Reactivities of heat-treated coals in hydrogen. [9 refs. ; coal charred to 1000/sup 0/C; reactivities in H/sub 2/ at 400 psig and 980/sup 0/C; effect of coal rank]

Conference · Wed Jan 01 04:00:00 EST 1975 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:7340829

Tomita, A; Mahajan, O P; Walker, Jr, P L

Reactivities of eighteen, 40 x 100 mesh, U.S. coals charred to 1000/sup 0/C have been measured in H/sub 2/ at 400 psig and 980/sup 0/C. Chars prepared from low rank coals are generally more reactive than those derived from high rank coals, although in some cases reactivities are significantly higher than those predicted from rank. Reactivity parameters for the chars in H/sub 2/ are different from those measured for the same set of chars in air at 500/sup 0/C and CO/sub 2/ at 900/sup 0/C. Results indicate specificity in catalytic behavior of mineral matter associated with chars towards gasification in oxidizing and reducing atmospheres. Reactivities have also been measured for chars prepared from six coals acid-washed with HCl and four coals demineralized with HF. Partial or complete removal of mineral matter, in most cases, decreases char reactivity; higher reactivities observed in some cases have been attributed to modification of pore structure of chars upon mineral matter removal. Effect of hydrogen pressure and reaction temperature on reactivity has been investigated for one lignitic char. An apparent activation energy of about 44 kcal/mole was obtained for this char. Effect of particle size on reactivity of a lignitic char and a low volatile bituminous char are discussed.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 7340829
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 20:3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010403* -- Coal & Coal Products-- Hydrogenation-- (-1987)
ACTIVATION ENERGY
AIR
BROWN COAL
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CATALYSTS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL
COAL RANK
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HYDROGEN
HYDROGENATION
LIGNITE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POROSITY
PRESSURE DEPENDENCE
SIZE
TEMPERATURE DEPENDENCE