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Measurement of O2-N2 binary sorption on 5A zeolite by isotope tracer and perturbation chromatography

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Abstract

Isotope tracer chromatography allows to extract simply and quickly multi component adsorption data and is demonstrated for single component and binary adsorption equilibria for O2 and N2 on 5A zeolite as an example. In this modification of conventional tracer chromatography, a small pulse of an isotope tracer is injected in an adsorbable carrier gas (pure or multicomponent mixture) flowing through a column filled with adsorbent and is designed to operate at almost uniform pressure. Isotherm parameters are readily extracted by fitting measurements of residence times at various pressures and carrier composition. The isotherms were in excellent agreement with volumetric measurements. Isotope tracer chromatography is shown to be superior to perturbation chromatography since the influence of the injection volume on the carrier gas composition is substantially smaller for tracer experiments. Unfortunately, this new improved gas chromatographic technique requires rather expensive isotopes. The strength of this new approach lies in the advantage of working with small adsorbent samples (1 g) making a rapid screening of newly developed materials possible.

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Abbreviations

K exp,tr,i :

experimental tracer adsorption constant (mol/kg pure adsorbent/Pa)

K i :

Henry adsorption equilibrium constant (mol/kg pure adsorbent/Pa)

K i,part :

partition coefficient

K pert :

composite Henry constant (mol/kg pure adsorbent/Pa)

L :

column length (m)

L i :

Langmuir adsorption constant (1/Pa)

n i :

amount adsorbed on the solid (mol/kg adsorbent)

N i :

adsorbent loading (Pa)

p :

total pressure (Pa)

p i :

partial pressure of component i (Pa)

p in :

column inlet pressure (Pa)

p out :

column outlet pressure (Pa)

q i :

amount of component i in the micropores (Pa)

R :

gas constant (J/mol/K)

t :

time (s)

T :

temperature (K)

v f :

superficial velocity in adsorbent column (m/s)

v out :

velocity at the outlet of the column (m/s)

V′ inlet :

volumetric flow rate at inlet conditions (ml/s)

x :

molar fraction of tracer

y :

molar fraction of component i in the carrier gas

z :

axial coordinate (m)

ɛext :

bed voidage, external porosity

ɛmacr :

macropore porosity [ɛmacr=ɛ p (1−ɛext)]

ɛmicr :

micropore porosity

ɛtot :

total porosity

ɛ p :

pellet porosity

ϕ:

volume fraction of binder material

μ d :

dead time (s)

μtracer :

tracer residence time (s)

μpert :

perturbation residence time (s)

ρcrys :

crystal density (kg/m3)

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Authors and Affiliations

  1. Department Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussels, Belgium

    M. Van De Voorde, H. Verelst & G. V. Baron

Authors
  1. M. Van De Voorde
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  2. H. Verelst
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  3. G. V. Baron
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Van De Voorde, M., Verelst, H. & Baron, G.V. Measurement of O2-N2 binary sorption on 5A zeolite by isotope tracer and perturbation chromatography. J Porous Mater 2, 51–57 (1995). https://doi.org/10.1007/BF00486570

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