Specific molecular structure changes and radical evolution during biomass-polyethylene terephthalate co-pyrolysis detected by 13C and 1H solid-state NMR

被引：29

作者：

Ko, Kwang-Hyun ^{[1
]}

Sahajwalla, Veena ^{[1
]}

Rawal, Aditya ^{[2
]}

机构：

[1] Univ New S Wales, Sch Mat Sci & Engn, Ctr Sustainable Mat Res & Technol SMaRT, Sydney, NSW 2052, Australia

[2] Univ New S Wales, Mark Wainwright Analyt Ctr, Nucl Magnet Resonance Facil, Sydney, NSW 2052, Australia

来源：

BIORESOURCE TECHNOLOGY | 2014年 / 170卷

关键词：

Co-pyrolysis; Cross-linking reaction; Radical; C-13; NMR; H-1; MACADAMIA NUT SHELL; THERMAL-DEGRADATION; CARBON; RELAXATION; CHARS; OIL;

D O I：

10.1016/j.biortech.2014.06.109

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Co-pyrolysis of biomass with polyethylene terephthalate (PET) was studied as a function of blend ratio and co-pyrolysis temperature by C-13 and H-1 solid-state nuclear magnetic resonance (NMR). The C-13 NMR spectra showed that upon heating to 400 degrees C in presence of the biomass, the formation of crystallites in PET was completely suppressed and that at higher temperatures there was increased formation and growth of the polycyclic aromatic hydrocarbons ( PAHs). This change in the PET degradation behaviour was attributed to the presence of radicals formed in char from biomass. The measurement of the H-1-T-1 relaxation enabled monitoring the changes in the concentrations of radicals formed, as a function of the blend ratios and the co-pyrolysis temperatures. It indicated that the increase in the radical concentrations correlated well with the increased degradation of the PET and growth of PAHs. (C) 2014 Published by Elsevier Ltd.

引用

页码：248 / 255

页数：8

共 27 条

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