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Microcalorimetric investigation of water vapor adsorption on silica gel

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Abstract

Water vapor adsorption on silica gel was investigated using Tian–Calvet-type microcalorimetry. Differential heat of adsorption data was obtained. The setup of microcalorimetry was used volumetric system to determine adsorption isotherms of water vapor–silica gel. The Langmuir model was used in the interpretation of the adsorption data. The Clausius–Clapeyron diagram was also given. Effective mass diffusivity of water vapor in the silica gel particle as a function of temperature was also determined. The silica gel, which was degassed under vacuum at 10−7 mbar and 120 °C for 18 h, was found to adsorb 0.6, 0.98, 1.1, 1.4, 2, 3.5, 11, 13, and 14 wt% water vapor at 120, 110, 100, 90, 75, 60, 40, 35, and 30 °C, respectively. The diffusivities of water vapor inside the silica gel for short- and long-range periods were described using kinetics data as a function of temperature in the Arrhenius form.

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Abbreviations

b :

Langmuir constant

C ∞ :

Equilibrium concentration, kg m−3

D eff :

Effective diffusivity, m2 s−1

D 0 :

Reference diffusivity, m2 s−1

∆H st :

Heat of vaporization, kJ kg −1w

ΔH a :

Integral heat of adsorption, kJ kg−1

\( \Updelta \overline{h}^{\text{a}} \) :

Differential heat of adsorption, kJ mol−1

E :

Diffusion activation energy, J mol−1

n :

Eigen value

n a :

Amount of adsorbate mol kg−1

P :

Pressure, kPa

r p :

Radius of adsorbent granule, m

R :

Ideal gas constant, J mol−1 K−1

t :

Time, s

T :

Temperature, K

W :

Average adsorbate concentration, kgw kg −1S

W m :

Monolayer adsorption coverage, kgw kg −1S

\( \mathop {W_{\text{t}} }\limits^{ - } \) :

Average adsorption coverage at time t, kgw kg −1S

W ∞ :

Adsorbate concentration in equilibrium, kgW kg −1s

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Acknowledgements

Authors would like to thank to State Planning Organization of Turkey for their great financial supports to this project 2003K120690 (DPT-6).

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Authors and Affiliations

  1. Department of Chemical Engineering, Izmir Institute of Technology, 35430, Izmir, Turkey

    Hasan Demir & Semra Ülkü

  2. Department of Mechanical Engineering, Izmir Institute of Technology, 35430, Izmir, Turkey

    Moghtada Mobedi

  3. Department of Chemical Engineering, Osmaniye Korkut Ata University, Karacaoglan Campus, 80000, Osmaniye, Turkey

    Hasan Demir

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  1. Hasan Demir
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  2. Moghtada Mobedi
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Correspondence to Hasan Demir.

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Demir, H., Mobedi, M. & Ülkü, S. Microcalorimetric investigation of water vapor adsorption on silica gel. J Therm Anal Calorim 105, 375–382 (2011). https://doi.org/10.1007/s10973-011-1395-y

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