Journal
BIOMASS & BIOENERGY
Volume 30, Issue 10, Pages 855-862Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2006.04.005
Keywords
char; moisture content; relaxation; southern hardwoods; time domain-nuclear magnetic resonance
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Chars from the thermal degradation of silver maple (Acer saccharinum), red maple (Acer rubrum), sugar maple (Acer saccharum), and white oak (Quercus spp.), performed at temperatures from 250 to 350 degrees C, were examined using time domain-nuclear magnetic resonance spectroscopy. Prior to analysis, the chars were equilibrated under conditions insuring the presence of bound water only and both bound water and free water. Transverse relaxation times were found to be related to the moisture content of the chars, which varied with temperature. At elevated temperatures the number of signals assigned to free water decreased, indicative of an increase in pore size within the chars. (c) 2006 Elsevier Ltd. All rights reserved.
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