Upcycling of waste polyethylene terephthalate derived bis(2-hydroxyethyl) cyclohexane-1,4-dicarboxylate (BHCD) to valuable monomer (1,4-cyclohexanedimethanol, CHDM) can decrease the emission of CO and microplastics. In this work, a stable Cu-based catalyst (Cu/MgAlO) with strong metal-support interaction was synthesized via calcination and reduction of CuMgAl-LDH precursor. The properties of precursor and final catalyst were characterized using XRD, TG-DTA, N-adsorption, SEM/TEM, H-TPR, CO/NH-TPD and XPS techniques. It was found that Cu/MgAlO has high surface area, strong metal-support interaction and plenty basic sites. Cu/MgAlO exhibited prominent performance for the hydrogenation of PET-derived BHCD to CHDM among the tested Cu/MgAlO, Cu/MnAlO and Cu/ZnAlO catalyst. The yield of CHDM over Cu/MgAlO reached 98 % with a complete conversion of BHCD at 240 °C, 4 MPa and 0.525 ggh. Besides, it remains its activity for at least 80 h on stream under optimized condition. The structure-performance of these catalysts for the hydrogenation of BHCD to CHDM was discussed.

中文翻译：

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废PET降解双(2-羟乙基)环己烷-1,4-二甲酸酯在铜基催化剂上加氢制备1,4-环己烷二甲醇


将废弃的聚对苯二甲酸乙二醇酯衍生的双（2-羟乙基）环己烷-1,4-二甲酸酯（BHCD）升级回收为有价值的单体（1,4-环己烷二甲醇，CHDM）可以减少二氧化碳和微塑料的排放。在这项工作中，通过煅烧和还原 CuMgAl-LDH 前驱体合成了一种具有强金属-载体相互作用的稳定铜基催化剂 (Cu/MgAl2O)。使用 XRD、TG-DTA、N-吸附、SEM/TEM、H-TPR、CO/NH-TPD 和 XPS 技术对前驱体和最终催化剂的性能进行了表征。研究发现Cu/MgAl2O具有高比表面积、强金属-载体相互作用和丰富的碱性位点。在测试的Cu/MgAlO、Cu/MnAlO和Cu/ZnAlO催化剂中，Cu/MgAlO在PET衍生的BHCD氢化成CHDM方面表现出突出的性能。 CHDM 相对于 Cu/MgAl2O 的收率达到 98%，BHCD 在 240 °C、4 MPa 和 0.525 ggh 下完全转化。此外，在优化条件下，它在运行时至少可以保持 80 小时的活性。讨论了这些 BHCD 加氢制 CHDM 催化剂的结构和性能。