2. Materials and methods
2.1. Materials
The feedstocks used for these experiments were three kinds of municipal plastic wastes, i.e. polyethylene bag
with (PE bag 2) and without (PE bag 1) crushing and washing, and high density polyethylene (HDPE) waste after
crushing and washing. They were obtained from the final disposal site and the small plastic recycling company in
Yogyakarta city, Indonesia. The appearance of the feedstocks are shown in Fig. 1. The catalysts used for these
works were commercial Y zeolite and natural zeolite.
The Y zeolite (CBV 780 CY) was obtained from Zeolyst International. It has SiO2/Al2O3 mole ratio of 80, the
unit cell size of 24.24