The role of catalyst precursor anions in coal gasification
The aims of the proposed project are to enrich our understanding of the roles of various aqueous soluble catalyst precursor anions on the surface electrical properties of coal and to ascertain the influence of the surface charge on the adsorption, dispersion, and activities of calcium and potassium. These goals will be achieved by impregnating a demineralized North Dakota lignite (PSOC 1482) with calcium or potassium catalyst precursors containing acetate (CH[sub 3]COO[sup [minus]]), chloride (CI[sup [minus]]), nitrate (NO[sub 3][sup [minus]]), sulfate (SO[sub 4][sup 2[minus]]), and carbonate (CO[sub 3][sup 2[minus]]) anions. In the past quarter, the effects of (CH[sub 3]COO[sup [minus]]), CI[sup [minus]], (NO[sub 3][sup [minus]]), (CO[sub 3][sup 2[minus]]) or (CO[sub 3][sup 2[minus]]) on the surface charge properties of the coal has been initiated using the calcium salts of these anions. Like the corresponding potassium compounds investigated previously, increasing anion concentrations produce less negative charge on the coal surface through the interaction of calcium ions with the surface. This was confirmed by metal adsorption and chemical analysis of the filtered coal particles. The extent of metal adsorption was strongly dependent on the catalyst precursor. For potassium, maximum metal uptake from solution was obtained using potassium carbonate, followed by potassium acetate, while the lowest metal loadings were obtained when using the chloride, nitrate or the sulfate of potassium. The adsorption data are generally in agreement with the zeta potential results and suggest electrostatic attraction between the metal cation and the anionic coal surface. Fourier transform infrared studies are in progress to elucidate the coal-catalyst interactions.
- Research Organization:
- Clark Atlanta Univ., GA (United States). Research Center for Science and Technology
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-91PC91286
- OSTI ID:
- 6940748
- Report Number(s):
- DOE/PC/91286-T4; ON: DE93006487
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM COMPOUNDS
CATALYTIC EFFECTS
CATALYSTS
PRECURSOR
COAL GASIFICATION
LIGNITE
SURFACE PROPERTIES
POTASSIUM COMPOUNDS
ACETATES
ADSORPTION
ANIONS
CARBONATES
CHLORIDES
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
NITRATES
PH VALUE
PROGRESS REPORT
SULFATES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BROWN COAL
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBOXYLIC ACID SALTS
CHARGED PARTICLES
CHLORINE COMPOUNDS
COAL
DATA
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IONS
MATERIALS
NITROGEN COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SORPTION
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification