热解
聚乙烯
脱氢
铜
金属
化学
热分解
无机化学
分解
有机化学
化学工程
催化作用
工程类
作者
Lei Ji,Antoine Hervier,Michel Sablier
出处
期刊:Chemosphere
[Elsevier]
日期:2006-11-01
卷期号:65 (7): 1120-1130
被引量:21
标识
DOI:10.1016/j.chemosphere.2006.04.029
摘要
Pyrolysis experiments were conducted to elucidate the effects of metal chlorides on the thermal degradation of low-density polyethylene on a continuous pyrolysis temperature range of 600 °C to 1100 °C. The present work focusses on the ratio of aromatics generated on increasing the pyrolysis temperature in the presence of metal salts, iron(II), iron(III) and copper(II) chlorides. It was observed that beside α,ω-dienes, α-olefins and n-alkanes which are usually observed during the thermal decomposition of polyethylene, the level of aromatics noticeably increases with the addition of metal salts. At high temperatures, the formation of these aromatics took place in such a way that they become the major products when polyethylene is pyrolyzed in presence of FeCl3 and CuCl2. Quantification of the effect of metal salts has been tempted comparing the variation of the ratio of aromatics with pyrolysis temperatures. Mechanisms responsible for the formation of these aromatics in presence of metal salts have been tentatively investigated. They are proposed to result from cyclization/dehydrogenation reactions similar to those observed during the thermal decomposition of polyethylene, but with an increased efficiency due to the metal salts.
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