화학공학소재연구정보센터
Applied Energy, Vol.183, 542-551, 2016
Formation of aromatic ring structures during the thermal treatment of mallee wood cylinders at low temperature
Aromatics are important components in the tars from biomass gasification or in bio-oil from pyrolysis. This study investigated the formation of polycyclic aromatics during the thermal treatment of mallee wood at low temperature. The formation of tar was negligible below 200 degrees C but became significant above 230 degrees C. At the same time, the abundance of aromatics also became significant above 230 degrees C. In addition, it was found that some aromatics were formed even at temperatures as low as 150 degrees C. These aromatics were trapped in the resultant chars but could be extracted with solvents (i.e. methanol/chloroform). The abundance of trapped aromatics was different between the outer surface and the centre of the char (cylinder shape). FT-IR and UV-fluorescence analysis revealed that the aromatics contained polar functionalities (e.g. carbonyl groups) on the benzene rings. Some unsaturated hydroxyl aldehyde/ketone intermediates were formed in parallel with the aromatics. (C) 2016 Elsevier Ltd. All rights reserved.