Polyethylene Terephthalate Deconstruction Catalyzed by a Carbon‐Supported Single‐Site Molybdenum‐Dioxo Complex

作者：Yosi Kratish, Jiaqi Li, Shanfu Liu, Yanshan Gao, Tobin Jay Marks · 发表于：Angewandte Chemie International Edition · 年份：2020 · DOI：10.1002/anie.202007423 · 被引用次数：216 · 研究领域：biodegradable polymer synthesis and properties、Polyoxometalates: Synthesis and Applications、Carbon dioxide utilization in catalysis

Abstract Polyethylene terephthalate (PET) is selectively depolymerized by a carbon‐supported single‐site molybdenum‐dioxo catalyst to terephthalic acid (PTA) and ethylene. The solventless reactions are most efficient under 1 atmosphere of H 2 . The catalyst exhibits high stability and can be recycled multiple times without loss of activity. Waste beverage bottle PET or a PET + polypropylene (PP) mixture (simulating the bottle + cap) proceeds at 260 °C with complete PET deconstruction and quantitative PTA isolation. Mechanistic studies with a model diester, 1,2‐ethanediol dibenzoate, suggest the reaction proceeds by initial retro‐hydroalkoxylation/β‐C−O scission and subsequent hydrogenolysis of the vinyl benzoate intermediate.