Catalysis of char gasification by minerals

Conference · Sat Jan 01 04:00:00 EST 1977 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:6610025

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

It is well known that most minerals act more or less to catalyze carbon gasification. Because of current interest in coal gasification, it is desirable to know the extent to which inorganic impurities in chars (as a result of being present in the original coals) increases gasification rates. The aim of the present study is to investigate possible catalytic activity of major minerals found in coals for char gasification in air, CO/sub 2/, and H/sub 2/. Since coals and, hence, chars are invariably associated with many inorganic impurities, a high purity polymer char having a structure similar to coal-derived chars has been used in the study. The high purity char was obtained by carbonizing Saran in the manner described previously. The following minerals were used: kaolinite, illite, calcite, dolomite, gypsum, quartz, rutile, pyrite and siderite. Reactivity parameters for various char-mineral mixtures in air, CO/sub 2/ and H/sub 2/ are listed. The results indicate little or no catalytic effect of the minerals studied on char reactivity in air. Pyrite, gypsum, kaolinite and calcite inhibit the reaction in CO/sub 2/; the effect is most pronounced for pyrite. Although both C--CO/sub 2/ and C--O/sub 2/ gasification reactions involve an intermediate oxygen transfer step, the aforementioned minerals inhibit the reaction in CO/sub 2/ whereas they have no such effect in O/sub 2/. This shows high catalytic specificity for gasification reactions in different oxidizing atmospheres. Most of the minerals have an effect, either catalytic or inhibitive, on the hydrogasification reaction. Siderite and pyrite show large catalytic activity. Both these minerals contain iron as a major component and it is well known that metallic iron catalyzes the C--H/sub 2/ reaction. Illite, gypsum, rutile, kaolinite and calcite have an inhibitive effect on the hydrogasification reaction. The inhibitive effect is most pronounced for calcite.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 6610025
• Report Number(s): CONF-770301-P2
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 22:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
AIR
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATE ROCKS
CARBONATES
CATALYTIC EFFECTS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CLAYS
COAL GASIFICATION
CRYOGENIC FLUIDS
DOLOMITE
ELEMENTS
FLUIDS
GASES
GASIFICATION
GYPSUM
HYDROGEN
ILLITE
IRON CARBONATES
IRON COMPOUNDS
IRON ORES
IRON SULFIDES
KAOLINITE
KINETICS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NONMETALS
ORES
OXIDES
OXYGEN COMPOUNDS
PYRITE
PYRITES
PYROLYSIS PRODUCTS
QUARTZ
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
REACTION KINETICS
RESERVOIR ROCK
ROCKS
RUTILE
SIDERITE
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SULFATES
SULFIDES
SULFUR COMPOUNDS
SULFUR ORES
THERMOCHEMICAL PROCESSES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS