Journal
FUEL
Volume 158, Issue -, Pages 711-718Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2015.06.014
Keywords
Raman spectroscopy; Fast pyrolysis; Gasification; Char structure; Sub-bituminous coal; Brown coal
Categories
Funding
- Australian Research Council [DP110105514]
- Commonwealth of Australia under the Australia-China Science and Research Fund
- WA Department of Mines and Petroleum
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The purpose of this study is to investigate the structural changes in nascent chars during the gasification of two low-rank coals in CO2 at 1000 degrees C and 1200 degrees C. Western Australian Collie sub-bituminous coal and Victorian Loy Yang brown coal were heated up at 1000 K s (1) in He/CO2 in a wire-mesh reactor. FT-Raman spectroscopy was applied to understand the key structural features of nascent chars. For comparison, the Raman data of the chars produced in a drop tube furnace in N-2/CO2 at 1200 degrees C for Loy Yang coal were also included in this study. The results showed that the evolution of char structure was determined by the counteracting effects of thermal annealing and oxygenation during the initial holding at 1000 degrees C (< 1 s). With further holding at 1000 degrees C or holding at 1200 degrees C, the rapid formation of O-containing functional groups and the selective consumption of small aromatic rings took place. For each coal, there was no significant change in reaction pathway between gasification at 1000 and 1200 degrees C. Combining the data from FT-Raman and FT-IR spectroscopy, there appears to be more than one type of O-containing functional groups formed during the gasification in CO2. Some are more sensitive to Raman scattering but some are more sensitive to FTIR absorption. (C) 2015 Elsevier Ltd. All rights reserved.
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