Importance of active sites for char gasification in oxygen (air) and carbon dioxide. Annual report, October 1984-September 1985

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5850425

Jenkins, R G; Piotrowski, A

Gasification reactivities, in air and carbon dioxide, were determined by isothermal and nonisothermal thermogravimetric methods for a range of coals and heat-treated coals. The coals were of varying rank, ranging from anthracite through lignite. Nonisothermal reactivity data, in air, clearly indicate that as coal rank increases there is a decrease in gasification reactivity. The measured reactivity of a heat-treated coal is strongly influenced by the rank of the parent coal, heat-treatment temperature, heat treatment conditions and the inorganic species present in the coke/char. The catalytic influence of inorganic species on reactivity is greatest for chars derived from low-rank coals (lignite and subbituminous). In some cases, significant reduction of the minerals in high-rank coals (low-volatile bituminous and anthracite) prior to carbonization can result in modest increases in reactivity. Oxygen chemisorption, under controlled conditions has been utilized to provide a measure of carbon active concentration in the chars/cokes.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Materials Science and Engineering
• OSTI ID: 5850425
• Report Number(s): PB-86-174463/XAB
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
CHEMISORPTION
COAL
COAL GASIFICATION
COAL RANK
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HEAT TREATMENTS
KINETICS
MATERIALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
THERMOCHEMICAL PROCESSES