聚烯烃
聚丙烯
聚乙烯
催化作用
异丁烯
脱氢
材料科学
烯烃纤维
有机化学
乙烯
聚合物
环氧丙烷
化学工程
高分子化学
化学
环氧乙烷
图层(电子)
工程类
共聚物
作者
Richard J. Conk,Jules F. Stahler,Jake X. Shi,Ji Yang,Natalie G. Lefton,John N. Brunn,Alexis T. Bell,John F. Hartwig
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2024-08-29
标识
DOI:10.1126/science.adq7316
摘要
The selective conversion of polyethylene, polypropylene, and mixtures of the two polymers to form products with high volume demand is urgently needed because current methods suffer from low selectivity, produce large quantities of greenhouse gases, or rely on expensive, single-use catalysts. The isomerizing ethenolysis of unsaturated polyolefins could be an energetically and environmentally viable route to propylene and isobutylene, but noble-metal homogeneous catalysts and an unsaturated polyolefin are currently required, and the process has been limited to polyethylene. We show that the simple combination of tungsten oxide on silica and sodium on gamma-alumina transforms polyethylene, polypropylene, or a mixture of the two, including post-consumer forms of these materials, to propylene or a mixture of propylene and isobutylene in greater than 90% yield at 320°C without the need for dehydrogenation of the starting polyolefins.
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