In situ X-ray diffraction investigation of thermal decomposition of wood cellulose

被引:64
作者
Zickler, Gerald A.
Wagermaier, Wolfgang
Funari, Sergio S.
Burghammer, Manfred
Paris, Oskar
机构
[1] Max Planck Inst Colloids & Intefaces, Dept Biomat, D-14424 Potsdam, Germany
[2] Deutsch Elektronen Synchrotron DESY, HASYLAB, Hamburger Synchrotronstrahlungslabor, D-22603 Hamburg, Germany
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
关键词
wood pyrolysis; cellulose degradation; X-ray diffraction; NEUTRON FIBER DIFFRACTION; HYDROGEN-BONDING SYSTEM; MECHANICAL-PROPERTIES; CRYSTAL-STRUCTURE; ACTIVATED CARBON; NATIVE CELLULOSE; COTTON CELLULOSE; PYROLYSIS; EXPANSION; CERAMICS;
D O I
10.1016/j.jaap.2007.01.011
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The kinetics of thermal decomposition of crystalline cellulose in spruce wood (Picea abies [L.] Karst.) was studied by in situ X-ray diffraction using synchrotron radiation. Fiber diffraction patterns resulting from the crystal lattice of native cellulose arranged in oriented microfibrils were collected as a function of heat treatment time for various temperatures from 300 to 360 degrees C. Sample heating was performed using a specially designed in situ pyrolysis furnace based on halogen lamps with elliptical-shaped reflectors. The variations of the cellulose microfibril size were analyzed by calculating the Scherrer size from equatorial and meridional diffraction peaks. By quantitatively analyzing the kinetics for different temperatures it is found that thermal decomposition of crystalline cellulose in wood occurs mainly via a thermally activated decrease of the fibril diameter and an estimate for the activation energy is obtained. A simple scheme about the structural degradation of cellulose is presented. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:134 / 140
页数:7
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