Effect of desilication of HZSM-5 on the catalytic pyrolysis of polystyrene

Jung Sul Jung, Sumin Pyo, Youna Park, Seulbee Lee, Young Min Kim, Kyung Seun Yoo, Young Kwon Park

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5 Scopus citations

Abstract

Desilicated HZSM-5 (DeHZSM-5) was prepared by the desilication of HZSM-5 (SiO2/Al2O3: 30) and applied to the catalytic pyrolysis of polystyrene (PS) by thermogravimetric analysis (TGA) and pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). TGA showed that HZSM-5 lowered the decomposition temperature and apparent activation energies of PS. DeHZSM-5 led a lower decomposition temperature and Ea values than HZSM-5. The main pyrolyzates of PS, styrene monomer, dimer, and trimer, were converted to smaller aromatic hydrocarbons, such as benzene and toluene. The increased pore size and acidity of DeHZSM-5 formed by the desilication of HZSM-5 led to the efficient diffusion of large molecular pyrolyzates with the increased formation of smaller molecular aromatic hydrocarbons confirming the higher catalytic cracking efficiency.

Original languageEnglish
Article number130107
JournalMaterials Letters
Volume300
DOIs
StatePublished - 1 Oct 2021

Keywords

  • Catalytic pyrolysis
  • Desilicated HZSM-5
  • Kinetic analysis
  • Polystyrene

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