TY - JOUR
T1 - Further development of Raman Microprobe spectroscopy for characterization of char reactivity
AU - Zaida, Alon
AU - Bar-Ziv, Ezra
AU - Radovic, Ljubisa R.
AU - Lee, Young Jae
N1 - Funding Information:
This study was partially supported by Binational Science Foundation (BSF) Grant No. 2002408.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2007
Y1 - 2007
N2 - The effect of heat treatment on reactivity of cellulose char was investigated, using two methods: (1) Raman Microprobe spectroscopy analysis (RMA) and (2) thermogravimetric analysis (TGA). The heat-treatment was in the temperature range of 600-2600°C, temperature prevailing in combustion of coal-chars. In the RMA, first- and second-order Raman spectra in the range of 800-2000 and 20003600 cm-1, respectively, were measured for all samples. In the first-order Raman spectra, the following bands have been observed: D band and G (at 1350 and 1590 cm-1 respectively), 1150 and 1450 cm-1. In the second-order Raman spectra, four bands have been observed at 2450, 2700, 2940 and 3250 cm-1. Both first- and second-order Raman spectra were fitted by Lorentzian functions. The Lorentzian parameters (bandwidth and intensity ratio) showed significant changes with heat treatment, which is consistent with structural modification. Also, from TGA experiments we observed the expected significant influence of heat treatment on char reactivity. Attempts were made to correlate the Lorentzian parameters with char reactivity. A good correlation was found between the 2940 cm-1 bandwidth in the second-order Raman spectrum and char reactivity, confirming the strong connection between char structure and its reactivity, and illustrating the usefulness of RMA in such studies.
AB - The effect of heat treatment on reactivity of cellulose char was investigated, using two methods: (1) Raman Microprobe spectroscopy analysis (RMA) and (2) thermogravimetric analysis (TGA). The heat-treatment was in the temperature range of 600-2600°C, temperature prevailing in combustion of coal-chars. In the RMA, first- and second-order Raman spectra in the range of 800-2000 and 20003600 cm-1, respectively, were measured for all samples. In the first-order Raman spectra, the following bands have been observed: D band and G (at 1350 and 1590 cm-1 respectively), 1150 and 1450 cm-1. In the second-order Raman spectra, four bands have been observed at 2450, 2700, 2940 and 3250 cm-1. Both first- and second-order Raman spectra were fitted by Lorentzian functions. The Lorentzian parameters (bandwidth and intensity ratio) showed significant changes with heat treatment, which is consistent with structural modification. Also, from TGA experiments we observed the expected significant influence of heat treatment on char reactivity. Attempts were made to correlate the Lorentzian parameters with char reactivity. A good correlation was found between the 2940 cm-1 bandwidth in the second-order Raman spectrum and char reactivity, confirming the strong connection between char structure and its reactivity, and illustrating the usefulness of RMA in such studies.
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U2 - 10.1016/j.proci.2006.07.011
DO - 10.1016/j.proci.2006.07.011
M3 - Conference article
AN - SCOPUS:34548801795
SN - 1540-7489
VL - 31 II
SP - 1881
EP - 1887
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
T2 - 31st International Symposium on Combustion
Y2 - 5 August 2006 through 11 August 2006
ER -