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| Pyrolysis Characteristics of Hemicelluloses from Bamboo Stem |
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| DOI：10.11980/j.issn.0254-508X.2012.11.002 |
| Key Words:bamboo stem hemicelluloses thermal gravimetric analysis pyrolysis characteristics |
| Fund Project:国家自然科学基金（30960304）；江西省教育厅基金（GJJ10045）。 |
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| Abstract:Water-soluble hemicelluloses HW and four alkali-soluble hemicellulosic fractions H1~H4 were sequentially extracted from six-month-old bamboo stem by distilled water, 2% NaOH and 5% KOH. The thermal pyrolysis behavior of the five hemicellulosic fractions was characterized by using thermal gravimetric analysis (TGA) at the heating rate of 10℃/min, and the first-order reaction models were established in the fast pyrolysis temperature ranges. The fast decompositions of the five fractions happened in between 180~400℃ with weight losses 33.91%~42.54%. The residue percentages were 34.52%~51.31% at the final temperature of 700℃. The activity energies of all the hemicelluloses fractions were quite low with the values of 26.068~51.938 kJ/mol. The activity energies of alkali-soluble fractions were higher than that of water-soluble fraction. The hemicellulosic fractions containing higher lignin residue exhibited higher activity energy and residue rate at the final temperature of pyrolysis. |
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