Fig. 5: The potential for practical application of the KDRC strategy.
a, Comparison of ethylene and propylene yield over five cycles of reaction. Reaction conditions: 100 mg of HDPE and 12.5 mg of LSP-Z100 at stage I, 100 mg of P-HZSM-5 at stage II; reaction temperature, 260 °C (stage I), 540 °C (stage II); reaction time, 2 h; N2 flow rate, 10 sccm. The catalyst recycling process is detailed in the Supplementary Information. b, Catalytic conversion of waste polyolefins and resulting yields of ethylene and propylene in a two-stage reactor. Reaction conditions for HDPE and low-density polyethylene (LDPE): 100 mg waste HDPE or LDPE and 12.5 mg LSP-Z100 at stage I, 50 mg each of P-LSP-Z100 and P-HZSM-5 at stage II; reaction temperature, 260 °C (stage I), 540 °C (stage II); reaction time, 2.5 h; N2 flow rate, 10 sccm. *Reaction condition for waste PP: 100 mg PP and 20 mg LSP-Z100 at stage I, 50 mg each of P-LSP-Z100 and P-HZSM-5 at stage II; reaction temperature, 280 °C (stage I), 540 °C (stage II); reaction time, 2 h; N2 flow rate, 10 sccm. c, Comparison of the CO2 emission from the production of 1 metric ton (MT) of ethylene and propylene using PE pyrolysis and KDRC strategy proposed in this work. d, A continuous process that converts PE to ethylene and propylene. Reaction conditions: 12.5 mg LSP-Z100 mixing with quartz sand at stage I, HDPE dosed at a rate of 100 mg h−1; 50 mg each of P-LSP-Z100 and P-HZSM-5 at stage II; reaction temperature, 260 °C (stage I), 540 °C (stage II); reaction time, 8 h; N2 flow rate, 10 sccm. e, The continuous flow reaction system and the quartz tube reactor.
