Carbon dioxide gasification of carbon black: isotope study of carbonate catalysis

Journal Article · Thu Nov 01 04:00:00 EST 1984 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(84)90085-X· OSTI ID:6087564

Saber, J M; Falconer, J L; Brown, L F

Temperature-programmed reaction was used with labeled isotopes (/sup 13/C and /sup 18/O) to study interactions between carbon black and potassium carbonate in pure He and 10% CO/sub 2//90% He atmospheres. Catalytic gasification precursor complexes were observed. Carbon and oxygen-bearing carbon surface groups interacted with the carbonate above 500 K to form surface complexes. Between 500 and 950 K, and in the presence of gaseous CO/sub 2/, the complexes participated in C and O exchange with the gas phase while oxygen atoms within the complexes also exchanged with those on the carbon surface. As the temperature rose, the complexes decomposed, with CO/sub 2/ the initial product. Decomposition started around 500 K in pure He, and around 950 K in CO/sub 2//He. Catalytic gasification began only after decomposition of significant portions of the complexes. Elemental potassium formed, and the active catalyst appears to alternate between being potassium metal and a potassium-oxygen-carbon complex. Potassium carbonate is not part of the catalytic cycle. 20 references, 10 figures.

• Research Organization: Univ. of Colorado, Boulder
• DOE Contract Number: FG22-82PC50798
• OSTI ID: 6087564
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 90:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKALI METAL COMPLEXES
ALKALI METAL COMPOUNDS
ALKALI METALS
ATMOSPHERES
CARBON
CARBON 13
CARBON BLACK
CARBON COMPLEXES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON ISOTOPES
CARBON OXIDES
CARBONATES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL GASIFICATION
COMPLEXES
CONTROLLED ATMOSPHERES
DATA
DECOMPOSITION
DISPERSIONS
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUIDS
GASES
GASIFICATION
HELIUM
INFORMATION
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LABELLED COMPOUNDS
LIGHT NUCLEI
METALS
MIXTURES
MONITORING
NONMETALS
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN 18
OXYGEN COMPLEXES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
POTASSIUM
POTASSIUM CARBONATES
POTASSIUM COMPLEXES
POTASSIUM COMPOUNDS
PROGRAMMING
PYROLYSIS
RARE GASES
REACTION INTERMEDIATES
REACTION KINETICS
SPECTRAL SHIFT
SPECTROSCOPY
STABLE ISOTOPES
TEMPERATURE EFFECTS
TEMPERATURE MEASUREMENT
THERMOCHEMICAL PROCESSES