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首页> 外文期刊>Toxicological and Environmental Chemistry >CATALYTIC EFFECTS OF COPPER ON DIBENZO-p-DIOXIN AND POLYCHLORINATED DIBENZO-p-DIOXIN GENERATIONS USING AB INITIO MOLECULAR ORBITAL METHOD
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CATALYTIC EFFECTS OF COPPER ON DIBENZO-p-DIOXIN AND POLYCHLORINATED DIBENZO-p-DIOXIN GENERATIONS USING AB INITIO MOLECULAR ORBITAL METHOD

机译:从头算分子轨道方法研究铜对二苯并-对-二恶英和多氯联苯-对-二恶英生成的催化作用

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摘要

The roles played by copper in dibenzo-p-dioxin formation from the precursor phenol have been investigated using ab initio molecular orbital calculation, and the following catalytic roles of copper has been identified: (ⅰ) stabilization of the total energy owing to the absorption of phenol, (ⅱ) reduction of oxygen-hydrogen bond strength in phenol, and (ⅲ) reduction of steric effect of hydrogen atom in pre-dioxin. The catalytic effect of copper has been shown in terms of the smaller apparent activation energy. In the case of polychlorinated dibenzo-p-dioxins generation from precursor polychlorinated phenols, the catalytic roles (ⅰ), i.e., the stabilization of the total energy of precursor, would become even stronger. On the other hand, the catalytic roles (ⅱ) and (ⅲ) are unchangeable regardless of the existence of substituted chlorine atom.
机译:已使用从头算分子轨道计算研究了铜在由前体苯酚形成二苯并-对-二恶英中所起的作用,并确定了铜的以下催化作用:(ⅰ)由于吸收了三价铜而使总能量稳定(ⅱ)降低苯酚中氧-氢键的强度,以及(ⅲ)降低二恶英中氢原子的空间效应。以较小的表观活化能显示了铜的催化作用。在由前体多氯酚产生多氯代二苯并对二恶英的情况下,催化作用(ⅰ),即前体总能量的稳定化将变得更强。另一方面,无论取代的氯原子的存在如何,催化作用(ⅱ)和(ⅲ)是不变的。

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