Efficient Pyrolysis of Low-Density Polyethylene for Regulatable Oil and Gas Products by ZSM-5, HY and MCM-41 Catalysts

In this research, catalytic cracking of low-density polyethylene (LDPE) has been carried out in the presence three kinds typical molecular sieves, including ZSM-5, HY and MCM-41, respectively. The effects different catalysts on composition quantity pyrolysis products consisting gas, oil solid material were systematically investigated summarized. Specially, added into LDPE for to obtain regulatable gas (H2, CH4 a mixture C2–C4+ gaseous hydrocarbons). These characterized with BET, NH3-TPD, SEM TEM. results show that addition MCM-41 improved yield, indicating secondary intermediate species primary decreased case catalyst. highest selectivity liquid (78.4% at 650 °C) may be attributed its moderate total acidity relatively high BET surface area. ZSM-5 found produce great amount (61.4% 67.1% °C). particular, aromatic yield production reached maximum (65.9% 500 when was used. Accordingly, catalysts, new environment-friendly efficient recovery approach developed valuable by LDPE-type plastic wastes.