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Processes forming Gas, Tar, and Coke in Cellulose Gasification from Gas‐Phase Reactions of Levoglucosan as Intermediate
Author(s) -
Fukutome Asuka,
Kawamoto Haruo,
Saka Shiro
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500275
Subject(s) - levoglucosan , coke , chemistry , pyrolysis , tar (computing) , cellulose , organic chemistry , gas phase , chemical engineering , aerosol , computer science , biomass burning , engineering , programming language
The gas‐phase pyrolysis of levoglucosan (LG), the major intermediate species during cellulose gasification, was studied experimentally over the temperature range of 400–900 °C. Gaseous LG did not produce any dehydration products, which include coke, furans, and aromatic substances, although these are characteristic products of the pyrolysis of molten LG. Alternatively, at >500 °C, gaseous LG produced only fragmentation products, such as noncondensable gases and condensable C 1 –C 3 fragments, as intermediates during noncondensable gas formation. Therefore, it was determined that secondary reactions of gaseous LG can result in the clean (tar‐ and coke‐free) gasification of cellulose. Cooling of the remaining LG in the gas phase caused coke formation by the transition of the LG to the molten state. The molecular mechanisms that govern the gas‐ and molten‐phase reactions of LG are discussed in terms of the acid catalyst effect of intermolecular hydrogen bonding to promote the molten‐phase dehydration reactions.