Graphite oxidation in sodium carbonate/sodium sulfate melts

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00131a021· OSTI ID:5809038

Dunks, G B; Stelman, D; Yosim, S J

The oxidation of spectroscopic grade graphite in sodium carbonate/sodium sulfate melts using oxidizing (air and oxygen) or inert (argon and nitrogen) sparge was investigated between 900 and 1000/sup 0/C. The oxidation rate increased with increasing graphite surface area, increasing melt temperature, and increasing oxygen concentration. The rate, in oxidizing atmospheres, at 900/sup 0/C was faster in pure sodium carbonate than in pure sodium sulfate with the maximum rate observed in mixed melts. At 950/sup 0/C the oxidation rate was virtually equal in the two pure melts, and at 982/sup 0/C the rate was faster in pure sodium sulfate. In melts containing sodium sulfate, the rate-determining step was apparently the same for reactions conducted in oxidizing and inert atmospheres, with sodium sulfate acting as a catalyst in the former and a reagent in the latter. Sequences of reactions are proposed for the oxidation of graphite in pure sodium carbonate, pure sodium sulfate, and mixed melts.

• Research Organization: Rockwell International Corp., Canoga Park, CA
• OSTI ID: 5809038
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 21:1; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AIR
ALKALI METAL COMPOUNDS
ARGON
CARBON
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
GRAPHITE
INFORMATION
KINETICS
NITROGEN
NONMETALS
NUMERICAL DATA
OXIDATION
OXYGEN
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
SODIUM CARBONATES
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE