Mechanism of catalytic gasification of coal char. Quarterly technical report No. 5, October 1 to December 31, 1981
The purpose of this study is to determine the mechanisms involved in the catalytic reactions of coal char and to identify the specific reaction steps and the parameters that control the catalytic process. The mode of action of the catalyst can be viewed in two ways. In one view, the catalyst participates in a reduction/oxidation cycle. The initial reaction between the carbon and the catalyst reduces the KOH to potassium accompanied by the gaseous reactant (H/sub 2/O or CO/sub 2/), producing further gaseous products (CO and H/sub 2/) and regenerating the initial state of the catalyst. In an alternative view, the catalyst initially forms an alkali metal addition compound with the carbon network of the char. The carbon-carbon bonds are altered by the formation of the metal-carbon linkage, possibly by electron transfer from the alkali metal atom to the carbon structure. As a result, the carbon structure is more readily attacked by the gaseous reactant (CO or H/sub 2/O) to produce the products of gasification. The following areas were investigated to provide experimental evidence for these catalytic modes of action: chemical kinetic measurements; thermodynamic measurements; free radicals in reacting carbon; electrical conductivity measurements. A detailed discussion on the catalyst-carbon interaction and on the reaction intermediate is provided.
- Research Organization:
- SRI International, Menlo Park, CA (USA). Materials Research Lab.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC21-80MC14593
- OSTI ID:
- 5647806
- Report Number(s):
- DOE/MC/14593-T4; ON: DE82009461
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanism of catalytic gasification of coal char. Quarterly technical progress report No. 3, 1 April-30 June 1981
Investigation of coal gasification catalysis reaction mechanisms. Quarterly technical progress report, April-June 1981. [Catalytic effects on gasification of chars by CO/sub 2/]
Related Subjects
CARBON
GASIFICATION
CHARS
COAL GASIFICATION
CATALYSIS
CHEMICAL REACTION KINETICS
POTASSIUM BROMIDES
CATALYTIC EFFECTS
POTASSIUM CARBONATES
POTASSIUM HYDROXIDES
REDOX REACTIONS
CARBON DIOXIDE
ELECTRIC CONDUCTIVITY
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
RADICALS
REACTION INTERMEDIATES
RESEARCH PROGRAMS
STEAM
TEMPERATURE EFFECTS
THERMODYNAMICS
VERY HIGH TEMPERATURE
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELECTRICAL PROPERTIES
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
KINETICS
MAGNETIC RESONANCE
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
PYROLYSIS PRODUCTS
REACTION KINETICS
RESONANCE
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification