氢解
催化作用
脱氢
甲醇
化学
对苯二甲酸
聚对苯二甲酸乙二醇酯
对苯二甲酸二甲酯
材料科学
有机化学
高分子化学
光化学
聚酯纤维
复合材料
作者
Ryan Helmer,Siddhesh S. Borkar,Aojie Li,Fatima Mahnaz,Jenna Vito,Michelle Bishop,Ashfaq Iftakher,M. M. Faruque Hasan,Srinivas Rangarajan,Manish Shetty
标识
DOI:10.1002/anie.202416384
摘要
Abstract We demonstrate a novel approach of utilizing methanol (CH 3 OH) in a dual role for (1) the methanolysis of polyethylene terephthalate (PET) to form dimethyl terephthalate (DMT) at near‐quantitative yields (~97 %) and (2) serving as an in situ H 2 source for the catalytic transfer hydrogenolysis (CTH) of DMT to p‐xylene (PX, ~63 % at 240 °C and 16 h) on a reducible ZnZrO x supported Cu catalyst (i.e., Cu/ZnZrO x ). Pre‐ and post‐reaction surface and bulk characterization, along with density functional theory (DFT) computations, explicate the dual role of the metal‐support interface of Cu/ZnZrO x in activating both CH 3 OH and DMT and facilitating a lower free‐energy pathway for both CH 3 OH dehydrogenation and DMT hydrogenolysis, compared to Cu supported on a redox‐neutral SiO 2 support. Loading studies and thermodynamic calculations showed that, under reaction conditions, CH 3 OH in the gas phase, rather than in the liquid phase, is critical for CTH of DMT. Interestingly, the Cu/ZnZrO x catalyst was also effective for the methanolysis and hydrogenolysis of C−C bonds (compared to C−O bonds for PET) of waste polycarbonate (PC), largely forming xylenol (~38 %) and methyl isopropyl anisole (~42 %) demonstrating the versatility of this approach toward valorizing a wide range of condensation polymers.
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