Thermodynamics of gas phase chromium species: The chromium oxides, the chromium oxyhydroxides, and volatility calculations in waste incineration processes

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(93)90087-J· OSTI ID:6532740

Ebbinghaus, B B ^[1]

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1. Univ. of California, Livermore (United States)

The thermodynamics of three gaseous chromium oxides and twelve gaseous chromium oxyhydroxides are assessed for application to chromium volatility calculations in waste incineration processes. For the oxyhydroxides, the thermodynamic properties, (a) entropy at 298 K, (b) enthalpy at 298 K minus enthalpy at [phi] K, (c) free energy function, and (d) heat capacity, are calculated by the molecular constant method using estimated molecular parameters. The enthalpies of formation at 298 K (e), of the chromium oxides and the chromium oxyhydroxides are determined either from vapor pressure data when available or from bond energy correlations which use available data on the gaseous chromium oxyhalides. The thermodynamic constants are tabulated for all fifteen gaseous species. Likewise, the thermodynamic functions, (c) and (d), are given in polynomial form as a function of temperature for ranges from 298 to 1000 K and 1000 to 3000 K. Equilibrium vapor compositions over Cr[sub 2]O[sub 3](s) at fixed partial pressure of oxygen (0.10 atm) and water (0.10 atm) and temperatures in the range of 800 to 1600 K show that CrO[sub 2](OH)[sub 2](g) is the dominant vapor species with small contributions from CrO(OH)[sub 3](g), CrO[sub 3](g), CrO[sub 2]OH(g), and CrO(OH)[sub 2](g).

• OSTI ID: 6532740
• Journal Information: Combustion and Flame; (United States), Vol. 93:1-2; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CHROMIUM HYDROXIDES
THERMODYNAMIC PROPERTIES
CHROMIUM OXIDES
AIR POLLUTION CONTROL
DATA
ENTHALPY
ENTROPY
FORMATION HEAT
FREE ENERGY
INCINERATORS
SPECIFIC HEAT
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
VOLATILE MATTER
CHALCOGENIDES
CHROMIUM COMPOUNDS
CONTROL
ENERGY
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
MATTER
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLLUTION CONTROL
REACTION HEAT
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management