Pyrolysis of polypropylene over a LZ-Y52 molecular sieve: kinetics and the product distribution

  • Muhammad Anas Khan
  • Jan NisarEmail author
  • Munawar Iqbal
  • Afzal Shah
  • Rafaqat Ali Khan
  • Sirajuddin
  • Ijaz Ahmad Bhatti
  • Roohul Amin
Original Research


The present work demonstrates the decomposition kinetics of polypropylene in the presence of LZ-Y52 molecular sieve. The pyrolysis was performed at different heating rates in the temperature range 30–600 °C in an inert atmosphere. The kinetics parameters were calculated by applying Ozawa–Flynn–Waal, Tang–Wanjun, and Coats–Redfern (modified) methods. The activation energy (Ea) and frequency factor (A) were found in the range of 52.44–74.50 kJ mol−1 and 1.5 × 10−2 to 9.05 × 108 min−1, respectively. Based on the activation energy data, all three methods agreed well. Moreover, pyrolysis was performed at 350–390 °C in a pyrolysis chamber and the conditions were optimized for maximum oil production. A 10% catalyst amount, at 370 °C, nitrogen flow rate 16 mL/min, and reaction time 60 min were the optimum conditions during experimental work. The products collected were analyzed by gas chromatography/mass spectrometry. In the case of thermal degradation, no oil was obtained; however, thermo-catalytic degradation resulted in more than 40% oil at 370 °C for 1 h. Fuel properties of the oil obtained were determined. These properties were in good agreement with standard values and therefore it has potential applications for replacing fuel oil.


Polypropylene Recycling Pyrolysis Kinetics parameters Fuel properties 



The support through Grant No. 20-1491 by Higher Education Commission of Pakistan is highly appreciated.

Compliance with ethical standards

Conflict of interest

There are no conflicts to declare.


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Copyright information

© Iran Polymer and Petrochemical Institute 2019

Authors and Affiliations

  • Muhammad Anas Khan
    • 1
  • Jan Nisar
    • 1
    Email author
  • Munawar Iqbal
    • 2
  • Afzal Shah
    • 3
    • 4
  • Rafaqat Ali Khan
    • 5
  • Sirajuddin
    • 6
  • Ijaz Ahmad Bhatti
    • 7
  • Roohul Amin
    • 8
  1. 1.National Center of Excellence in Physical ChemistryUniversity of PeshawarPeshawarPakistan
  2. 2.Department of ChemistryThe University of LahoreLahorePakistan
  3. 3.Department of Chemistry, College of ScienceUniversity of BahrainSakhirBahrain
  4. 4.Department of ChemistryQuaid-I-Azam UniversityIslamabadPakistan
  5. 5.Department of ChemistryCOMSATS University IslamabadAbbottabadPakistan
  6. 6.HEJ Research Institute of Chemistry, International Center for Chemical and Biological SciencesUniversity of KarachiKarachiPakistan
  7. 7.Department of ChemistryUniversity of AgricultureFaisalabadPakistan
  8. 8.Department of Chemistry, GC PeshawarUniversity of PeshawarPeshawarPakistan

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