EPR study of nitroxide spin probe doped Illinois No. 6 coal from the Premium Coal Sample program: reactive site distribution

Conference · Thu Jan 01 04:00:00 EST 1987 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:6136891

Kispert, L D; Cooray, L S; Wuu, S K

Recently, we reported a method to determine the relative pore (accessibility) size and number distribution in selected high-volatile bituminous coal samples by diffusing nitroxide spin probes of different shapes, varying in diameter or length from 0.47 nm to 3.5 nm, into the swellable pores of the coal samples. The relative spin probe concentration was measured by Electron Paramagnetic Resonance (EPR) methods for each sized spin probe. From these measurements, a relative number and size distribution was estimated for the swellable pores of Mary Lee (MRI, PSOC-271) and Black Creek (MRI) coal seams of Alabama and the Illinois no. 5 (PSOC-699) seam. This study reports the results of a series of similar but small sized spin probes (/approximately/ 0.6 nm in diameter), each containing a different reactive substituent, to determine the number distribution of reactive sites containing acid, phenol and amine substituents. The smaller size of the spin probes with reactive sites, will permit a measure of all accessible sites with diameters greater then approximately 0.6 nm. In addition, a study was made to differentiate hydrogen-bonding to the nitroxyl group from that of a substituent group in swellable pores with diameters of approximately 0.4-0.6 nm.

• Research Organization: Univ. of Alabama, Tuscaloosa (USA)
• OSTI ID: 6136891
• Report Number(s): CONF-870802-
• Conference Information: Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 32:4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
AMINES
AROMATICS
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
DATA
DOPED MATERIALS
ELECTRON SPIN RESONANCE
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ACIDS
MAGNETIC RESONANCE
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
QUALITATIVE CHEMICAL ANALYSIS
RESONANCE