Abstract
The adsorption uptake curves of CO2, CO, N2 and CH4 on zeolite LiX and activated carbon were measured using a volumetric method at 293, 308 and 323 K and pressure up to 100 kPa. The experimental uptake curves were correlated with a non-isothermal kinetic model because the adsorption kinetics was controlled by heat generation and transfer, and an isothermal model showed large deviation from experimental uptake. The adsorption rates of the gases on zeolite LiX and activated carbon were affected by the isosteric heat of adsorption, heat transfer rate and adsorption affinity. At the same pressure and temperature, the sequence of effective diffusion time constants was CO2 ≪ CO < N2 < CH4 for zeolite LiX and CO2 ≪ CH4 ≤ N2 < CO for activated carbon. The adsorption rate of CO showed the largest difference between the two adsorbents. Effective diffusion time constants (D/R2) for all cases were provided, which depended on pressure and temperature.
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Abbreviations
- a:
-
External surface area divided by the volume of the adsorbent (m−1)
- cp :
-
Concentration in the particle (mol kg−1)
- Cs :
-
Heat capacity of the sample (J g−1 K−1)
- D/R2 :
-
Effective diffusion time constant (s−1)
- D:
-
Diffusivity (m2 s−1)
- Dc/rc :
-
Micropore diffusion time constant (s−1)
- Dp/Rp :
-
Effective macropore diffusion time constant (s−1)
- h:
-
Overall heat transfer coefficient (J m−1 s−1 K−1)
- K:
-
Henry constant (–)
- P:
-
Pressure (kPa)
- Q:
-
Adsorbed amount (mol kg−1)
- Qst :
-
Isosteric heat of adsorption (kJ mol−1)
- R:
-
Ideal gas constant (J mol−1 K−1)
- R2 :
-
Coefficient of determination (R2) (–)
- T:
-
Time (s)
- T:
-
Temperature (K)
- Vg :
-
Volume occupied by the gas (m3)
- Vs :
-
Volume occupied by the adsorbent (m3)
- α:
-
Dimensionless parameter defined by non-isothermal model (–)
- β:
-
Dimensionless parameter defined by non-isothermal model (–)
- ρs :
-
Density of the adsorbent (g m−3)
- 0:
-
Initial state
- ∞:
-
Equilibrium state
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We would like to acknowledge the financial support from the R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning) and NST (National Research Council of Science & Technology) of Republic of Korea (CRC-14-1-KRICT).
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Ju, Y., Park, Y., Park, D. et al. Adsorption kinetics of CO2, CO, N2 and CH4 on zeolite LiX pellet and activated carbon granule. Adsorption 21, 419–432 (2015). https://doi.org/10.1007/s10450-015-9683-7
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DOI: https://doi.org/10.1007/s10450-015-9683-7