3 Command Prompts
Option
Description
Magee-STSA
The Magee-STSA
1 )
equation has three editable parameters:
Parameter
Range
Default
1
0.0001 to 9999.00
0.88
2
0.0001 to 9999.00
6.45
3
0.0001 to 9999.00
2.98
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
Johnson
2 )
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
Report Options (continued)
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
Gemini VII Keypad Operator Manual
239-42801-01 (Rev E) — July 2021
