Effect of pyrolysis operating conditions on the catalytic co‐pyrolysis of low‐density polyethylene and polyethylene terephthalate with zeolite catalysts

Okonsky, Sean Timothy; Hogan, Neil Robert; Toraman, Hilal Ezgi

doi:10.1002/aic.18548

Title: Effect of pyrolysis operating conditions on the catalytic co‐pyrolysis of low‐density polyethylene and polyethylene terephthalate with zeolite catalysts

Journal Article · 06 August 2024 · AIChE Journal

DOI: https://doi.org/10.1002/aic.18548 · OSTI ID:2427066

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Department of Chemical Engineering Pennsylvania State University University Park Pennsylvania USA
Department of Chemical Engineering Pennsylvania State University University Park Pennsylvania USA, Department of Energy and Mineral Engineering Pennsylvania State University University Park Pennsylvania USA, Institute of Energy and the Environment Pennsylvania State University University Park Pennsylvania USA

Abstract In this study, the catalytic (co‐)pyrolysis of low‐density polyethylene (LDPE) and polyethylene terephthalate (PET) with HZSM‐5 and HY zeolite catalysts was conducted in a micro‐pyrolysis reactor coupled to a two‐dimensional gas chromatography system. Pyrolysis operating conditions, such as the pyrolysis temperature, the catalyst to feedstock (CF) ratio, and the LDPE:PET ratio, were varied. It was found that for the co‐pyrolysis of LDPE and PET, HZSM‐5 led to higher yields of C2‐C4 olefins and monoaromatic products. Lower CF ratios increased the yield of C2‐C4 olefins for LDPE pyrolysis, but decreased benzene yield for PET pyrolysis, concomitant with an increased yield in benzoic acid. A lower temperature of 400°C which was sufficient for the pyrolysis of LDPE, led to incomplete conversion of PET. Surface response diagrams were used to visualize the impact of the various pyrolysis operating conditions on the yield of C2‐C4 olefins and BTEX, which serve as target products for the circular economy.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0007897

OSTI ID:: 2427066

Journal Information:: AIChE Journal, Journal Name: AIChE Journal; ISSN 0001-1541

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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