Micromeritics GEMINI VII KEYPAD Operator's Manual page 78

3 Command Prompts
Report Options (continued)
Option
Magee-STSA
1 )
Magee, Ricky, Columbian Chemicals Company (personal communications).
2 )
Marvin F.L. Johnson, "Estimation of the Zeolite Content of a Catalyst from Nitrogen Adsorption
Isotherms," Journal of Catalysis 52, 425-431 (1978).
3 - 26
Description
1 )
The Magee-STSA equation has three editable parameters:
Parameter
1
2
3
Enter the minimum thickness for points to be used in t-method
calculations.
Range: 0.0 to 99.99 angstroms
Default: 3.5 A
Enter the maximum thickness for points to be used in t- method
calculations.
Range: Minimum thickness to 99.99 angstroms
Default: 5.0 A
2 )
Johnson recommends a surface area correction factor of F = 0.975
for oxide-type catalysts to get the BET area and external surface area to
agree in the absence of zeolite.
Enter the surface area correction factor to be used in t-method
Range
0.0001 to 9999.00
0.0001 to 9999.00
0.0001 to 9999.00
Gemini VII Keypad Operator Manual
239-42801-01 (Rev E) — July 2021
Default
0.88
6.45
2.98