Diagnostics of carbon gasification by Raman microprobe spectroscopy

Ezra Bar-Ziv, Alon Zaida, Piero Salatino, Osvalda Senneca

Research output: Contribution to journalConference articlepeer-review

65 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)2369-2374
Number of pages6
JournalProceedings of the Combustion Institute
Volume28
Issue number2
DOIs
StatePublished - 1 Jan 2000
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: 25 Jul 200430 Jul 2004

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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