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Catalytic transformation of the gases evolved during the thermal decomposition of HDPE using acid-activated and pillared clays

Content Provider	Royal Society of Chemistry (RSC)
Author	Last, Philip M. Breen, Christopher
Copyright Year	1999
Abstract	HDPE was thermally decomposed in a thermobalance and the evolved gases were passed through a bed of catalyst. Two acid activated clays of different structure were used, i.e. sepiolite (SEP), which is a fibrous clay mineral, and smectite (K10) which is a layered mineral. In addition two pillared smectites were studied one which was pillared with an Al species (AZA) and the other with an Al/Fe-species (FAZA). The thermal and catalytic decomposition of HDPE was studied under dynamic (35 to 650 °C at 10 °C min –1 ) and isothermal (60 min at 420 °C) conditions. The evolved gases were analysed using TG-OTM-GC-MS. The thermal decomposition of HDPE yielded characteristic quartets of peaks assigned to n-alkanes, alk-1-enes, alk-x-enes and α,ω-dienes in the range C 4 -C 20 . Species of higher molecular weight than C 20 were not detected. All four catalysts converted the alkenes present in the thermally generated off gases into light gases and aromatic species including respectable quantities of toluene, xylenes, tri- and tetra-methylbenzenes. Ethylbenzenes and naphthalenes were produced to a lesser extent. AZA and FAZA produced the largest yield of aromatics and sepiolite is considered to produce significant quantities of low molecular weight gases in the isothermal process. The product distribution over sepiolite suggested that there were fewer dehydrocyclisation sites on this catalyst. None of the catalysts used was capable of cracking the saturated alkanes.
Starting Page	813
Ending Page	818
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	9
Issue Number	3
Journal	Journal of Materials Chemistry
DOI	10.1039/a808882i
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	HDPE FAZA Polyethylene Acid Sepiolite Clay minerals Mineral Association of Zoos and Aquariums Mir Isothermal process Alkane Anaplastic lymphoma kinase Exames Nacionais do Ensino Secundário Toluene
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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