Du Bowen, Chen Xiao, Ling Yu, Niu Tiantian, Guan Weixiang, Meng Jipeng, Hu Haoquan, Tsang Chi-Wing, Liang Changhai
State Key Laboratory of Fine Chemicals & Laboratory of Advanced Materials and Catalytic Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P. R. China.
State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P. R. China.
ChemSusChem. 2023 Feb 8;16(3):e202202035. doi: 10.1002/cssc.202202035. Epub 2023 Jan 5.
Upcycling of waste polyolefin plastics still meets with economic and technological challenges in practice. In this work, the catalytic hydrogenolysis-isomerization of nondegradable polyolefin plastic waste to high-value gasoline, diesel, and light lubricants with highly branched chain is achieved over a bifunctional Rh/Nb O catalyst under relatively mild conditions. Owing to the high efficiency of metallic Rh active sites, the dehydrogenation/hydrogenation of long carbon chains of polyolefins is enhanced. With the assistance of strong Brønsted acidity of Nb O , the cleavage of C-C bonds, skeletal rearrangements, as well as the β-scission of alkylcarbenium ions occurs, which boosts the one-step solvent-free catalytic hydrogenolysis and isomerization of polyolefins. In addition, the preliminary economic analysis shows that this technology is economical, feasible, and has great potential in accelerating the transition to a circular plastics economy for sustainable development.
废弃聚烯烃塑料的升级回收在实际应用中仍面临经济和技术挑战。在这项工作中，通过双功能Rh/Nb₂O₅催化剂，在相对温和的条件下实现了不可降解聚烯烃塑料废料催化氢解异构化为高价值的汽油、柴油和具有高度支链的轻质润滑油。由于金属Rh活性位点的高效性，增强了聚烯烃长碳链的脱氢/氢化反应。在Nb₂O₅强布朗斯台德酸性的辅助下，发生了C-C键的断裂、骨架重排以及烷基碳正离子的β-裂解，这促进了聚烯烃的一步无溶剂催化氢解和异构化反应。此外，初步的经济分析表明，该技术经济可行，在加速向循环塑料经济转型以实现可持续发展方面具有巨大潜力。
