Investigation of biomass- and polymer-based carbon materials using 13C high-resolution solid-state NMR

被引:81
|
作者
Freitas, JCC [1 ]
Bonagamba, TJ
Emmerich, FG
机构
[1] Univ Fed Espirito Santo, Dept Fis, BR-29060900 Vitoria, ES, Brazil
[2] Ctr Brasileiro Pesquisas Fis, Dept Mat Condensada & Espect, BR-22290180 Rio De Janeiro, Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
char; graphite; carbonization; nuclear magnetic resonance (NMR);
D O I
10.1016/S0008-6223(00)00169-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Carbon materials produced through the thermal decomposition of biomass (rice hulls) and a polymer (polyvinyl chloride) were investigated by C-13 high-resolution solid-state NMR under two different magnetic fields (2.0 and 9.4 T). The details revealed by the high-field NMR spectra provide important information about the chemical changes in the initial stages of pyrolysis: These are shown to be directly related to the original structure of the precursors and the results: complement well some conclusions existent in the literature. From a heat treatment temperature of about 600 degreesC upwards, the general shape of the C-13 NMR spectra, attained with low applied magnetic field, is very similar fur both chars, with a strong resonance line near 125 ppm from TMS (carbon nuclei in aromatic planes). The analysis of the evolution of the main parameters associated with this resonance line shows a behavior typical of heat-treated carbon materials, which is interpreted on the basis of the structural evolution of both chars. We show that the results are well understood when a comparison is made with the features of the C-13 NMR spectrum of polycrystalline graphite. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:535 / 545
页数:11
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