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Liquid-phase adsorption experiments on ordered mesoporous silicas

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Abstract

SBA-15, SBA-16 and MCM-48 silicas with hexagonal \(p\bar{6}mm\) , cubic \(Im\bar{3}m\) and cubic \(Ia\bar{3}d\) mesopore structure were synthesized according to known methods reported in literature and characterized by X-ray diffraction and nitrogen adsorption. Liquid-phase adsorption experiments were performed on all three materials. The adsorption behavior of binary liquid model mixtures was studied over the whole concentration range with regard to the separation quality of the solid and the dependence on the chain length of adsorptive molecules. Inverted U-shape isotherms were found indicating that the silicas are highly selective for polar components. So far, an influence of mesopore size or structure on liquid excess isotherms cannot be extracted from the measured data. The present work is a first step to create a data base of liquid-phase adsorption on solids with ordered mesopore structure.

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Abbreviations

Γ (n) i :

adsorption excess of component i, related to the mass of solid (mmol/g) or to the BET specific surface area of solid (μmol/m2) or to the total pore volume of solid (mmol/cm3)

n σ(n)2 :

excess amount of component 2, mmol

n 0 :

total amount of component 1 and 2 in the original mixture, mmol

x 02 :

mole fraction of component 2 before adsorption

x 2 :

mole fraction of component 2 in adsorption equilibrium

m A :

mass of adsorbent, g

Γ s2 ,h 1,U 1,U 2 :

parameters of the Bi-Langmuir function (Bräuer et al. 2002)

T :

temperature, K

R :

gas constant, 8.314472 J/(mol K)

S BET :

BET specific surface area, m2/g

V t :

total pore volume, cm3/g

V mi :

micropore volume, cm3/g

d me :

average mesopore diameter, Å

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Authors and Affiliations

  1. Wilhelm Ostwald Institute of Physical and Theoretical Chemistry, University of Leipzig, 2 Linnéstrasse, 04103, Leipzig, Germany

    R. Rockmann

  2. Institute of Experimental Physics I, University of Leipzig, 5 Linnéstrasse, 04103, Leipzig, Germany

    G. Kalies

  3. Institute of Technical Chemistry, University of Leipzig, 3 Linnéstrasse, 04103, Leipzig, Germany

    O. Klepel

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  1. R. Rockmann
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  2. G. Kalies
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  3. O. Klepel
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Correspondence to G. Kalies.

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Rockmann, R., Kalies, G. & Klepel, O. Liquid-phase adsorption experiments on ordered mesoporous silicas. Adsorption 13, 515–522 (2007). https://doi.org/10.1007/s10450-007-9063-z

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  • DOI: https://doi.org/10.1007/s10450-007-9063-z

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