TunableProduction of Jet-Fuel Range Alkanes and Aromatics by Catalytic Pyrolysis ofLDPE over Biomass-Derived Activated Carbons
KunWan, Huan Chen, Fangjuan Zheng, Yankai Pan, Yayun Zhang*, and Donghui Long*
Industrial & Engineering Chemistry Research, 2020.
文章链接：https://pubs.acs.org/doi/abs/10.1021/acs.iecr.0c02482
Turning waste plastics (WPs) into valuablefuels and chemicals by catalytic pyrolysis is a promising strategy foralleviating fast fossil oil consumption and white pollution, where activatedcarbon (AC) is an emerging efficient catalyst but is not yet well studied.Herein, the corncob-derived ACs were prepared differently and used to conductcatalytic pyrolysis of low-density polyethylene (LDPE) to obtain value-addedjet fuels. The porosity and acidity of ACs obtained varied under differentfabrication conditions. The maximum specific surface area and the acidity couldreach up to 1454.73 m2/g and 0.44 mmol/g,respectively. The highest liquid yield was 75.3 wt % with 93.13 area % of jetfuel-ranged hydrocarbons by using the AC that was carbonized at 500 °C andphosphoric acid to corncob ratio of 0.8. In addition, the highest contents ofalkanes and aromatics in liquid oil were 48.21 and 59.21 area % by using ACprepared at 400 and 600 °C with phosphoric acid to corncob ratio of 0.8,respectively. Results unveil the AC with strong acidity is beneficial to thegeneration of aromatics, while AC with weak acidity is favorable to thegeneration of alkanes. Besides, increasing the catalytic temperature and AC toLDPE ratio are contributed to converting alkanes into aromatics. Therefore,tunable production of jet-fuel range alkanes and aromatics can be achieved byusing different ACs of various acidity and reaction temperatures. The resultsalso present a superior yield of liquid oil obtained with AC catalysts toconditional zeolite catalysts, indicating potentially promising practicalapplication. The present work may provide more information for guiding ACs usedefficiently in catalytic pyrolysis of WPs into value-added jet fuels.
