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首页> 外文期刊>Journal of environmental monitoring: JEM >Dechlorination of pentachlorophenol in supercritical carbon dioxide with zero-valent palladium-magnesium bimetallic mixture
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Dechlorination of pentachlorophenol in supercritical carbon dioxide with zero-valent palladium-magnesium bimetallic mixture

机译：零价钯-镁双金属混合物在超临界二氧化碳中对五氯苯酚进行脱氯

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摘要

A stream of substrate pentachlorophenol [PCP, 5 mg min~(-1) in water-methanol (1 + 4, v/v)] was merged with 1.5 ml min~(-1) of supercritical carbon dioxide (scCO_2) and delivered to a reactor column (25 cm * 1 cm) of zero-valent palladium-magnesium mixture. The resulting dechlorinations, although very efficient, were not quantitative. For continuous operation at 400 ℃ for 6 h, phenol was the principal product, with lesser quantities of methylated products and only traces of chlorinated products (principally monochlorinated species). PCP deoxygenation was not observed and ring methylation was decreased relative to analogous reactions in hydroxylic organic solvent. With time, the reactor column slowly lost dechlorination activity. Reducing the loading of Pd~0 on Mg~0 from 2% to 1% (w/w) apparently did not change the course of the reaction; however, the dechlorination capacity was decreased correspondingly. None the less, over 6 h or 5 h of continued operation, the dechlorination efficiency was 0.995 for the 2% (w/w) loading of Pd~0 on Mg~0 and 0.984 for the 1% (w/w) loading.
机译：将五氯苯酚底物流[PCP，在水-甲醇（1 + 4，v / v）中的5 mg min〜（-1）]与1.5 ml min〜（-1）的超临界二氧化碳（scCO_2）合并，并输送到零价钯镁混合物的反应器塔（25厘米* 1厘米）中。产生的脱氯虽然非常有效，但不是定量的。对于在400℃下连续运行6小时，苯酚是主要产物，甲基化产物的量较少，而只有痕量的氯化产物（主要是单氯化物质）。相对于在羟基有机溶剂中的类似反应，未观察到PCP脱氧，环甲基化减少。随着时间的流逝，反应器塔逐渐失去脱氯活性。将Pd-0在Mg-0上的负载量从2％降低到1％（w / w）显然并没有改变反应的过程。但是，脱氯能力相应降低。尽管如此，在连续运行6小时或5小时后，Mg-0上2％（w / w）的Pd-0的脱氯效率为0.995，1％（w / w）的脱氯效率为0.984。

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