TY - JOUR
T1 - Drastic changes in biomass char structure and reactivity upon contact with steam
AU - Keown, Daniel M.
AU - Hayashi, Jun Ichiro
AU - Li, Chun Zhu
N1 - Funding Information:
The authors gratefully acknowledge the financial support of this study by the New Energy and Industrial Technology Development Organisation (NEDO) in Japan. The authors also gratefully acknowledge the partial funding from the Australian Government as part of the Asia-Pacific Partnership on Clean Development and Climate. The authors also thank Drs T.F. Dixon and P. Hobson at the Sugar Research Institute (SRI) in Australia for supplying the sugar cane trash sample.
PY - 2008/6
Y1 - 2008/6
N2 - An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700-900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of char with steam, even only for 20 s when the char conversion was minimal, resulted in drastic reduction in the intrinsic reactivity of char with air at 400 °C. The decreases in the char reactivity were not mainly due to the possible volatilisation of inherent catalysts during gasification in steam. Instead, the FT-Raman spectroscopy of the chars showed that the gasification of char with steam resulted in drastic changes in char structure including the transformation of smaller ring systems (3-5 fused rings) to large ring systems (≥6 fused rings). It is believed that the intermediates of char-steam reactions, especially H, penetrated deep into the char matrix to induce the ring condensation reactions.
AB - An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700-900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of char with steam, even only for 20 s when the char conversion was minimal, resulted in drastic reduction in the intrinsic reactivity of char with air at 400 °C. The decreases in the char reactivity were not mainly due to the possible volatilisation of inherent catalysts during gasification in steam. Instead, the FT-Raman spectroscopy of the chars showed that the gasification of char with steam resulted in drastic changes in char structure including the transformation of smaller ring systems (3-5 fused rings) to large ring systems (≥6 fused rings). It is believed that the intermediates of char-steam reactions, especially H, penetrated deep into the char matrix to induce the ring condensation reactions.
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U2 - 10.1016/j.fuel.2007.05.057
DO - 10.1016/j.fuel.2007.05.057
M3 - Article
AN - SCOPUS:40249114008
SN - 0016-2361
VL - 87
SP - 1127
EP - 1132
JO - Fuel
JF - Fuel
IS - 7
ER -