A novel approach to highly dispersing catalytic materials in coal for gasification
This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The lower cost and high catalytic activity of the latter compound will produce economic benefits by reducing the amount of K{sub 2}CO{sub 3} required for high coal char reactivities. The work is focused on the elucidation of coal-catalyst precursor interactions in solution and the variables which control the adsorption and dispersion of coal gasification metal catalysts. In order to optimize coal-metal ion interactions and hence maximize catalyst activity, the study examines the surface electrochemistry of a lignite, subbituminous, and bituminous coals and their demineralized and oxidized derivatives prior to loading with the catalytic materials. The surface electrical properties of the coals are investigated with the aid of electrophoresis, while the effects of the surface charge on the adsorption of K{sup +} and Ca{sup 2+} are studied by agitating the coals with aqueous solutions of potassium or calcium. Zeta potential studies show that the surfaces of the coals are negatively charged between about pH 2 to 11, the negative charge density increased with increase in pH and decreased with increase in coal rank. Highly alkaline media promoted calcium and potassium adsorption due to the high negative charge density on the coals, while uptake of the metals was inhibited in strongly acidic solutions. The latter conditions also resulted in the extraction of inherent iron from the coals into solution. 11 refs., 4 figs., 1 tab.
- Research Organization:
- Clark Atlanta Univ., GA (USA). Research Center for Science and Technology
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- FG22-89PC89760
- OSTI ID:
- 6250344
- Report Number(s):
- DOE/PC/89760-T2; ON: DE91008943
- Country of Publication:
- United States
- Language:
- English
Similar Records
A novel approach to highly dispersing catalytic materials in coal for gasification
A novel approach to highly dispersing catalytic materials in coal for gasification. First quarterly report, October 1, 1989--December 31, 1989
Related Subjects
BITUMINOUS COAL
SURFACE PROPERTIES
CALCIUM COMPOUNDS
CATALYTIC EFFECTS
CATALYSTS
CHEMICAL PREPARATION
COAL GASIFICATION
LIGNITE
POTASSIUM CARBONATES
SUBBITUMINOUS COAL
ACETATES
ACTIVATION ENERGY
ADSORPTION
CHARS
CHEMICAL ANALYSIS
COAL RANK
CORRELATIONS
COST
DEMINERALIZATION
DISTRIBUTION
ELECTROCHEMISTRY
ELECTROPHORESIS
OPTIMIZATION
OXIDATION
PH VALUE
PROGRESS REPORT
SURFACE POTENTIAL
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BLACK COAL
BROWN COAL
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CARBOXYLIC ACID SALTS
CHEMICAL REACTIONS
CHEMISTRY
COAL
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
MATERIALS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTENTIALS
PYROLYSIS PRODUCTS
SEPARATION PROCESSES
SORPTION
SYNTHESIS
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
010600 - Coal
Lignite
& Peat- Properties & Composition