Tandem μ-reactor-GC/MS for online monitoring of aromatic hydrocarbon production: Via CaO-catalysed PET pyrolysis

S. Kumagai, R. Yamasaki, T. Kameda, Y. Saito, A. Watanabe, C. Watanabe, N. Teramae, T. Yoshioka

研究成果: Article査読

19 被引用数 (Scopus)

抄録

The present work demonstrates the online monitoring of aromatic hydrocarbon production via two-step CaO catalysed pyrolysis of poly(ethylene terephthalate) (PET), employing tandem μ-reactor-gas chromatography/mass spectrometry (TR-GC/MS). PET produces high-boiling terephthalic acid (TPA) during pyrolysis, which hinders the online monitoring of PET pyrolysis. In this work, TR allowed for independent control of the PET pyrolysis and CaO catalytic reaction with a very small sample loading (<1 mg) and split injection into the GC/MS (split ratio 100:1) system; thus, fatal line clogging by TPA could be avoided. Thus, we successfully demonstrated the effect of CaO basicity on the time- and temperature-dependent dynamic production of aromatic hydrocarbons. Strongly basic CaO accelerated the decarboxylation of PET pyrolysates to afford useful aromatic hydrocarbons such as benzene, toluene, and styrene with 99.7% selectivity in the oil. In contrast, weakly basic CaO enhanced benzophenone production in preference to benzene formation. The poor deoxygenation ability of the weakly basic CaO increased the concentration of oxygen-containing compounds in the oil. Finally, the time- and temperature-dependent dynamic pathways and the mechanism involving strongly basic/weakly basic CaO were established. These findings allow for a clearer understanding of the nature of PET catalytic pyrolysis, which will be helpful for advancing PET recycling. Furthermore, the novel methodology - online monitoring of a two-step pyrolysis-catalytic upgrading process involving high-boiling compounds - will gain the highest demand in the fields of green chemistry and reaction engineering.

本文言語English
ページ(範囲)776-784
ページ数9
ジャーナルReaction Chemistry and Engineering
2
5
DOI
出版ステータスPublished - 2017 10

ASJC Scopus subject areas

  • 触媒
  • 化学(その他)
  • 化学工学(その他)
  • プロセス化学およびプロセス工学
  • 流体および伝熱

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