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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

, PP. 67-72

Keywords: 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

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Abstract:

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。

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