Tuning High-Density Polyethylene Hydrocracking through Mordenite Zeolite Crystal Engineering

Pavel A. Kots; Panagiota A. Doika; Brandon C. Vance; Sean Najmi; Dionisios G. Vlachos

doi:10.1021/acssuschemeng.3c01515

Tuning High-Density Polyethylene Hydrocracking through Mordenite Zeolite Crystal Engineering

Pavel A. Kots, Panagiota A. Doika, Brandon C. Vance, Sean Najmi, Dionisios G. Vlachos

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate the hydrocracking of high-density polyethylene using a bifunctional Pt/Al₂O₃ and modified mordenite acid catalyst. Mass transport limitations impact polymer diffusion into the mordenite pore complex. Initial reaction intermediates are formed on the zeolite’s outer surface. Intercrystallite open-end mesopores improve the diffusion of reaction intermediates deeper into the crystal. Recrystallization and desilication of mordenite lead to a higher polymer conversion and shift the product distribution maximum from pentanes to hexanes and heptanes. The nature of mesopores (occluded or open) and total Brønsted acidity significantly impact zeolite activity and selectivity.

Original language	English (US)
Pages (from-to)	9000-9009
Number of pages	10
Journal	ACS Sustainable Chemistry and Engineering
Volume	11
Issue number	24
DOIs	https://doi.org/10.1021/acssuschemeng.3c01515
State	Published - Jun 19 2023

Keywords

circularity
diffusion limitations
mesoporosity
plastic waste

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry
General Chemical Engineering
Renewable Energy, Sustainability and the Environment

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10.1021/acssuschemeng.3c01515

Cite this

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title = "Tuning High-Density Polyethylene Hydrocracking through Mordenite Zeolite Crystal Engineering",

abstract = "We investigate the hydrocracking of high-density polyethylene using a bifunctional Pt/Al2O3 and modified mordenite acid catalyst. Mass transport limitations impact polymer diffusion into the mordenite pore complex. Initial reaction intermediates are formed on the zeolite{\textquoteright}s outer surface. Intercrystallite open-end mesopores improve the diffusion of reaction intermediates deeper into the crystal. Recrystallization and desilication of mordenite lead to a higher polymer conversion and shift the product distribution maximum from pentanes to hexanes and heptanes. The nature of mesopores (occluded or open) and total Br{\o}nsted acidity significantly impact zeolite activity and selectivity.",

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author = "Kots, {Pavel A.} and Doika, {Panagiota A.} and Vance, {Brandon C.} and Sean Najmi and Vlachos, {Dionisios G.}",

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AU - Doika, Panagiota A.

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AU - Najmi, Sean

AU - Vlachos, Dionisios G.

PY - 2023/6/19

Y1 - 2023/6/19

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AB - We investigate the hydrocracking of high-density polyethylene using a bifunctional Pt/Al2O3 and modified mordenite acid catalyst. Mass transport limitations impact polymer diffusion into the mordenite pore complex. Initial reaction intermediates are formed on the zeolite’s outer surface. Intercrystallite open-end mesopores improve the diffusion of reaction intermediates deeper into the crystal. Recrystallization and desilication of mordenite lead to a higher polymer conversion and shift the product distribution maximum from pentanes to hexanes and heptanes. The nature of mesopores (occluded or open) and total Brønsted acidity significantly impact zeolite activity and selectivity.

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KW - mesoporosity

KW - plastic waste

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Tuning High-Density Polyethylene Hydrocracking through Mordenite Zeolite Crystal Engineering

Abstract

Keywords

ASJC Scopus subject areas

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