Investigation of water and hydroxyl groups associated with coal fly ash by thermal desorption and fourier transform infrared photoacoustic spectroscopies
Thermal desorption spectrometry (TDS) and Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS) have been used in combination to analyze the water and hydroxyl groups associated with four coal fly ashes. Measurements using the former technique on these ashes resulted in identification of three water desorption regions in the temperature range from 25/sup 0/ to 1100/sup 0/C. The regions consisted of a small desorption peak at 50/sup 0/, a broad band from 180/sup 0/ to 400/sup 0/, and an intense peak from 400/sup 0/ to 590/sup 0/. No additional water desorption was observed up to 1100/sup 0/. A fourth ash gave a similar spectrum except that it lacked the intense last peak. The TDS spectra together with FT-IR/PAS spectra taken on samples exposed to pre- and post-desorption peak temperatures allowed the first TDS peak to be assigned to the desorption of physically adsorbed water, the broad band to desorption of hydrogenbonded surface hydroxyls, and the intense last peak to the decomposition of Ca(OH)/sub 2/.
- Research Organization:
- Ames Laboratory-U. S. Department of Energy, Iowa State University, Ames, Iowa 50011
- OSTI ID:
- 5838444
- Journal Information:
- Appl. Spectrosc.; (United States), Vol. 39:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
CHEMICAL ANALYSIS
COMBUSTION
WASTES
FLY ASH
DESORPTION
FOURIER TRANSFORMATION
HYDROXYL RADICALS
INFRARED SPECTRA
MATERIALS RECOVERY
PHOTOACOUSTIC SPECTROSCOPY
WASTE PROCESSING
WATER VAPOR
AEROSOL WASTES
ASHES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
INTEGRAL TRANSFORMATIONS
MANAGEMENT
MATERIALS
OXIDATION
PROCESSING
RADICALS
RECOVERY
RESIDUES
SPECTRA
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS
VAPORS
WASTE MANAGEMENT
010600* - Coal
Lignite
& Peat- Properties & Composition
010800 - Coal
Lignite
& Peat- Waste Management