The
dielectric barrier discharge (DBD) plasma synergistic catalytic
pyrolysis scheme was developed for upgrading polyethylene (PE) pyrolysis
volatiles to obtain aromatics-enriched oil. The effects of the PE/HZSM-5
ratio, discharge power, and discharge time interval on the product
yield, oil composition, and carbon deposition were studied by the
experiment. When the PE/HZSM-5 ratio shifted from 5:1 to 1:5, the
oil yield decreased first and then ramped to 51.32%. The selectivity
for aromatics in oil increased from 69.93 to 98.43%. In the discharge
power range of 0–15 W, increasing the power increased the aromatic
content with the maximum of 98.14%, consequently decreasing the alkane
and alkene contents of the product oils. The further addition of the
power resulted in a small decrease in the selectivity for the aromatics.
The coke showed a decrease in yield with increasing discharge power
when the power did not exceed 20 W. The maximum selectivities for
aromatics (97.69%) and the minimum coke yield (2.82%) were obtained
at the discharge time intervals of 2.5 and 5 ms, respectively. In
general, both of the free radicals excited by the plasma and the specific
surface area, acidity, and strength of HZSM-5 changed by the plasma
favored the aromatization reaction.
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