Efficient and selective degradation of polyethylenes into liquid fuels and waxes under mild conditions.
Efficient and selective degradation of polyethylenes into liquid fuels and waxes under mild conditions.
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在温和条件下将聚乙烯高效选择性降解为液体燃料和蜡
DOI：
10.1126/sciadv.1501591
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发表时间：
2016-06
期刊：
影响因子：
13.6
通讯作者：
Huang Z
中科院分区：
文献类型：
--
作者：
Jia X;Qin C;Friedberger T;Guan Z;Huang Z
催化烷烃复分解提供了聚乙烯废物到有价值的燃料和蜡的温和和选择性降解。聚乙烯（PE）是体积最大的合成聚合物，其化学惰性使其通过低能量过程降解成为一个具有挑战性的问题。报道了一种在温和条件下高效降解聚乙烯的串联催化交叉烷烃复分解方法。通过使用广泛可用的低价值短链烷烃（例如石油醚）作为交叉复分解伙伴，具有各种分子量的不同类型的聚乙烯经历完全转化成有用的液体燃料和蜡。该方法对直链烷烃的形成显示出优异的选择性，并且可以通过催化剂结构和反应时间来控制降解产物分布（液体燃料与蜡）。此外，该催化剂与各种聚烯烃添加剂相容;因此，普通塑料废物，如消费后的聚乙烯瓶，袋和薄膜，可以在不进行任何预处理的情况下转化为有价值的化学原料。
A catalytic alkane metathesis provides a mild and selective degradation of polyethylene wastes into valuable fuels and waxes. Polyethylene (PE) is the largest-volume synthetic polymer, and its chemical inertness makes its degradation by low-energy processes a challenging problem. We report a tandem catalytic cross alkane metathesis method for highly efficient degradation of polyethylenes under mild conditions. With the use of widely available, low-value, short alkanes (for example, petroleum ethers) as cross metathesis partners, different types of polyethylenes with various molecular weights undergo complete conversion into useful liquid fuels and waxes. This method shows excellent selectivity for linear alkane formation, and the degradation product distribution (liquid fuels versus waxes) can be controlled by the catalyst structure and reaction time. In addition, the catalysts are compatible with various polyolefin additives; therefore, common plastic wastes, such as postconsumer polyethylene bottles, bags, and films could be converted into valuable chemical feedstocks without any pretreatment.