A reusable, impurity-tolerant and noble metal-free catalyst for hydrocracking of waste polyolefins.

A reusable, impurity-tolerant and noble metal-free catalyst for hydrocracking of waste polyolefins.
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DOI:
10.1126/sciadv.adg5332
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发表时间:
2023-06-23
期刊:
影响因子:
13.6
通讯作者:
Lin, Bo-Lin
Lin, Bo-Lin
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Qiu, Zetian;Lin, Siyu;Chen, Zhuo;Chen, Anqi;Zhou, Yitian;Cao, Xudong;Wang, Yu;Lin, Bo-Lin

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One-step conversion of low-purity polyolefins to value-added products without pretreatments represents a great opportunity for chemical recycling of waste plastics. However, additives, contaminants, and heteroatom-linking polymers tend to be incompatible with catalysts that break down polyolefins. Here, we disclose a reusable, noble metal–free and impurity-tolerant bifunctional catalyst, MoSx-Hbeta, for hydroconversion of polyolefins into branched liquid alkanes under mild conditions. The catalyst works for a wide scope of polyolefins, including different kinds of high–molecular weight polyolefins, polyolefins mixed with various heteroatom-linking polymers, contaminated polyolefins, and postconsumer polyolefins with/without cleaning under 250°C and 20 to 30 bar H2 in 6 to 12 hours. A 96% yield of small alkanes was successfully achieved even at a temperature as low as 180°C. These results demonstrate the great potentials of hydroconversion in practical use of waste plastics as a largely untapped carbon feedstock. MoSx-Hbeta efficiently catalyzes the hydroconversion of low-purity polyolefins to valuable alkanes under mild conditions.
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