Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization

doi:10.1126/science.abc5441

GSTDTAP > 气候变化

DOI	10.1126/science.abc5441
	Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization
	Fan Zhang; Manhao Zeng; Ryan D. Yappert; Jiakai Sun; Yu-Hsuan Lee; Anne M. LaPointe; Baron Peters; Mahdi M. Abu-Omar; Susannah L. Scott
	2020-10-23
发表期刊	Science
出版年	2020
英文摘要	Most current plastic recycling involves chopping up the waste and repurposing it in materials with less stringent engineering requirements than the original application. Chemical decomposition at the molecular level could, in principle, lead to higher-value products. However, the carbon-carbon bonds in polyethylene, the most common plastic, tend to resist such approaches without exposure to high-pressure hydrogen. F. Zhang et al. now report that a platinum/alumina catalyst can transform waste polyethylene directly into long-chain alkylbenzenes, a feedstock for detergent manufacture, with no need for external hydrogen (see the Perspective by Weckhuysen). Science , this issue p. [437][1]; see also p. [400][2] The current scale of plastics production and the accompanying waste disposal problems represent a largely untapped opportunity for chemical upcycling. Tandem catalytic conversion by platinum supported on γ-alumina converts various polyethylene grades in high yields (up to 80 weight percent) to low-molecular-weight liquid/wax products, in the absence of added solvent or molecular hydrogen, with little production of light gases. The major components are valuable long-chain alkylaromatics and alkylnaphthenes (average ~C30, dispersity Ð = 1.1). Coupling exothermic hydrogenolysis with endothermic aromatization renders the overall transformation thermodynamically accessible despite the moderate reaction temperature of 280°C. This approach demonstrates how waste polyolefins can be a viable feedstock for the generation of molecular hydrocarbon products. [1]: /lookup/doi/10.1126/science.abc5441 [2]: /lookup/doi/10.1126/science.abe3873
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/300292
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Fan Zhang,Manhao Zeng,Ryan D. Yappert,et al. Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization[J]. Science,2020.
APA	Fan Zhang.,Manhao Zeng.,Ryan D. Yappert.,Jiakai Sun.,Yu-Hsuan Lee.,...&Susannah L. Scott.(2020).Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization.Science.
MLA	Fan Zhang,et al."Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization".Science (2020).