Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts

J. Halász, Z. Kónya, Zsanett T. Faragó, Krisztina Siegert, I. Kiricsi

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

The catalytic degradation of pure and mixed polyolefin polymers such as polyethylene (PE), polypropylene (PP), polystyrene (PS) and poly-(vinylchloride) (PVC) was followed by thermal analytical method (TA) and was performed in a laboratory batch system (LBS) using modified ZSM-5, MCM41 and hydrotalcites based catalysts. In degradation of PE, the acidic H-ZSM-5 resulted in less liquid products and more gaseous components than the other, transition metal containing catalysts. For PP degradation, the non-acidic Ti-MCM41 and the Fe-ZSM-5 samples produced liquid hydrocarbons with yields about 90%. Similar results have been obtained for PS degradation, however, the activity of the catalyst with small pore sizes (ZSM-5) have had lower activity (no reaction observed below 350°C). The degradation of PVC takes place in two steps, the first is the release of HCl at about 300°C followed by formation of aromatic hydrocarbons. Minimal residue could be obtained over Fe,Mg,Al- and Ca,MgAl-mixed oxide catalyst. From the results obtained it can be concluded that not only the catalyst structure but also the polymer structure determines the activity of a micro- or mesoporous material in the catalytic degradation of plastics or plastic wastes. Therefore, different optimal conditions (catalyst and reaction temperature) can be applied for each plastics studied (pure, mixed and waste) in thermal treatment.

Original languageEnglish
Title of host publicationStudies in Surface Science and Catalysis
Pages1021-1026
Number of pages6
Volume174
EditionB
DOIs
Publication statusPublished - 2008

Publication series

NameStudies in Surface Science and Catalysis
NumberB
Volume174
ISSN (Print)01672991

Fingerprint

Polyolefins
degradation
catalysts
Degradation
Catalysts
hydrotalcite
plastics
Polypropylenes
Polystyrenes
Polyethylene
Plastics
polypropylene
Polyethylenes
polyethylenes
polystyrene
Polymers
hydrocarbons
Microporous materials
Aromatic Hydrocarbons
Mesoporous materials

Keywords

  • catalytic degradation
  • hydrotalcites
  • polyolefins
  • PVC
  • zeolite

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Catalysis
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Halász, J., Kónya, Z., Faragó, Z. T., Siegert, K., & Kiricsi, I. (2008). Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts. In Studies in Surface Science and Catalysis (B ed., Vol. 174, pp. 1021-1026). (Studies in Surface Science and Catalysis; Vol. 174, No. B). https://doi.org/10.1016/S0167-2991(08)80063-8

Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts. / Halász, J.; Kónya, Z.; Faragó, Zsanett T.; Siegert, Krisztina; Kiricsi, I.

Studies in Surface Science and Catalysis. Vol. 174 B. ed. 2008. p. 1021-1026 (Studies in Surface Science and Catalysis; Vol. 174, No. B).

Research output: Chapter in Book/Report/Conference proceedingChapter

Halász, J, Kónya, Z, Faragó, ZT, Siegert, K & Kiricsi, I 2008, Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts. in Studies in Surface Science and Catalysis. B edn, vol. 174, Studies in Surface Science and Catalysis, no. B, vol. 174, pp. 1021-1026. https://doi.org/10.1016/S0167-2991(08)80063-8
Halász J, Kónya Z, Faragó ZT, Siegert K, Kiricsi I. Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts. In Studies in Surface Science and Catalysis. B ed. Vol. 174. 2008. p. 1021-1026. (Studies in Surface Science and Catalysis; B). https://doi.org/10.1016/S0167-2991(08)80063-8
Halász, J. ; Kónya, Z. ; Faragó, Zsanett T. ; Siegert, Krisztina ; Kiricsi, I. / Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts. Studies in Surface Science and Catalysis. Vol. 174 B. ed. 2008. pp. 1021-1026 (Studies in Surface Science and Catalysis; B).
@inbook{8556579c7830471d9bc383cf5a376382,
title = "Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts",
abstract = "The catalytic degradation of pure and mixed polyolefin polymers such as polyethylene (PE), polypropylene (PP), polystyrene (PS) and poly-(vinylchloride) (PVC) was followed by thermal analytical method (TA) and was performed in a laboratory batch system (LBS) using modified ZSM-5, MCM41 and hydrotalcites based catalysts. In degradation of PE, the acidic H-ZSM-5 resulted in less liquid products and more gaseous components than the other, transition metal containing catalysts. For PP degradation, the non-acidic Ti-MCM41 and the Fe-ZSM-5 samples produced liquid hydrocarbons with yields about 90{\%}. Similar results have been obtained for PS degradation, however, the activity of the catalyst with small pore sizes (ZSM-5) have had lower activity (no reaction observed below 350°C). The degradation of PVC takes place in two steps, the first is the release of HCl at about 300°C followed by formation of aromatic hydrocarbons. Minimal residue could be obtained over Fe,Mg,Al- and Ca,MgAl-mixed oxide catalyst. From the results obtained it can be concluded that not only the catalyst structure but also the polymer structure determines the activity of a micro- or mesoporous material in the catalytic degradation of plastics or plastic wastes. Therefore, different optimal conditions (catalyst and reaction temperature) can be applied for each plastics studied (pure, mixed and waste) in thermal treatment.",
keywords = "catalytic degradation, hydrotalcites, polyolefins, PVC, zeolite",
author = "J. Hal{\'a}sz and Z. K{\'o}nya and Farag{\'o}, {Zsanett T.} and Krisztina Siegert and I. Kiricsi",
year = "2008",
doi = "10.1016/S0167-2991(08)80063-8",
language = "English",
isbn = "9780444532985",
volume = "174",
series = "Studies in Surface Science and Catalysis",
number = "B",
pages = "1021--1026",
booktitle = "Studies in Surface Science and Catalysis",
edition = "B",

}

TY - CHAP

T1 - Degradation of pure and waste polyolefins and PVC in the presence of modified porous catalysts

AU - Halász, J.

AU - Kónya, Z.

AU - Faragó, Zsanett T.

AU - Siegert, Krisztina

AU - Kiricsi, I.

PY - 2008

Y1 - 2008

N2 - The catalytic degradation of pure and mixed polyolefin polymers such as polyethylene (PE), polypropylene (PP), polystyrene (PS) and poly-(vinylchloride) (PVC) was followed by thermal analytical method (TA) and was performed in a laboratory batch system (LBS) using modified ZSM-5, MCM41 and hydrotalcites based catalysts. In degradation of PE, the acidic H-ZSM-5 resulted in less liquid products and more gaseous components than the other, transition metal containing catalysts. For PP degradation, the non-acidic Ti-MCM41 and the Fe-ZSM-5 samples produced liquid hydrocarbons with yields about 90%. Similar results have been obtained for PS degradation, however, the activity of the catalyst with small pore sizes (ZSM-5) have had lower activity (no reaction observed below 350°C). The degradation of PVC takes place in two steps, the first is the release of HCl at about 300°C followed by formation of aromatic hydrocarbons. Minimal residue could be obtained over Fe,Mg,Al- and Ca,MgAl-mixed oxide catalyst. From the results obtained it can be concluded that not only the catalyst structure but also the polymer structure determines the activity of a micro- or mesoporous material in the catalytic degradation of plastics or plastic wastes. Therefore, different optimal conditions (catalyst and reaction temperature) can be applied for each plastics studied (pure, mixed and waste) in thermal treatment.

AB - The catalytic degradation of pure and mixed polyolefin polymers such as polyethylene (PE), polypropylene (PP), polystyrene (PS) and poly-(vinylchloride) (PVC) was followed by thermal analytical method (TA) and was performed in a laboratory batch system (LBS) using modified ZSM-5, MCM41 and hydrotalcites based catalysts. In degradation of PE, the acidic H-ZSM-5 resulted in less liquid products and more gaseous components than the other, transition metal containing catalysts. For PP degradation, the non-acidic Ti-MCM41 and the Fe-ZSM-5 samples produced liquid hydrocarbons with yields about 90%. Similar results have been obtained for PS degradation, however, the activity of the catalyst with small pore sizes (ZSM-5) have had lower activity (no reaction observed below 350°C). The degradation of PVC takes place in two steps, the first is the release of HCl at about 300°C followed by formation of aromatic hydrocarbons. Minimal residue could be obtained over Fe,Mg,Al- and Ca,MgAl-mixed oxide catalyst. From the results obtained it can be concluded that not only the catalyst structure but also the polymer structure determines the activity of a micro- or mesoporous material in the catalytic degradation of plastics or plastic wastes. Therefore, different optimal conditions (catalyst and reaction temperature) can be applied for each plastics studied (pure, mixed and waste) in thermal treatment.

KW - catalytic degradation

KW - hydrotalcites

KW - polyolefins

KW - PVC

KW - zeolite

UR - http://www.scopus.com/inward/record.url?scp=55149111420&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=55149111420&partnerID=8YFLogxK

U2 - 10.1016/S0167-2991(08)80063-8

DO - 10.1016/S0167-2991(08)80063-8

M3 - Chapter

AN - SCOPUS:55149111420

SN - 9780444532985

VL - 174

T3 - Studies in Surface Science and Catalysis

SP - 1021

EP - 1026

BT - Studies in Surface Science and Catalysis

ER -