Importance of active sites for char gasification in oxygen (air) and carbon dioxide. Annual report, October 1985-September 1986

Technical Report · Sun Feb 01 04:00:00 EST 1987

OSTI ID:6574986

Jenkins, R G; Piotrowski, A

The objective of the study is to determine the fundamental influences of carbon-active sites, and catalytically active inorganic species, on the gasification reactivities of coal chars in air and carbon dioxide. Gasification reactivities in air have been measured on a range of coals, cokes, chars and pure carbons by isothermal and nonisothermal thermogravimetric procedures, and by infrared analysis of the carbon monoxide and dioxide evolved during the reactions. These data indicate the role of the absence or presence of inorganic species and the severity of the pyrolysis condition (i.e., the nature and concentration of carbon active sites). It has been found that catalytic effects of inherent inorganic species have a much greater influence on reactivity in chars derived from low-rank coals than those from the higher-rank coals. Active site concentrations have been estimated for both oxygen chemisorption data, and from the quantity and rates carbon oxides evolved during gasification. A Turn-over Number (TON), based on carbon reactivity and reactive surface area, can be calculated for the gas-analyses data.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Materials Science and Engineering
• OSTI ID: 6574986
• Report Number(s): PB-87-173126/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
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
KINETICS
MATERIALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
THERMOCHEMICAL PROCESSES