Abstract:
This research aims to study the effect of aluminum (Al) leaching pre-treatment on the catalytic pyrolysis of metallised
food packaging plastics waste (MFPW). The experiments started with removal of Al from MFPW using leaching process
to prepare Al-free mixed plastic waste (MPW). The catalytic pyrolysis of MPW over ZSM-5 zeolite catalyst was carried
out using thermogravimetric (TG) analysis coupled with FTIR, while GC–MS was used to observe the compounds of the
volatile products. The catalytic pyrolysis kinetic behaviour of MPW was studied using the linear and nonlinear
isoconversional approaches. The elemental and proximate results showed that MPW is very rich in carbon elements
(79 %) and volatile content (99 %). The TG results showed that MPW and ZSM/MPW were fully decomposed in the
range of 376–496 °C without any presence of char. Based on TG-FTIR analysis, methane and carboxylic acid residue
were the main groups of the synthesized volatile products, whereas nitrous oxide, 1-Butanol, 1-Propene, acetic acid,
and formic acid were the major GC compounds. In case of ZSM/MPW, carbon dioxide and acetic acid were the
major GC compounds at 5–25 °C/min, triphenylphosphine oxide and Phosphine oxide at 30 °C/min. The kinetic
analysis showed that when the activation energies are located in the range 287–297 kJ/mol (MPW) and
153–187 kJ/mol (ZSM/MPW) and KAS, Vyazovkin, and Cai methods are the most suitable models to study pyrolysis
kinetic of MPW with R2 > 89. Based on that, leaching and catalytic pyrolysis processes are a highly suggested technol-
ogy that can be used to convert MFPW into high-added energy and chemical products.
