Experimental Procedure

1.1 Chemicals and Catalysts

Microporous HZSM-5 (Si/Al = 80), HZSM-5 (Si/Al = 14) and mesoporous SBA-15 and AlSBA-15 catalysts, high-density polyethylene, nitrogen gas, cooling water, hydrochloric acid, N-hexane, triblock copolymer (TCP), tetraethylorthosilicate, and aluminum chloride were the chemicals or reagents, and they were used as received from respective suppliers.

1.2 Preparation of HDPE Sample

The material in pellet form was crushed into powder and then subsequently sieved using a sieving machine to obtain the desired particle size range. Sample of 60-150 mesh size was used in this study.