Evidence of char formation during wood heat treatment by mild pyrolysis

被引：74

作者：

Inari, Gildas Nguila ^{[1
]}

Mounguengui, Steeve ^{[1
]}

Dumarcay, Stephane ^{[1
]}

Petrissans, Mathieu ^{[1
]}

Gerardin, Philippe ^{[1
]}

机构：

[1] Univ Nancy 1, Fac Sci & Technol, UMR A1093, Lab Etud Rech Mat Bois, F-54506 Vandoeuvre Les Nancy, France

来源：

POLYMER DEGRADATION AND STABILITY | 2007年 / 92卷 / 06期

关键词：

char; C-13; NMR; heat treatment; holocellulose; lignin; wood;

D O I：

10.1016/j.polymdegradstab.2007.03.003

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The behaviour of wood polymers during heat treatment carried out under inert atmosphere at 240 degrees C has been reinvestigated to understand the important decrease of the O/C ratio observed in a previous study using X-ray photoelectron spectroscopy (XPS). Heat treatment was performed not only on beech sawdust but also on its lignin and holocellulose fractions obtained after acidic hydrolysis of polysaccharides or delignification with sodium chlorite. CP/MAS C-13 NMR spectra indicate as previously reported an important degradation of hemicelluloses after thermal treatment. However, assignments of the signals appearing in the range of 125-135 ppm and 35 ppm attributed up to now to thermal crosslinking of lignin and formation of methylene bridges should be reconsidered. Indeed, heat treatment of the holocellulose fraction indicates quite similar signals showing that these latter are not due to lignin modification. According to the literature, these new signals have been attributed to the beginning of char formation. Determination of Klason lignin and HPLC analysis of the sugars contained in the hydrolysate support the hypothesis of formation of carbonaceous materials within the wood structure during heat treatment by mild pyrolysis. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：997 / 1002

页数：6

共 19 条

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