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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 kinds of oxygen-decoupled chemical oxygen demand copper-based oxygen carriers, Cu6Ti4 and Cu6Si4, were prepared by graphite impregnation impregnation method. The thermogravimetric analysis, X-ray diffraction and scanning electron microscopy were used to investigate the effects of different reactions Temperature and different oxygen partial pressure release oxygen characteristics, and 1 000 ℃ temperature cycle stability characteristics. Thermogravimetry results show that with the increase of reaction temperature, the conversion rate of oxygen carrier, that is, the release rate of oxygen in oxygen carrier, is accelerated. The oxygen release performance of Cu6Ti4 oxygen carrier is better than that of Cu6Si4 oxygen carrier at low temperature, and the initial oxygen release temperature of Cu6Ti4 oxygen carrier is lower than that of Cu6Si4 oxygen carrier at different oxygen partial pressures. After 20 cycles of oxygen release / oxygen recovery, Cu6Si4 oxygen carrier still maintained a good oxygen release and oxygen absorption capacity, oxygen carrier decreased by only 0.5%, while Cu6Ti4 oxygen carrier decreased by 1.5%. The phase structure of the two kinds of oxygen carriers before and after the cyclic reaction was observed by scanning electron microscopy. The results showed that the surface structure of the Cu6Si4 oxygen carrier is still porous with 20 reactions, which is in favor of the precipitation and bonding of oxygen.