우우 Cu6Si4재양체，차Cu6Ti4재양체재불동양기분압하적개시석양온도도요저우Cu6Si4재양체。경과20차석양/흡양왕복순배후，Cu6Si4재양체잉연보지착흔호적석양흡양능력，재양량부하강0.5%，이Cu6Ti4재양체하강료1.5%。통과소묘전경관찰료량충재양체순배반응전후적물상결구，결과발현 Cu6Si4재양체경과20차반응후，기표면결구잉유다공결구，유리우양기적석출화결합。
Two Cu-based oxygen carriers for Chemical-looping with oxygen uncoupling (CLOU) process were prepared by impregnation method using graphite as pore-forming agent. The oxygen releasing properties of the carriers under different oxygen partial conditions and different temperatures as well as the cyclic stability property were tested using thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that the conversion rate of oxygen carrier increases with the increase of temperature. The oxygen releasing property of Cu6Ti4 oxygen carrier at low temperature was better than Cu6Si4 oxygen carrier. In addition, the initial oxygen release temperature of Cu6Ti4 oxygen carrier under different oxygen concentration was lower than that of Cu6Si4 oxygen carrier. After 20 cycles, the Cu6Si4 oxygen carrier still remains a good oxygen uncoupling and absorption properties, there is only 0.5%loss in oxygen release content compared to 1.5% loss of Cu6Ti4 oxygen carrier. SEM observations on phase structure of these two kinds of Cu-based oxygen carriers find that the surface of Cu6Si4 remains porous structure, which is favorable for the release and absorption of oxygen.