Temkin Isotherm - Micromeritics ASAP 2020 Confirm Operator's Manual

Appendix C

Temkin Isotherm

The Temkin isotherm has the form,
Q
----- -
Q
S
where
Q
Q
S
q
0
A
0
In terms of quantity adsorbed,
Q
Thus, the plot of the natural log of absolute pressure vs. quantity adsorbed yields a straight
line with slope RTQ
202-42811-01 - Mar 2011
RT
 
-------- -
= ln A P
 0
q
0
= quantity of gas adsorbed
= quantity of gas in a monolayer
= the differential heat of adsorption at zero surface coverage
= a exp {-q
0 0
RTQ
P

S
------------- - ------ -
= ln A + ln

 0
q Po
0
/q and intercept (ln A
S 0
/RT}, where 
and a are adjustable constants
0 0


.
) RTQ /q
0 S 0
ASAP 2020 Confirm
C-39