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首页> 外文期刊>Environmental Engineering Science >Role of copper compounds in the De novo synthesis of polychlorinated dibenzo-p-dioxins/dibenzofurans
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Role of copper compounds in the De novo synthesis of polychlorinated dibenzo-p-dioxins/dibenzofurans

机译:铜化合物在多氯联苯对二恶英/二苯并呋喃的从头合成中的作用

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摘要

When aqueous extracted fly ash in heated only small amounts of PCDD/F are formed. Addition of CuCl or CuCl_2 enhances formation rates drastically. With CuCl, the reaction is first-order in[Cu~+]. With CuCl_2, the formation is first-order in[Cu~2+]when[Cu~2+]<160μ mol/g; at higher concen- Trations, the apparent dependence suggests either another first-order reaction(but with a different Slope)or an exponential increase. Both compounds favor formation of hepta and octa homologs at Higher concentrations. Rates of formation are comparable for CuCl and CuCl_2. The decline of PCDD/F formation with time for CuCl_2 and inactivity of unchlorinated source compounds in This reaction suggests that CuCl and CuCl_2 are more important as a chlorine source than as a true Catalyst.
机译:当在加热条件下提取含水粉煤灰时,仅形成少量的PCDD / F。 CuCl或CuCl_2的添加大大提高了形成速率。对于CuCl,反应是[Cu〜+]中的一级反应。用CuCl_2,当[Cu〜2 +] <160μmol / g时,在[Cu〜2 +]中形成一级。在较高浓度下,表观依赖性表明另一种一阶反应(但斜率不同)或呈指数增长。两种化合物都有助于在较高浓度下形成七和八位同系物。 CuCl和CuCl_2的形成速率相当。 CuCl_2的PCDD / F形成随时间的下降以及未氯化的源化合物的失活该反应表明,CuCl和CuCl_2作为氯源比作为真正的催化剂更重要。

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