Thermodynamics and kinetics of carbon dioxide chemisorption on calcium oxide
Journal Article
·
· J. Phys. Chem.; (United States)
Equilibrium chemisorption of CO/sub 2/ on CaO was measured at 923-1013 K, and the kinetics of rapid adsorption and of slow dissolution of CO/sub 2/ in the CaO, perhaps as CO/sub 3//sup 2 -/ at grain boundaries, were measured in 1333 Pa of CO/sub 2/ at 983-1033 K. Surface areas were measured by the BET method. From the assumptions that only (100) surfaces of the CaO were exposed, it was calculated that approx. 55-99% of the surface O/sup 2 -/ ions reacted with CO/sub 2/ to form CO/sub 3//sup 2 -/ ions. The enthalpy of adsorption was -199 +/- 8 kJ/mol and the thermal entropy of adsorption was -153 +/- 8 J/(mol deg). Both values were somewhat less negative at > 80% coverage. The apparent activation enthalpy for adsorption was 61 +/- 10 kJ/mol. The apparent activation enthalpy of the slow dissolution process was 303 +/- 15 kJ/mol. 16 references, 4 figures, 1 table.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5985098
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:18; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ADSORPTION ISOTHERMS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
DATA
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
ISOTHERM
KINETICS
LOW PRESSURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
VERY HIGH TEMPERATURE
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ADSORPTION ISOTHERMS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
DATA
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
ISOTHERM
KINETICS
LOW PRESSURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
VERY HIGH TEMPERATURE