摘要
Polyolefins have the largest share in plastic waste,so it is vital to transform these end-of-life wastes into highly valued products.We present here a new catalytic method to produce aromatics using PE as a carbon source.Our results indicate that polyethylene(PE)and CO_(2)can be converted into aromatics and CO simultaneously,achieving a high transformation rate and a 64.0%selectivity toward aromatics below 400℃ by Cu-Fe_(3)O_(4)and Zn/ZSM-5 tandem catalysis.Notably,the established theoretical limit of 50%selectivity toward aromatics in PE aromatization is surpassed.This is attributed to the coexistence of reverse water-gas shift,which converts another feed,CO_(2),with hydrogen to produce valuable CO,confirmed by^(13)C isotope studies.It consumes excessive hydrogen generated during PE aromatization to produce CO and mitigates the production of light alkanes from hydrogen transfer reactions,thereby augmenting the formation of aromatic compounds.Our research offers a new approach to valorizing two prevalent waste carbon sources:waste plastic and CO_(2),which is useful for designing a new strategy for upcycling waste carbon resources.
基金
supported by the National Key R&D Program of China(grant nos.2021YFA1501700 and 2022YFA1504800)
National Science Foundation of China(grant nos.22272114,22072002,21725301,22232001,21932002,and 21821004)
Fundamental Research Funds from Sichuan University(grant no.2022SCUNL103)
the Funding for Hundred Talent Program of Sichuan University(grant no.20822041E4079)
D.M.acknowledges support from the Tencent Foundation through the XPLORER PRIZE.
