Heat Of Adsorption; Summary Report - Micromeritics ASAP 2020 Confirm Operator's Manual

Appendix C

Heat of Adsorption

The adsorption isostere is represented by
 
ln
 
where
q
i
C
The isosteric heat of adsorption, q,
tion of 1/RT for a set of isotherms measured at different temperatures.

Summary Report

The following calculations and the results of previous calculations (as noted) are used to gen-
erate the summary report:
a. BET Surface Area
See BET Surface Area Calculations
b. Langmuir Surface Area
See Langmuir Surface Area Calculations
c. Single Point Surface Area (m
S
1PT
where
Pr = pressure closest to 0.3 of the relative pressure points designated for surface area
Va = volume corresponding to Pr
d. Micropore Area
See t-Plot calculations.
202-42811-01 - Mar 2011
q
P
i
----- ------ -
= + C
P RT
0
= isosteric heat of adsorption
= unknown constant
i
     CSA 
Va 1 Pr –
------------------------------------------------------------------------------------------------ -
=
3
22414 cm STP
calculations.
is determined by finding the slope of ln (P/P
2 /g)
23
   
6.023 10
18 2 2

10 nm /m
ASAP 2020 Confirm
) as a func-
0
C-43