石墨成孔法制备的两种铜基载氧体释氧以及循环反应特性  

Study on the Oxygen Releasing and Circulation Reaction Properties of Two Cu-based Oxygen Carriers Prepared by Impregnation Method Using Graphite as Pore-forming Agent

作　　者：蒲舸[1] 徐鹏[1] 张力[1] 

机构地区：[1]低品位能源利用技术及系统教育部重点实验室(重庆大学),重庆市沙坪坝区400030

出　　处：《中国电机工程学报》2013年第35期67-72,12,共6页Proceedings of the CSEE

基　　金：重庆市科技攻关重点计划项目(CSTC2009AA7051);重庆市自然科学基金计划项目(CSTC2010BB6067);重庆市重点自然科学基金计划项目(CSTC2013jjB90003)~~

摘　　要：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1 000℃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。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.

关 键 词：氧解耦化学链燃烧 石墨成孔 铜基载氧体 释氧特性 循环稳定性 

分 类 号：TK16[动力工程及工程热物理—热能工程]