Polypropylene and carbon dioxide were converted into syngas and solid nanostructured carbon particles. A direct current steam plasma torch provided the high enthalpy for the endothermic process. If the plasma process is powered by renewable electricity, it can be an environmentally viable method for waste treatment, energy conversion, and CO utilization. The temperature measured on the walls of the reactor was in the range of 1,150 and 1,350 °C, but the temperature of the heat source (steam plasma) was around 10,000 °C. The gasifying agent (carbon dioxide) was injected into the reactor at two gasification ratios (sub-stoichiometric or above-stoichiometric). The carbon dioxide conversion rate achieved was 98.5 %. The characterization of the produced nanostructured solid carbon (by HRTEM, SEM, XPS, XRD, EDS and GC–MS) confirmed the complete conversion of polypropylene, as no remnants were found in the product. The nanostructured carbon produced can be used for polymer and tire reinforcement and create additional value for the process as a side product of synthesis gas generation from plastic waste and CO.

中文翻译：

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聚丙烯等离子体气化具有巩固塑料处理、二氧化碳利用和可再生电力存储的多重优势

聚丙烯和二氧化碳被转化为合成气和固体纳米结构碳颗粒。直流蒸汽等离子炬为吸热过程提供高热函。如果等离子工艺由可再生电力提供动力，那么它可以成为一种环保可行的废物处理、能源转换和二氧化碳利用方法。反应器壁上测得的温度在 1,150 至 1,350 °C 范围内，但热源（蒸汽等离子体）的温度约为 10,000 °C。将气化剂（二氧化碳）以两种气化比（低于化学计量或高于化学计量）注入反应器中。二氧化碳转化率为98.5%。所生产的纳米结构固体碳的表征（通过 HRTEM、SEM、XPS、XRD、EDS 和 GC-MS）证实了聚丙烯的完全转化，因为在产品中没有发现任何残留物。生产的纳米结构碳可用于聚合物和轮胎增强，并作为塑料废物和二氧化碳生成合成气的副产品，为该过程创造附加价值。