Adsorption

, Volume 18, Issue 2, pp 75–86 | Cite as

Adsorption and diffusion of Xenon in a granulated nano-NaY zeolite

  • Amir Charkhi
  • Mohammad Kazemeini
  • Seyyed Javad Ahmadi
  • Sareh Ammari Allahyari
Article
First Online:
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Accepted:

Abstract

Henry’s law constant and crystal diffusivity of xenon in the granulated nano-NaY zeolite were measured by the pulse gas chromatography method. For this purpose the moments of response peaks of xenon were analyzed. The effect of extra column parts of the utilized chromatographic system was also considered by analyzing the moments of the response peak which was obtained by pulse injection of inert gas of helium into the carrier gas of nitrogen. In addition, the measurement of average velocity of the carrier gas regarding the pressure drop in the extra column parts of the system attributed to precise results. By carrying out the experiments at various temperatures in the range of 30–110 °C the heat of adsorption and activation energy of crystal diffusivity were estimated. In order to find the binder effect on the adsorption of and diffusion into granules, the aforementioned parameters were also measured for the binderless granules of macron sized NaY zeolite. Results revealed that although the adsorption of xenon on the binder of bentonite was negligible, the diffusion resistance created by this binder was significant such that the effective crystal diffusivity in the granules with 25 % binder was determined to be 96 percent lower than the granules with no binder.

Keywords

Crystal diffusivity Henry’s law constant Pulse chromatography Nano sized NaY zeolite Xenon 

Nomenclature

DAB

Molecular diffusivity (m2/s)

Dax

The axial dispersion coefficient (m2/s)

Dp

Diffusion coefficient in pores of granules (m2/s)

Dμ

The effective diffusivities (m2/s)

Dμ0

Crystal diffusivity constant (m2/s)

Eμ

The activation energy of crystal diffusivity (kJ/mol)

K

Dimensionless Henry’s law constant based upon the crystal volume

K0

Adsorption constant

Km

External mass transfer coefficient (m/s)

L

Length of packed column (m)

Q0

The heat of adsorption (kJ/mol)

R

Radius of granules (m)

Re

Reynolds number (ρV⋅2R)/μ

Rμ

Radius of zeolitic crystal (m)

Sc

Schmidt number (μ/ρD AB)

Sh

Sherwood number (K m 2R/D AB)

T

Temperature (K)

V

Superficial velocity (m/s) under non-isobaric conditions

Greek Letter

εb

The bed porosity

εp

Granule porosity

μ

Fluid viscosity (kg/m s)

μ1

The first normalized moment (s)

\(\mu_{2}'\)

The second central moment (s2)

ρ

Density (kg/m3)

σ

Standard deviation

τ

Tortuosity factor

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Amir Charkhi
    • 1
    • 2
  • Mohammad Kazemeini
    • 1
  • Seyyed Javad Ahmadi
    • 2
  • Sareh Ammari Allahyari
    • 2
  1. 1.Department of Chemical and Petroleum EngineeringSharif University of TechnologyTehranIran
  2. 2.Department of Nuclear Fuel CycleNuclear Science and Technology Research InstituteTehranIran

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