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Hydrogenation of polyethylene terephthalate to environmentally friendly polyester over Vulcan XC-72 carbon supported Rh-Pt bimetallic catalyst
Catalysis Today ( IF 5.2 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.cattod.2020.09.013
Avinash B. Lende , Saurav Bhattacharjee , Chung-Sung Tan

This study demonstrates the direct hydrogenation of polyethylene terephthalate (PET) dissolved in 1,1,1,3,3,3-hexafluro-2-propanol to environmentally friendly polyester polyethylene-1,4-cyclohexanedicarboxylate (PECHD) using a Vulcan XC-72 supported Rh-Pt bimetallic catalyst synthesized via a polyol method. The hydrogenation of PET was promoted by RhOx species present on the catalyst support surface which was generated using the polyol synthesis method. As compared to the monometallic Rh catalyst, the Rh-Pt bimetallic catalyst was found to be superior for hydrogenation of PET. This superiority was attributed to the strong aromatic ring adsorption ability of Rh working in synergy with an increased H2 spillover by Pt. At a H2 pressure of 6.89 MPa and 50 °C for 60 min, complete hydrogenation of PET to PECHD was achieved over the Rh-Pt bimetallic catalyst possessing theoretical Rh and Pt metal loadings of 2.5 wt% each. PECHD was found to be recovered to a very high extent using the compressed CO2 anti-solvent technique after hydrogenation of PET.



中文翻译:

Vulcan XC-72碳负载Rh-Pt双金属催化剂上聚对苯二甲酸乙二醇酯加氢制环保聚酯

本研究展示了使用 Vulcan XC- 将溶解在 1,1,1,3,3,3-hexafluro-2-丙醇中的聚对苯二甲酸乙二醇酯 (PET) 直接氢化为环保型聚酯聚乙烯-1,4-环己烷二甲酸酯 (PECHD)通过多元醇法合成的 72 负载型 Rh-Pt 双金属催化剂。使用多元醇合成方法生成的催化剂载体表面上存在的 RhO x物质促进了 PET 的氢化。与单金属 Rh 催化剂相比,Rh-Pt 双金属催化剂在 PET 加氢方面表现出众。这种优势归因于Rh的强芳环吸附能力与Pt增加的H 2溢出协同作用。在 H 2在 6.89 MPa 的压力和 50°C 的压力下 60 分钟,在 Rh-Pt 双金属催化剂上实现了 PET 完全氢化成 PECHD,理论上 Rh 和 Pt 金属负载量分别为 2.5 wt%。发现在 PET 氢化后使用压缩 CO 2反溶剂技术可以非常高地回收 PECHD 。

更新日期:2020-09-22
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