CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People's Republic of China.
University of the Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
J Am Chem Soc. 2023 Jan 25;145(3):1847-1854. doi: 10.1021/jacs.2c11407. Epub 2023 Jan 12.
To solve the serious environmental problem and huge resource waste of plastic pollution, we report a tandem catalytic conversion of low-density polyethylene (LDPE) into naphtha, the key feedstock for renewable plastic production. Using β zeolite and silicalite-1-encapsulated Pt nanoparticles (Pt@S-1), a naphtha yield of 89.5% is obtained with 96.8% selectivity of C-C hydrocarbons at 250 °C. The acid sites crack long-chain LDPE into olefin intermediates, which diffuse within the channels of Pt@S-1 to encounter Pt nanoparticles. The hydrogenation over confined metal matches cracking steps by selectively shipping the olefins with right size, and the rapid diffusion boosts the formation of narrow-distributed alkanes. A conceptual upgrading indicates it is suitable for closing the plastic loop, with a significant energy saving of 15% and 30% reduced greenhouse gas emissions.
为了解决严重的环境问题和塑料污染造成的巨大资源浪费，我们报告了一种将低密度聚乙烯（LDPE）转化为石脑油的串联催化转化方法，石脑油是可再生塑料生产的关键原料。使用β沸石和硅沸石-1 封装的 Pt 纳米粒子（Pt@S-1），在 250°C 下可得到 89.5%的石脑油收率和 96.8%的 C-C 碳氢化合物选择性。酸位将长链 LDPE 裂化成烯烃中间体，这些中间体在 Pt@S-1 的通道内扩散，遇到 Pt 纳米粒子。受限金属上的加氢通过选择性输送具有合适尺寸的烯烃与裂解步骤相匹配，快速扩散促进了窄分布烷烃的形成。概念升级表明，它适合于闭环塑料循环，可节能 15%，减少温室气体排放 30%。
