The synergetic effect in using witherite (BaCO₃) and iron ore (IO) for simultaneous dechlorination and chemical looping combustion (CLC) of municipal solid waste (MSW) derived syngas was studied on a bench-scale fluidized bed reactor at the temperature range of 800-900 °C. For comparison, limestone a widely used HCl sorbent was also tested. It was found that the pristine IO had negligible HCl sorption capacity during CLC of syngas. The IO-witherite mixture demonstrated much higher HCl adsorption capacity than the pristine IO and IO-limestone mixture in the temperature range of 800 to 900 °C with the presence of 25-35 vol% H₂O in syngas. At the loading ratio 10 wt% of sorbent, the HCl removal capacity of IO-witherite was 3 times higher than that of the IO-limestone at 900 °C. Though IO and sorbent were physically mixed, a strong solid-solid interaction between IO and witherite surface occurred to form interstitial solid solution, BaFe₁₂O₁₉. The hexagonal structure of the BaFe₁₂O₁₉ facilitated the lattice oxygen mobility and thus improved greatly the redox performance of the IO. With increasing the inlet HCl concentration, the CLC performance of IO-Ba was further improved mainly because the chlorination process made the witherite particles more porous, which benefits the solid-solid interactions. The bulk spent witherite particles after processing could be separated easily from the IO particles by magnetic separation to realize the recovery of the used sorbents, while IO particles could be refilled into the CLC process. This research highlights that the IO-witherite mixture could be a promising OC for the CLC of HCl containing syngas to accomplish cleaner combustion.

在工作台规模的流化床反应器上，研究了利用堇青石（BaCO ₃）和铁矿石（IO）同时对市政固体废物（MSW）衍生的合成气进行脱氯和化学循环燃烧（CLC）的协同效应。 800-900°C。为了进行比较，还对石灰石（一种广泛使用的HCl吸附剂）进行了测试。发现原始IO在CLC合成气期间具有可忽略的HCl吸附能力。在存在25-35％（体积）H ₂的情况下，在800至900°C的温度范围内，IO-堇青石混合物的HCl吸附能力比原始IO和IO-石灰石混合物高得多。合成气中的O。在吸附剂的负载率为10 wt％的情况下，IO-堇青石在900°C下的HCl去除能力比IO-石灰石高3倍。尽管物理上混合了IO和吸附剂，但IO与堇青石表面之间发生了强烈的固-固相互作用，形成了间隙固溶体BaFe ₁₂ O ₁₉。BaFe ₁₂ O ₁₉的六边形结构促进了晶格的氧迁移率，从而大大提高了IO的氧化还原性能。随着入口HCl浓度的增加，IO-Ba的CLC性能进一步提高，这主要是因为氯化过程使堇青石颗粒更加多孔，有利于固-固相互作用。通过磁性分离，可以很容易地将处理后的大量消耗的堇青石颗粒与IO颗粒分离，以实现用过的吸附剂的回收，同时可以将IO颗粒重新填充到CLC工艺中。这项研究突出表明，对于含有HCl的合成气进行CLC净化，IO钙镁石混合物可能是很有希望的OC。