Catalytic Fast Pyrolysis of Tulip Tree (Liriodendron) for Upgrading Bio-oil in a Bubbling Fluidized Bed Reactor

초록

The bio-oil produced from the fast pyrolysis of lignocellulosic biomass contains a high amount of oxygenates, causingvariation in the properties of bio-oil, such as instability, high acidity, and low heating value, reducing the quality of the bio-oil. Consequently, an upgrading process should be recommended ensuring that these bio-oils are widely used as fuel sources. Catalytic fast pyrolysis has attracted a great deal of attention as a promising method for producing upgraded bio-oil frombiomass feedstock. In this study, the fast pyrolysis of tulip tree was performed in a bubbling fluidized-bed reactor underdifferent reaction temperatures, with and without catalysts, to investigate the effects of pyrolysis temperature and catalysts onproduct yield and bio-oil quality. The system used silica sand, ferric oxides (Fe2O3 and Fe3O4), and H-ZSM-5 as thefluidized-bed material and nitrogen as the fluidizing medium. The liquid yield reached the highest value of 49.96 wt% at 450℃, using Fe2O3 catalyst, compared to 48.45 wt% for H-ZSM-5, 47.57 wt% for Fe3O4 and 49.03 wt% with sand. Catalystsrejected oxygen mostly as water and produced a lower amount of CO and CO2, but a higher amount of H2 and hydrocarbongases. The catalytic fast pyrolysis showed a high ratio of H2/CO than sand as a bed material.

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