Chemical looping with oxygen uncoupling (CLOU) represents a potentially high-efficiency approach to capture CO₂ in the utilization of solid fuels. With the presence of complex mineral matters in solid fuels, the interaction between oxygen carrier and coal-derived ash in CLOU was necessary to be well understood. In this work, three typical coal ashes were selected and mixed with a Cu-based oxygen carrier (OC), and their impacts on the chemical and physical behavior of the oxygen carrier were studied comprehensively. The factor including coal ash types, ash content, CLOU cycle number, and reaction kinetics was evaluated. The results suggest that the presence of ash could lead to an obvious decrease of solid conversion during oxygen uncoupling. The most probable reason was attributed to the consumption of dissociate CuO with the formation of CuAl₂O₄. With the mass ratio of ash increased, the oxygen-releasing ability of samples was seen to become worse. Both of these effects tended to be a bit more serious after cyclic operation. Not only that, with the presence of ash, the reaction activation energy became higher and the reaction type changed from shrinking-core model to the nucleation and nuclei growth model.

中文翻译：

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含煤灰的铜基氧载体在化学循环过程中的氧解偶联

氧气解偶联（CLOU）的化学循环代表了捕获CO ₂的潜在高效方法固体燃料的利用。由于固体燃料中存在复杂的矿物物质，因此必须充分了解CLOU中氧气载体与煤灰分之间的相互作用。在这项工作中，选择了三种典型的煤灰并将其与铜基氧气载体（OC）混合，并全面研究了它们对氧气载体的化学和物理行为的影响。评价了包括煤灰类型，灰分含量，CLOU循环数和反应动力学在内的因素。结果表明，灰分的存在可能导致氧解偶联过程中固体转化率明显下降。最可能的原因是由于消耗了离解的CuO并形成了CuAl ₂ O _4。。随着灰分质量比的增加，样品的释氧能力变差。循环操作后，这两种影响都趋于严重一些。不仅如此，在存在灰分的情况下，反应活化能变高，反应类型从缩核模型变为成核和核生长模型。