Polyvinyl chloride (PVC) is ubiquitous in everyday life; however, it is not recycled because it degrades uncontrollably into toxic products above 250°C. Therefore, it is of interest to controllably dechlorinate PVC at mild temperatures to generate narrowly distributed carbon materials. We present a catalytic route to dechlorinate PVC (~90% reduction of Cl content) at mild temperature (200°C) to produce gas H 2 (with negligible coproduction of corrosive gas HCl) and carbon materials using Ga as a liquid metal (LM) catalyst. A LM was used to promote intimate contact between PVC and the catalytic sites. During dechlorination of PVC, Cl is sequestrated in the carbonaceous solid product. Later, chlorine is easily removed with an acetone wash at room temperature. The Ga LM catalyst is reusable, outperforms a traditional supported metal catalyst, and successfully converts (untreated) discarded PVC pipe.

中文翻译：

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使用液态金属催化剂对聚氯乙烯（PVC）进行低温脱氯生产H 2 和碳材料


聚氯乙烯（PVC）在日常生活中无处不在；然而，它不会被回收，因为它在 250°C 以上会失控地降解成有毒产品。因此，在温和的温度下可控地对 PVC 进行脱氯以生成窄分布的碳材料是很有意义的。我们提出了一种在温和温度 (200°C) 下对 PVC 进行脱氯（Cl 含量减少约 90%）的催化路线，以产生气体 H 2 （同时产生的腐蚀性气体 HCl 可以忽略不计）和使用 Ga 作为液态金属的碳材料 (LM ）催化剂。 LM 用于促进 PVC 和催化位点之间的紧密接触。在 PVC 脱氯过程中，Cl 被隔离在碳质固体产物中。随后，在室温下用丙酮清洗即可轻松去除氯。 Ga LM 催化剂可重复使用，性能优于传统的负载金属催化剂，并成功转化（未经处理的）废弃 PVC 管道。