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Adsorption Isotherms of Ethylene in NaX (Zeolite Structure FAU)

​
temperature in °C
0
This Demonstration plots adsorbtion versus pressure,
P
, at various temperatures for ethylene (
C
2
H
4
) in NaX, known as faujasite zeolite structure (FAU). The amount adsorbed,
n
(expressed in mol/kg), increases at low temperatures and high pressures. The adsorption isotherm, shown in red, is given by the following relation:
P(n)=
nm
K
0
(m-n)
exp
C
1
n+
C
2
2
n
+
C
3
3
n
exp
(
D
0
+
D
1
n)
R
1
T
-
1
T
0
,
where
K
0
is Henry's constant at
T=
T
0
, expressed in mol/(kg kPa),
m
is the saturation capacity, equal to 2.9997 mol/kg, and
C
i
, for
i
=1 to 3, are the virial coefficients. If these coefficients are set equal to zero, one recovers the well-known Langmuir equation (the blue curve). The term
(
D
0
+
D
1
n)
is the differential enthalpy of adsorption.
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