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Dynamic change of copper in fly ash during de novo synthesis of dioxins

机译：从头合成二恶英期间粉煤灰中铜的动态变化

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Although many researchers have reported that copper chloride is an important catalyst that generates relatively large amounts of dioxins in heat experiments involving model fly ash, details on the behavior of copper during the process are still unavailable. In this study, we used in situ XANES experiments involving one type of real fly ash, which originated from a municipal solid-waste incinerator (MSWI), and two fly ash models to investigate the behavior of copper in fly ash at temperatures that are suitable for de novo synthesis, which is the major formation route for dioxins during waste incineration and thermal processes. Cupric compounds in real fly ash and model fly ash A (CuCl2' 2H(2)O + activated carbon (AC) + boron nitride (BN)) were reduced to cuprous compounds or elemental copper at low temperatures. The changes in the Cu XANES spectra of real fly ash were similar to those of model fly ash A and those of an oxychlorination catalyst. In model fly ash B (CuO + AC + KCl + BN), CuO did not vary dramatically in the temperature range studied. In this study, we found strong evidence that oxychlorination, the key mechanistic step in the formation of dioxins, occurred in both real MSWI and model fly ash.
机译：尽管许多研究人员报告说，氯化铜是一种重要的催化剂，在涉及模型粉煤灰的热实验中会生成相对大量的二恶英，但有关该过程中铜行为的详细信息仍然不详。在这项研究中，我们使用原位XANES实验，该实验涉及一种类型的真正粉煤灰，该粉煤灰源自市政固体废物焚化炉（MSWI），并且使用两种粉煤灰模型研究了适合温度下粉煤灰中铜的行为。从头合成，这是废物焚烧和热过程中二恶英的主要形成途径。实际粉煤灰和模型粉煤灰A（CuCl2'2H（2）O +活性炭（AC）+氮化硼（BN））中的铜化合物在低温下还原为亚铜化合物或元素铜。实际粉煤灰的Cu XANES光谱变化与模型粉煤灰A和氧氯化催化剂的变化相似。在模型粉煤灰B（CuO + AC + KCl + BN）中，CuO在所研究的温度范围内变化不大。在这项研究中，我们发现有力的证据表明，氧化氯是形成二恶英的关键机理，是在真实MSWI和模型粉煤灰中均发生的。

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