Abstract
The adsorption isotherms of water on Zeochem zeolite 13X were measured from 22 to 100 \(^{\circ }\text {C}\) and 0 to \(2.1\times 10^{-2}\) bar using volumetry and gravimetry. The equilibrium data was fit to a dual-site Langmuir isotherm. A series of single component H2O dynamic column breakthrough experiments were measured on zeolite 13X at \( 22\,^{\circ }\text {C}\) and 0.97 bar. These breakthrough experiments were modeled and simulated with our built in-house adsorption simulator. The simulator predicted composition and thermal breakthrough behavior well for all single component experiments. Competitive \(\text {CO}_{2}\)/\(\text {H}_{2}\text {O}\) breakthrough experiments were then performed at \( 22\,^{\circ }\text {C}\) and 0.99 bar. The collected equilibrium data showed up to a 98% loading reduction for \(\text {CO}_{2}\) (compared to the single component loading) for \(\approx \) 74.4% RH while \(\text {H}_{2}\text {O}\) showed no reduction compared to its single component loading. The binary equilibrium isotherms were described by an explicit water-loading adjusted dual-site Langmuir isotherm.
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Abbreviations
- b :
-
Adsorption equilibrium constant for site 1 (m\(^{3}\) mol\(^{-1}\))
- c :
-
Fluid phase concentration (mol m\(^{-3}\))
- \(C_\text {p}\) :
-
Heat capacity (J mol\(^{-1}\) K\(^{-1}\))
- d :
-
Adsorption equilibrium constant for site 2 (m\(^{3}\) mol\(^{-1}\))
- D :
-
Diffusivity (m\(^2\) s\(^{-1}\))
- h :
-
Heat transfer coefficient (W m\(^{-2}\) K\(^{-1}\))
- \(\Delta H\) :
-
Heat of adsorption (J mol\(^{-1}\))
- k :
-
Mass transfer coefficient (s\(^{-1}\))
- K :
-
Thermal conductivity (W m\(^{-1}\) K\(^{-1}\))
- L :
-
Length (m)
- m :
-
Adsorbent mass (kg)
- n :
-
Number of species (-)
- p :
-
Partial pressure (bar)
- P :
-
Total pressure (bar)
- q :
-
Solid phase loading (mol kg\(^{-1}\))
- \(q^*\) :
-
Equilibrium solid phase loading (mol kg\(^{-1}\))
- Q :
-
Outlet volumetric flow rate (m\(^3\) s\(^{-1}\))
- r :
-
Radius (m)
- R :
-
Universal gas constant (Pa m\(^{3}\) mol\(^{-1}\) K\(^{-1}\))
- t :
-
Time (s)
- \({\bar{t}}\) :
-
Dimensionless time (-)
- T :
-
Temperature (K)
- \(\Delta U\) :
-
Internal energy (J mol\(^{-1}\))
- v :
-
Interstitial velocity (m s\(^{-1}\))
- V :
-
Volume (m\(^{3}\))
- y :
-
Mole fraction (-)
- z :
-
Axial direction (m)
- \(\alpha\) :
-
Modified DSL saturation constant (kg mol\(^{-1}\))
- \(\beta\) :
-
Modified DSL nonlinearity constant (kg mol\(^{-1}\))
- \(\epsilon\) :
-
Bed voidage (-)
- \(\mu\) :
-
Viscosity (Pa s\(^{-1}\))
- \(\rho\) :
-
Adsorbent density (kg m\(^{-3}\))
- \(\tau\) :
-
Tortuosity (-)
- a:
-
Adsorbed phase
- acc:
-
Solid and fluid phase accumulation
- ads:
-
Adsorbent or adsorption
- amb:
-
Ambient
- ave:
-
Average
- b:
-
Bed or column
- comp:
-
Component
- d:
-
Extra-column
- des:
-
Desorption
- g:
-
Fluid phase
- i:
-
Index of species
- iso:
-
Isosteric
- in:
-
Inlet or internal
- j:
-
Index of species
- L:
-
Length or low
- m:
-
Molecular
- out:
-
Outlet or external
- p:
-
Particle
- s:
-
Solid phase
- sat:
-
Ultimate saturation
- tot:
-
Total
- w:
-
Wall
- z:
-
Axial direction
- 0:
-
Initial
- CCS:
-
Carbon capture and storage
- DCB:
-
Dynamic column breakthrough
- DSL:
-
Dual-site Langmuir isotherm
- DOE:
-
Department of energy
- MFC:
-
Mass flow controller
- MFM:
-
Mass flow meter
- MS:
-
Mass spectrometer
- PN:
-
Perfect negative pairing
- PP:
-
Perfect positive pairing
- PSA:
-
Pressure-swing adsorption
- PT:
-
Pressure transducer
- \(\Delta\)PT:
-
Differential pressure transducer
- RH:
-
Relative humidity
- RHM:
-
Relative humidity meter
- TGA:
-
Thermogravimetric analysis
- TC:
-
Thermocouple
- VEMC:
-
Virial excess mixing coefficient
- VSA:
-
Vacuum-swing adsorption
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Acknowledgements
Funding support from the Canada Foundation for Innovation John R. Evans Leaders Fund Project Number 33801 and Canada First Excellence Fund through University of Alberta Future Energy Systems are acknowledged. We thank Zeochem for providing samples of the zeolite 13X used in this study.
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Wilkins, N.S., Sawada, J.A. & Rajendran, A. Measurement of competitive \(\text {CO}_{2}\) and \(\text {H}_{2}\text {O}\) adsorption on zeolite 13X for post-combustion \(\text {CO}_{2}\) capture. Adsorption 26, 765–779 (2020). https://doi.org/10.1007/s10450-020-00199-3
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DOI: https://doi.org/10.1007/s10450-020-00199-3