COMPARATIVE STUDIES ON THE PYROLYSIS BEHAVIOR OF LIGNINS FROM DIFFERENT WOOD SPECIES
Despite of the arousing importance of biomass pyrolysis, there is a lack of knowledge of the pyrolysis behavior of lignin --one of the main components in biomass, due to the structural complexity and the difficulty in isolation. The present paper addresses this issue by extracting iignins from manchurian ash and Mongolian scotch pine using Bjorkman procedure, which nearly not alters the structure of lignin. A Fourier transform infrared spectrometry was applied to characterize the microstructure of the Bjorkman lignins, viz. milled wood lignins (MWLs) from different wood species. The pyrolysis characteristics of WMLs were investigated using a thermogravimetric analyzer (TGA), and the release of main volatile and gaseous products during pyrolysis was on-line detected using a Fourier transform infrared (FTIR) spectroscopy. In thermal analysis, the weight loss of WMLs happened in a wide temperature range and ash MWL shows a much higher thermal degradation rate than pine MWL in the temperature range from 290 to 430℃. The residue yields were very high (for pine MWL 37wt.％ and ash MWL 26wt％ ). For a better understanding of the mechanism of lignin pyrolysis, the FTIR profiles of the main pyrolysis products(CO2, CO, methane, methanol, phenols and formaldehyde) were given. The variation of the pyrolysis products between different WMLs was also investigated.
Milled wood lignin Pyrolysis Thermogravimetric FTIR
Kai-ge Wang Shu-rong Wang Qian Liu Zhong-yang Luo Ke-fa Cen Torsten Fransson
State Key Laboratory of Clean Energy Utilization,Zhejiang University,Zheda Road 38,Hangzhou 310027,C Department of Energy Technology,Royal Institute of Technology,Stockholm,Sweden
国际会议
广州
英文
996-1003
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）