A TPD study on H/sub 2/O-gasified and O/sub 2/-chemisorbed coal chars
Steam gasification reaction of coal char is a very important reaction in both theoretical aspects and industrial applications. It is generally accepted that surface oxygen complexes on carbon substrate function as intermediate in gasification reaction and that such surface complexes are formed only at active sites. Temperature-programmed desorption (TPD) technique is very useful in yielding information on surface oxygen complexes. By using TPD technique, this paper intends to clarify the nature of surface complexes on coal char after H/sub 2/O gasification or after O/sub 2/ chemisorption. In addition, the gasification reactivity was discussed in relation to TPD patterns of H/sub 2/O-gasified char or O/sub 2/ chemisorbed char. The effect of coal type and the mineral matter in coal on TPD pattern was also investigated.
- Research Organization:
- Chemical Research Institute of Non-Aqueous Solutions, Tohoku Univ., Sendai 980
- OSTI ID:
- 6343263
- Report Number(s):
- CONF-870410-
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 32:1; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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ACTIVATION ENERGY
CARBON
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COAL GASIFICATION
CONTROL
DESORPTION
ELEMENTS
ENERGY
GASIFICATION
HYDROGEN COMPOUNDS
KINETICS
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SUBSTRATES
SURFACE PROPERTIES
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES
WATER