TY - JOUR
T1 - Diagnostics of carbon gasification by Raman microprobe spectroscopy
AU - Bar-Ziv, Ezra
AU - Zaida, Alon
AU - Salatino, Piero
AU - Senneca, Osvalda
N1 - Funding Information:
We would like to thank Oded Navon, from the Hebrew University of Jerusalem, for enabling us to use the Raman spectrometer. We also acknowledge Tsachi Livneh for useful discussions. The assistance of Mr. Sabato Masi in performing TGA experiments is gratefully acknowledged. This research was partially supported by a grant from Israel Science Foundation, no. 239/98.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - The objective of this study is to examine the possibility of using Raman microprobe spectroscopy to investigate the effects of heat treatment on the evolution of reactivity and morphology of carbons. In this study, two carbons were used: petroleum coke (PC) and South African (SA) coal. Samples of the untreated carbons and samples that were heat treated in nitrogen at temperatures in the range 500-2000 °C for different times were characterized by (1) thermogravimetric analysis in air at 500 °C and in CO2 at 900 °C and (2) Raman microprobe spectroscopy in the range 200-2500 cm-1. The effects of mineral matter on Raman spectra were found to be negligible. Since the Raman scattering depth is a few tens of nanometers, it is believed that a carbon layer larger than that coats mineral matters. A good correlation was found between gasification reactivity and Raman properties for samples of the two carbons that were heat treated up to 1200 °C for 30 min holding time. In this range of heat treatment conditions, the ratio between the intensity of the low and high wave numbers correlated satisfactorily with both O2 and CO2 char gasification reactivity. Small changes in Raman properties were observed for more severe heat treatments, despite further reactivity loss corresponding to such treatments.
AB - The objective of this study is to examine the possibility of using Raman microprobe spectroscopy to investigate the effects of heat treatment on the evolution of reactivity and morphology of carbons. In this study, two carbons were used: petroleum coke (PC) and South African (SA) coal. Samples of the untreated carbons and samples that were heat treated in nitrogen at temperatures in the range 500-2000 °C for different times were characterized by (1) thermogravimetric analysis in air at 500 °C and in CO2 at 900 °C and (2) Raman microprobe spectroscopy in the range 200-2500 cm-1. The effects of mineral matter on Raman spectra were found to be negligible. Since the Raman scattering depth is a few tens of nanometers, it is believed that a carbon layer larger than that coats mineral matters. A good correlation was found between gasification reactivity and Raman properties for samples of the two carbons that were heat treated up to 1200 °C for 30 min holding time. In this range of heat treatment conditions, the ratio between the intensity of the low and high wave numbers correlated satisfactorily with both O2 and CO2 char gasification reactivity. Small changes in Raman properties were observed for more severe heat treatments, despite further reactivity loss corresponding to such treatments.
UR - http://www.scopus.com/inward/record.url?scp=84907616246&partnerID=8YFLogxK
U2 - 10.1016/S0082-0784(00)80649-9
DO - 10.1016/S0082-0784(00)80649-9
M3 - Conference article
AN - SCOPUS:84907616246
SN - 1540-7489
VL - 28
SP - 2369
EP - 2374
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 2
T2 - 30th International Symposium on Combustion
Y2 - 25 July 2004 through 30 July 2004
ER -