High-temperature oxidation of rhodium
- General Motors Corp., Flint, MI (USA)
The oxidation kinetics Rh were measured in air at 1 atm. in the temperature range 600-1,000{degree}C. The oxidation weight gain proceeds logarithmically at the lower temperatures (600{degree}, 650{degree}C) followed by a transition to power law behavior at the higher temperature ({>=} 800{degree}C). The logarithmic growth kinetics result from thickening of a hexagonal Rh{sub 2}O{sub 3} scale. The transition from logarithmic to power law growth kinetics occurs in the range 700-800{degree}C, and reflects thickening of hexagonal and orthorhombic Rh{sub 2}O{sub 3} scales. Above 800{degree}C, the growth kinetics result from thickening of a predominately orthorhombic Rh{sub 2}O{sub 3} scale. At 1,000{degree}C the oxide becomes volatile, leaving the metal surface exposed.
- OSTI ID:
- 5363531
- Journal Information:
- Oxidation of Metals; (United States), Journal Name: Oxidation of Metals; (United States) Vol. 34:1-2; ISSN 0030-770X; ISSN OXMEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330701 -- Emission Control-- Nitrogen Oxides
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
AIR
ATMOSPHERIC PRESSURE
CATALYSTS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DENITRIFICATION
DIFFRACTION
ELEMENTS
EQUIPMENT
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
KINETICS
METALS
MORPHOLOGY
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
REMOVAL
RHODIUM
RHODIUM COMPOUNDS
RHODIUM OXIDES
SCALING
SCATTERING
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
VOLATILITY
WASTES
WEIGHT
X-RAY DIFFRACTION