Catalytic co-pyrolysis of LDPE and PET with HZSM-5, H-beta, and HY: experiments and kinetic modelling

Okonsky, Sean Timothy; Krishna, J. V. Jayarama; Toraman, Hilal Ezgi

doi:10.1039/d2re00144f

Title: Catalytic co-pyrolysis of LDPE and PET with HZSM-5, H-beta, and HY: experiments and kinetic modelling

Journal Article · Thu Jun 30 00:00:00 EDT 2022 · Reaction Chemistry & Engineering

DOI:https://doi.org/10.1039/d2re00144f· OSTI ID:1978907

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Pennsylvania State Univ., University Park, PA (United States)

In this study, the catalytic pyrolysis of low-density polyethylene (LDPE), polyethylene terephthalate (PET) and their mixture (1 : 1 wt/wt) with three zeolite catalysts (HZSM-5, H-beta, HY) was investigated using a thermogravimetric analyzer (TGA) and a Pyroprobe® micro-reactor coupled to a gas chromatograph mass spectrometer (Py-GC/MS). The TGA results demonstrated that during pyrolysis at 10 °C min^–1, on average, zeolite catalysts decreased the maximum decomposition temperature by 149 °C for LDPE while only decreasing by 8 °C for PET. The derivative thermogravimetric (DTG) curve evidenced interactions when the two polymers were catalytically co-pyrolyzed for all the three catalysts. A lumped nth order reaction scheme was able to accurately model both non-catalytic and catalytic pyrolysis and co-pyrolysis by using the least squares fitting approach for determining the kinetic parameters. The kinetic model was able to model well the interaction effects observed during catalytic co-pyrolysis of LDPE and PET with HZSM-5, H-beta, and HY (Fit%_Wt% > 96%, Fit%_DTG > 94%). Py-GC/MS experiments for the catalytic fast pyrolysis of LDPE revealed that HZSM-5 resulted in the highest selectivity to aromatic hydrocarbons (31.6%) and HY resulted in the highest selectivity to gasoline range C₅–C₁₀ paraffins and olefins (40.9%). Catalytic fast pyrolysis of PET showed high selectivity to benzene for all the catalysts (>43%) and that HZSM-5 resulted in the highest selectivity to polyaromatic hydrocarbons (24.7%). Finally, the catalytic fast co-pyrolysis of LDPE and PET revealed interaction effects for all the three catalysts evidenced by a positive synergy% for alkylated benzenes (3–142%) and polyaromatics (105–187%) with a concomitant negative synergy% for benzene (24–36%) and C₅–C₁₀ paraffins and olefins (27–53%).

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Research Organization:: Sustainable Manufacturing Innovation Alliance Corp., West Henrietta, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007897

OSTI ID:: 1978907

Alternate ID(s):: OSTI ID: 1875713

Journal Information:: Reaction Chemistry & Engineering, Vol. 7, Issue 10; ISSN 2058-9883

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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