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Article

Opening up ZSM-5 Hierarchical Zeolite’s Porosity through Sequential Treatments for Improved Low-Density Polyethylene Cracking

Faculty of Chemistry, Jagiellonian University in Kraków, 2 Gronostajowa St., 30–87 Kraków, Poland
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Author to whom correspondence should be addressed.
Dedicated to Professor Jerzy Datka in appreciation of his outstanding contribution to zeolite science.
Academic Editors: Jerzy Datka, Włodzimierz Mozgawa and Dorota Rutkowska-Zbik
Molecules 2020, 25(12), 2878; https://doi.org/10.3390/molecules25122878
Received: 7 May 2020 / Revised: 11 June 2020 / Accepted: 18 June 2020 / Published: 22 June 2020
(This article belongs to the Special Issue Zeolites and Mesoporous Materials: Properties and Applications)
An adequately tuned acid wash of hierarchical ZSM-5 zeolites offers a levelling up in the catalytic cracking of low-density polyethylene. Identification of crucial and limiting factors governing the activity of the zeolite was extended with studies about the accessibility of acid sites, nature of the realuminated layer and role of Lewis acid sites. The sequential treatment of a ZSM-5 zeolite offered enhanced activity in low-density polyethylene (LDPE) cracking at low and high conversions, as confirmed by a decrease in the temperatures needed to reach 20% and 80% conversion (T20 and T80, respectively). A linear dependence of the T80 on the coupled IHF (indexed hierarchy factor) and AFB (accessibility factor) highlighted the importance of the textural and acidic parameters in the catalytic cracking of LDPE. Operando FT-IR-GC studies confirmed a higher fraction of short-chain hydrocarbons (C3–C5) in the product distribution of hierarchical catalysts resulting from the effective polymer cracking in easily accessible pores. View Full-Text
Keywords: hierarchical zeolites; acid-wash; Lewis acid sites; operando spectroscopy; LDPE cracking; realumination hierarchical zeolites; acid-wash; Lewis acid sites; operando spectroscopy; LDPE cracking; realumination
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MDPI and ACS Style

Tarach, K.A.; Pyra, K.; Góra-Marek, K. Opening up ZSM-5 Hierarchical Zeolite’s Porosity through Sequential Treatments for Improved Low-Density Polyethylene Cracking. Molecules 2020, 25, 2878. https://doi.org/10.3390/molecules25122878

AMA Style

Tarach KA, Pyra K, Góra-Marek K. Opening up ZSM-5 Hierarchical Zeolite’s Porosity through Sequential Treatments for Improved Low-Density Polyethylene Cracking. Molecules. 2020; 25(12):2878. https://doi.org/10.3390/molecules25122878

Chicago/Turabian Style

Tarach, Karolina A., Kamila Pyra, and Kinga Góra-Marek. 2020. "Opening up ZSM-5 Hierarchical Zeolite’s Porosity through Sequential Treatments for Improved Low-Density Polyethylene Cracking" Molecules 25, no. 12: 2878. https://doi.org/10.3390/molecules25122878

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