Catalyst accessibility in high volatile bituminous coal: Quarterly report

Technical Report · Wed Apr 01 04:00:00 EST 1987

OSTI ID:6698531

Kispert, L D

It is the aim of this research to determine catalyst accessibility and the possible formation of hydrogen bonds in swellable pores of bituminous coal samples after the samples have been subjected to swelling by appropriate solvents, temperature variation and extraction with various acids or bases. To achieve this goal, we are making use of an EPR technique recently developed in this lab involving nitroxide spin probes of different sizes, shapes and sites for hydrogen bonding. Initially we incorporated nitroxide spin probes in the swellable pores of high volatile bituminous (hvb) Alabama coal from the Mary Lee (MRI), Black Creek (MRI), and Illinois No. 5 (PSOC-669) seam at ambient pressures and at temperatures of 50 to 60/sup 0/C using toluene as the swelling solvent. Spin probes have also been incorporated this quarter into Illinois No. 6 (hv bituminous) coal from the premium coal sample program at Argonne National Laboratory. In addition coal from these seams have been preswelled in quinoline to remove acidic moieties and in acetic acid to remove basic moieties and then swelled in a millimolar toluene solution of spin probe IV to determine the relative ratio of the remaining swellable acidic sites. The new computer programs to permit on-line analysis of the EPR spectra mentioned in our last report, have now been developed and tested. Development of the computer programs has taken longer than anticipated and thus we have been unable to prepare high molecular weight spin probes using low molecular weight polymers as suggested in our January report. The difficulty with proper computer analysis of the EPR spectra of coal samples containing spin probes is the interference of the large EPR signal from coal with the weak EPR signals from the nitroxide spin probe. A satisfactory analysis method has now been developed.

• Research Organization: Alabama Univ., University (USA). Dept. of Chemistry
• DOE Contract Number: FG22-86PC90502
• OSTI ID: 6698531
• Report Number(s): DOE/PC/90502-2; ON: DE87008001
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALKYLATED AROMATICS
AROMATICS
AZAARENES
AZINES
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CATALYSTS
CHEMICAL BONDS
COAL
COMPUTERIZED SIMULATION
ELECTRON SPIN RESONANCE
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
MAGNETIC RESONANCE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PROBES
PYRIDINES
QUINOLINES
RESEARCH PROGRAMS
RESONANCE
SIMULATION
SWELLING
TOLUENE