Catalyzed gasification of coals and coal chars. [20 refs. ; 500 to 1000 psig; 650 to 850/sup 0/C; KHCO/sub 3/; NaHCO/sub 3/; ZnCl/sub 2/; CH/sub 3/COOAg; UO/sub 2/(NO/sub 3/)/sub 2/; CoCl/sub 2/; Pb(NO/sub 3/)/sub 2/; NiCO/sub 3/; ZnO; WS/sub 2/; CoCO/sub 3/; Al/sub 2/O/sub 3/--SiO/sub 2/]

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

OSTI ID:7264822

Wilks, K A; Gardner, N C; Angus, J C

Gasification of high volatile bituminous coals and coal chars with hydrogen and steam was studied at 500 and 1000 psig and 650 to 850/sup 0/C in a thermobalance. The following classes of catalysts were used singly and in combination: acidic cracking catalysts, methanation catalysts, hydrogenation catalysts and potassium salts. Simple mathematical modelling indicates that for catalyzed and noncatalyzed systems the geometric similarity of the coal particles change as they are gasified, and hence the mass transfer rates change also. The catalysts had relatively little influence on the initial devolatilization, but had a strong influence on the pre-exponential factor and activation energy of the gasification of the residual char. Annealing of the coal samples in the presence of the catalyst before reaction increased the ultimate reaction rate. It is not known whether this is caused by diffusion of the catalyst into the mass, or whether the specific surface area of the sample was affected. Potassium salts, acting by themselves, were the most effective. In all cases, at least 5 wt. percent of catalyst was required, indicating that physical as well as purely chemical catalytic processes may be operative.

• Research Organization: Case Western Reserve Univ., Cleveland
• OSTI ID: 7264822
• Journal Information: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States), Vol. 20:3; Conference: 170. American Chemical Society national meeting, Chicago, IL, USA, 24 Aug 1975; Other Information: See CONF-750806--P1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BITUMINOUS COAL
VOLATILITY
COAL GASIFICATION
CHEMICAL REACTION KINETICS
ALUMINIUM OXIDES
CATALYSTS
CHARS
COBALT CARBONATES
COBALT CHLORIDES
HIGH TEMPERATURE
LEAD NITRATES
MEDIUM PRESSURE
NICKEL CARBONATES
POTASSIUM CARBONATES
SILICON OXIDES
SODIUM CARBONATES
STEAM
SURFACE PROPERTIES
TUNGSTEN SULFIDES
URANYL NITRATES
VERY HIGH TEMPERATURE
ZINC CHLORIDES
ZINC OXIDES
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BLACK COAL
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COAL
COBALT COMPOUNDS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HALIDES
HALOGEN COMPOUNDS
KINETICS
LEAD COMPOUNDS
NICKEL COMPOUNDS
NITRATES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
REACTION KINETICS
SILICON COMPOUNDS
SODIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
URANIUM COMPOUNDS
URANYL COMPOUNDS
ZINC COMPOUNDS
ZINC HALIDES
010404* - Coal
Lignite
& Peat- Gasification