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首页> 外文会议>Proceedings of the 20th international conference on fluidized bed combustion(FBC) >KINETICS OF OXIDATION OF A REDUCED FORM OF THE Cu-BASED OXYGEN-CARRIER FOR USE IN CHEMICAL-LOOPING COMBUSTION
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KINETICS OF OXIDATION OF A REDUCED FORM OF THE Cu-BASED OXYGEN-CARRIER FOR USE IN CHEMICAL-LOOPING COMBUSTION

机译：用于化学环流燃烧的还原形式的铜基载氧体的氧化动力学

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A co-precipitated mixture of CuO and Al2O3 is a good oxygen-carrier for chemical-looping combustion. The kinetics of regeneration of this reduced oxygen-carrier (355 – 500 μm) were measured from 300 to 750℃ when reacting it with O2. Care was taken to ensure these measurements were not affected by interphase mass transfer. Efforts were also made to minimise sampling problems by using a rapid-response mass spectrometer for reactions lasting for 45 s or less; otherwise, a paramagnetic analyser for O2 was used, since the mass spectrometer drifted with time. The order of reaction with respect to O2 was found to be ~ unity at 300 to 750℃. Below 600℃, the reduced oxygen-carrier was incompletely oxidised to a mixture of Cu2O and Al2O3. Above 600℃, regeneration was completely to CuO and Al2O3 and was controlled to a considerable extent by external mass transfer. At these higher temperatures, regeneration involved a shrinking core mechanism and the two consecutive steps: 2Cu + 1/2O2 → Cu2O, (1) Cu2O + 1/2O2 → 2CuO. (2) The activation energies and pre-exponential factors for both reactions were measured from initial rates. The kinetics in the first cycle of operations were found to be similar to those in the subsequent cycles.
机译：CuO和Al2O3的共沉淀混合物是化学循环燃烧的良好氧载体。在300至750℃下与氧气反应时，可测量该还原型氧载体（355 – 500μm）的再生动力学。注意确保这些测量不受相间传质的影响。还通过使用快速反应质谱仪对反应持续45 s或更短的时间来最大程度地减少了采样问题。否则，将使用O2的顺磁分析仪，因为质谱仪会随时间漂移。发现相对于O 2的反应顺序在300至750℃为〜1。在600℃以下，还原的氧载体被不完全氧化为Cu2O和Al2O3的混合物。在600℃以上，再生完全转化为CuO和Al2O3，并在相当程度上受到外部传质的控制。在这些较高的温度下，再生涉及收缩的芯机理和两个连续步骤：2Cu + 1 / 2O2→Cu2O，（1）Cu2O + 1 / 2O2→2CuO。 （2）从初始速率测量两个反应的活化能和指数前因子。发现在第一个操作循环中的动力学与随后的循环中的动力学相似。

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