The role of catalyst precursor anions in coal gasification

Technical Report · Fri Aug 28 00:00:00 EDT 1992

DOI:https://doi.org/10.2172/6970557· OSTI ID:6970557

Abotsi, G M.K.

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 North Dakota lignite (PSOC 1482) and its demineralized derivative with calcium or potassium catalyst precursors containing acetate (CH{sub 3}COO{sup {minus}}), chloride (Cl{sup {minus}}), nitrate (NO{sub 3}{sup {minus}}), sulfate (SO{sub 4}{sup 2{minus}}), and carbonate (CO{sub 3}{sup 2{minus}}) anions. Catalyst loading will be conducted under well-controlled conditions of solution pH and ionic strength. In the last quarter, the surface charge properties of the coal was determined as a function of acetate (CH{sub 3}COO{sup {minus}}), chloride (Cl{sup {minus}}), nitrate (NO{sup 3}{sup {minus}}), carbonate (CO{sub 3}{sup 2{minus}}) or sulfate (SO{sub 4}{sup 2{minus}})concentration using the respective potassium salts of these anions. In general, low anion concentrations (10{sup {minus}3} or 10{sup {minus}2} mol/L) had little effect on the zeta potentials of the coals. However, the surface charge densities of the coal become less negative at 10-1 mol/L of the nitrate, carbonate or sulfate anions. These trends suggest that the surface charge density of the coal is controlled by the adsorption of potassium ions (K{sup +}) onto the coal particles. The net negative charge on the coal panicles creates a repulsive force between the anions and the coal surface and prevents the anions from exerting any significant effect on the coal's electrokinetic properties.

• 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: 6970557
• Report Number(s): DOE/PC/91286-T3; ON: DE92041240
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ANIONS
ADSORPTION
COAL
SORPTIVE PROPERTIES
COAL GASIFICATION
CATALYSTS
CALCIUM
NUMERICAL DATA
POTASSIUM
PROGRESS REPORT
ALKALI METALS
ALKALINE EARTH METALS
CARBONACEOUS MATERIALS
CHARGED PARTICLES
DATA
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
INFORMATION
IONS
MATERIALS
METALS
SORPTION
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification