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Title: Catalytic degradation of high-density polyethylene over different zeolitic structures

Abstract

The catalytic degradation of high-density polyethylene to hydrocarbons was studied over different zeolites. The product range was typically between C{sub 3} and C{sub 15} hydrocarbons. Distinctive patterns of product distribution were found with different zeolitic structures. Over large-pore ultrastable Y, Y, and {beta} zeolites, alkanes were the main products with less alkenes and aromatics and only very small amounts of cycloalkanes and cycloalkenes. Medium-pore mordenite and ZSM-5 gave significantly more olefins. In the medium-pore zeolites secondary bimolecular reactions were sterically hindered, resulting in higher amounts of alkenes as primary products. The hydrocarbons formed with medium-pore zeolites were lighter than those formed with large-pore zeolites. The following order was found regarding the carbon number distribution: (lighter products) ZSM-5 < mordenite < {beta} < Y < US-Y (heavier products). A similar order was found regarding the bond saturation: (more alkenes) ZSM-5 < mordenite < {beta} < Y < US-Y (more alkanes). Dependent upon the chosen zeolite, a variety of products was obtained with high values as fuel, confirming catalytic degradation of polymers as a promising method of waste plastic recycling.

Authors:
; ;
Publication Date:
Research Org.:
Univ. Coll. London (GB)
OSTI Identifier:
20076071
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; POLYETHYLENES; DECOMPOSITION; ZEOLITES; CATALYTIC EFFECTS; ALKANES; ALKENES; AROMATICS; CHEMICAL REACTION YIELD; MUNICIPAL WASTES; INDUSTRIAL WASTES; RECYCLING

Citation Formats

Manos, G., Garforth, A., and Dwyer, J. Catalytic degradation of high-density polyethylene over different zeolitic structures. United States: N. p., 2000. Web. doi:10.1021/ie990512q.
Manos, G., Garforth, A., & Dwyer, J. Catalytic degradation of high-density polyethylene over different zeolitic structures. United States. doi:10.1021/ie990512q.
Manos, G., Garforth, A., and Dwyer, J. Mon . "Catalytic degradation of high-density polyethylene over different zeolitic structures". United States. doi:10.1021/ie990512q.
@article{osti_20076071,
title = {Catalytic degradation of high-density polyethylene over different zeolitic structures},
author = {Manos, G. and Garforth, A. and Dwyer, J.},
abstractNote = {The catalytic degradation of high-density polyethylene to hydrocarbons was studied over different zeolites. The product range was typically between C{sub 3} and C{sub 15} hydrocarbons. Distinctive patterns of product distribution were found with different zeolitic structures. Over large-pore ultrastable Y, Y, and {beta} zeolites, alkanes were the main products with less alkenes and aromatics and only very small amounts of cycloalkanes and cycloalkenes. Medium-pore mordenite and ZSM-5 gave significantly more olefins. In the medium-pore zeolites secondary bimolecular reactions were sterically hindered, resulting in higher amounts of alkenes as primary products. The hydrocarbons formed with medium-pore zeolites were lighter than those formed with large-pore zeolites. The following order was found regarding the carbon number distribution: (lighter products) ZSM-5 < mordenite < {beta} < Y < US-Y (heavier products). A similar order was found regarding the bond saturation: (more alkenes) ZSM-5 < mordenite < {beta} < Y < US-Y (more alkanes). Dependent upon the chosen zeolite, a variety of products was obtained with high values as fuel, confirming catalytic degradation of polymers as a promising method of waste plastic recycling.},
doi = {10.1021/ie990512q},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}