Solvothermal liquefaction (STL) is a thermochemical conversion method that uses sub-or supercritical solvents to convert waste plastics like waste polyurethane (PU) into value-added chemicals. This study aimed to evaluate catalytic STL utilizing toluene as a solvent for depolymerization of waste PU into valuable products. The effect of catalyst type (Pt/C, Pd/C, and Ru/C), catalyst loading (0–10 wt%), STL reaction temperature (330°C, 350°C, and 370°C), STL residence time (1, 3, and 5 h), and hydrogen loading (25, 50, and 75 bar) on STL conversion were studied. Results showed that Ru/C outperformed Pt/C and Pd/C and the STL conversion reached to as high as 87.2%. The concentrations of nitrogen-containing components like aniline and p-aminotoluene were increased with the increase of Ru/C loading and STL reaction temperature.

中文翻译：

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贵金属催化剂存在下超临界甲苯溶剂热液化废聚氨酯

溶剂热液化 (STL) 是一种热化学转化方法，它使用亚临界或超临界溶剂将废塑料如废聚氨酯 (PU) 转化为增值化学品。本研究旨在评估利用甲苯作为溶剂将废 PU 解聚成有价值产品的催化 STL。催化剂类型（Pt/C、Pd/C 和 Ru/C）、催化剂负载量（0-10 wt%）、STL 反应温度（330°C、350°C 和 370°C）、STL 停留时间的影响研究了 STL 转化的时间（1、3 和 5 小时）和氢负载（25、50 和 75 巴）。结果表明，Ru/C优于Pt/C和Pd/C，STL转化率高达87.2%。苯胺和对氨基甲苯等含氮组分的浓度随着Ru/C负载量和STL反应温度的增加而增加。