Abstract
In pyrolysis, the formed biochar is not an inert material as it could interact with of varied volatiles via distinct ways, modifying the composition of bio-oil and its own property. In this study, the pyrolysis of biomass with the biochar of the exactly same origin was conducted at 500 ºC with cellulose, lignin and poplar sawdust as the research objects, aiming to probe the potential involvement of biochar in pyrolysis. It has been demonstrated that, independent of feedstock, the presence of biochar decreased yields of newly formed biochar (41.0 % decrease for cellulose while 22.3 % for sawdust) via suppressing secondary condensation of volatiles. However, the biochar catalyst aided to form more bio-oil and gas via catalyzing the secondary cracking reactions such as decarboxylation and dehydrogenation reactions. In addition, during the volatile-char interaction, deposition of oxygen-containing species on surface of biochar was observed, which influenced the thermal stability, hydrophilicity, the crystallinity and regularity of the spatial arrangement of carbon crystals of the resulting biochar. The results from in-situ characterization showed that the biochar catalyst interfered with the dehydrogenation of the C-H, the dehydration of -OH and formation of the reaction intermediates with CO.
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