Electrochemical studies of graphite oxidation in sodium carbonate melt

Journal Article · Thu Mar 01 04:00:00 EST 1984 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00175a008· OSTI ID:6674442

Dunks, G B

The oxidation of spectroscopic grade graphite in sparged beds of sodium carbonate employing air, nitrogen, and carbon dioxide was investigated at 900 /sup 0/C by using electrochemical techniques. Evidence for the formation of metallic sodium suggested that a first step in the oxidation process was the reduction of sodium ion by graphite. The positive centers thus generated in the graphite matrix apparently reacted with oxyanions in the melt to produce carbon monoxide. The oxidation rate of a graphite electrode using carbon dioxide containing sparge gas was increased by application of positive potentials and decreased by application of negative potentials, which supports such an ionic mechanism. The initial rates of graphite oxidation using nitrogen or carbon dioxide sparge were approximately equal and were 6.5 times slower than the rate using air. Sequences of reactions are proposed for the oxidation of graphite using air, carbon dioxide, and nitrogen sparge gases in sodium carbonate melt.

• Research Organization: Rockwell International Corp., Canoga Park, CA
• DOE Contract Number: AT03-76ER70030
• OSTI ID: 6674442
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 23:7; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400400* -- Electrochemistry
AIR
ALKALI METAL COMPOUNDS
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DATA ANALYSIS
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELEMENTAL MINERALS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
GRAPHITE
INFORMATION
KINETICS
MINERALS
NITROGEN
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SODIUM CARBONATES
SODIUM COMPOUNDS
VERY HIGH TEMPERATURE