Fig. 2: Comparison of catalytic cracking of long-chain alkanes and PE at 300 °C, and affecting factors of PE self-confined cracking.
From: Efficient conversion of polyethylene to light olefins by self-confined cracking and reforming
a Cracking product distribution of reactant with different chain lengths (C18 and C30 represent conventional FCC feedstocks, and C160 and C1000 represent PE). Reaction conditions: 250 mg of commercial ZSM-5 zeolite, 500 mg of reactants, 100% Ar feed gas at a flow rate of 40 mL/min, 300 °C for 2 hours. Error bars represent standard deviation (SD). b Yields of different fractions products of pyrolysis and catalytic cracking of PE (C1000) at different temperatures (300, 400, 500 °C) for 2 h. c Yields of different hydrocarbon fractions vary with C/P ratio from 5 to 0.2 during PE cracking at 300 °C for 2 h. Error bars represent standard deviation (SD). d Adsorption of C3H6 on mixed samples of commercial ZSM-5 and PE with different mass ratios (∞, 2, 1, 0.5, 0) at 200 °C, with 4.48 mmol of C3H6 injected per pulse. Mixtures were hold at 200 °C under Ar flow to ensure complete melt mixing. e Yields of paraffins, olefins, and aromatics after varying times of PE cracking under different C/P of 1 (top) and 0.5 (bottom) at 300 °C. Error bars represent standard deviation (SD). f Schematic of PE self-confined cracking process.
