Selective Hydrocracking of Waste Polyolefins toward Gasoline-Range Liquid Fuels via Tandem Catalysis over a Cerium-Promoted Pt/HY Catalyst

Zhao, Pengcheng; Guo, W.; Gui, Zhipeng; Jiang, Jie; Zhu, Zhihua; Li, Jin Jin; Zhao, Ling; Zhou, Jian; Xi, Zhenhao

doi:10.1021/acssuschemeng.3c04163

Selective Hydrocracking of Waste Polyolefins toward Gasoline-Range Liquid Fuels via Tandem Catalysis over a Cerium-Promoted Pt/HY Catalyst

Title

Selective Hydrocracking of Waste Polyolefins toward Gasoline-Range Liquid Fuels via Tandem Catalysis over a Cerium-Promoted Pt/HY Catalyst

Author

Zhao, Pengcheng (East China University of Science and Technology)
Guo, W. (TU Delft Large Scale Energy Storage; East China University of Science and Technology)
Gui, Zhipeng (East China University of Science and Technology)
Jiang, Jie (East China University of Science and Technology)
Zhu, Zhihua (East China University of Science and Technology)
Li, Jin Jin (East China University of Science and Technology)
Zhao, Ling (East China University of Science and Technology)
Zhou, Jian (Sinopec Research Institute of Petroleum Engineering)
Xi, Zhenhao (East China University of Science and Technology)

Date

2024

Abstract

Upcycling of waste plastics into value-added chemicals and fuels represents a promising orientation toward a more sustainable chemical industry. We present a selective process for hydrocracking waste polyolefins into a spectrum of branched gasoline-range C_5-12 hydrocarbons, utilizing a cerium-promoted Pt/HY as a metal-acid bifunctional catalyst. The HY zeolite was engineered with a hierarchical meso/microporosity and moderated acidity to alleviate the overcracking of intermediate hydrocarbons to light C_1-4 gas products. The cerium presented as a surface cerium oxide phase, which mitigated acidity and significantly improved Pt dispersion. Upon a proper metal-acid balance, an optimized yield of C_5-12 up to 85 wt % was achieved from the low-density polyethylene over a cerium-promoted Pt/HY catalyst at 280 °C and 2 MPa H₂ for 2 h. The tandem catalysis was proposed to proceed with an initial dehydrogenation of the polymer chain over Pt sites, with subsequent isomerization and cracking over the Brønsted acid sites and hydrogenation of the olefin intermediates over Pt sites. The strong Pt-O-Ce bridging structure inhibited the migration and agglomeration of Pt atoms, affording good stability and no distinct performance loss over three sequential runs. This process is applicable to the hydrocracking of other polyolefins such as high-density polyethylene, polypropylene, and daily plastic bags to gasoline-range fuels in desirable yields (60-80 wt %).

Subject

bifunctional catalyst
cerium oxide
gasoline
hydrocracking
platinum
polyolefin

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http://resolver.tudelft.nl/uuid:70a26cc8-44fd-465a-a418-6b9c1bed28d1

DOI

https://doi.org/10.1021/acssuschemeng.3c04163

Embargo date

2024-09-15

ISSN

2168-0485

Source

ACS Sustainable Chemistry and Engineering, 12 (15), 5738-5752

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Part of collection

Institutional Repository

Document type

journal article

Rights

Files

file embargo until 2024-09-15