ASAP 2400 Micropore Data Reduction

Product Bulletin Number 46

ASAP 2400 Micropore Data Reduction

With the release of the ASAP 2400 Micropore Data Reduction Program (MIC P/N: 240-33008-00), Micromeritics introduces practical software for the investigation of micropores. The program conveniently imports ASAP 2400 data files, performs micropore data reduction on those files, and then prints reports according to your specifications.

From 1 to 400 data files can be imported at a time. Once imported, the data files can be edited. Sample information as well as report parameters can be revised. In most cases, the micropore data reduction is completed within a few minutes for each file.

CHOOSE FROM FOUR TYPES OF DATA REDUCTION

This program also lets you choose from four different types of data reduction techniques, giving you the ability to explore all available options. Choice of techniques include the Horvath-Kawazoe technique, the Dubinin technique (both Astakhov and Radushkevich Models), the MP-Method, and the deBoer t-Plot Method. To be thorough, you may want to consider choosing several techniques and comparing the results.

All four data reduction techniques evaluate micropore diameters ranging from 3.5 to 30 Angstroms (0.35 to 3.0 nanometers) and determine micropore volumes as well as size distributions. Types of materials commonly analyzed include microporous carbons, zeolites, silicas, aluminas and many others.

OBSERVE SMALL DIFFERENCES

The ASAP 2400 Micropore Data Reduction Program reports small changes in pore sizes. Specifically, the Horvath-Kawazoe technique resolves or plots individual peaks for different pore sizes even if the difference between one pore size and the next is only one Angstrom (0.10 nm) or less.

The ASAP 2400 does not support the acquisition of data below about 1 mmHg (133 Pa), however data points in this range can be manually entered into the program and full data reduction performed. In fact, data obtained from isotherms in the literature or from other gas sorption instruments (including Micromeritics' Model 2500, 2600, and 2800 analyzers) can be manually entered and full data reduction performed.

The micropore program is compatible with many types of analysis gas. ASAP 2400 data obtained using Argon, Nitrogen, Carbon Dioxide and almost any other type of analysis gas can be imported into the micropore program and the data reduction performed accurately.

ASAP 2400 MICROPORE DATA REDUCTION SPECIFICATIONS

Analysis Techniques:

Horvath-Kawazoe(#1)

Dubinin(#2) (both Radushkevich and Astakov Models)

deBoer t-Plot Method(#3)

MP-Method(#4)

BET Surface Area(#5)

Langmuir Surface Area(#6)

Types of Analyses:

Micropore Distributions

Micropore Size

Micropore Volume

Micropore Surface Area

Adsorption Isotherms

Data Presentation:

Tabular Data:

Pore Diameters

Differential Pore Volumes

Cumulative Pore Volumes

Incremental Pore Areas

Statistical Thickness (t)

(A full report consists of Tabular Data, Plots, and a Summary Data Page. Plots can be generated by either a printer or pen plotter.)

Types of Plots:

Pore Volume vs. Pore Diameter

Pore Volume vs. Pore Hydraulic Radius*

Langmuir Transformation vs. P/Po

BET Transformation vs. P/Po

Volume Adsorbed vs. P/Po

Volume Adsorbed vs. t(Harkins & Jura)(#7)

Volume Adsorbed vs. t(Halsey(#8)

*Pore hydraulic radius is defined as pore volume divided by pore area; see referece #4.

References

1. Horvath, G. and Kawazoe, K., J. Chem. Eng. Japan 16(6), 470 (1983).
2. Dubinin, M., Carbon 21 , 359 (1983); Dubinin, M., Progress in Surface and Membrane Science 9 , 1, Academic Press, New York (1975); Dubinin, M. and Astakhov, V., Adv. Chem. Ser. 102 , 69 (1971); Lamond, T. and Marsh, H., Carbon 1 , 281, 293 (1964); Medek, J., Fuel 56 , 131 (1977); Polanyi, M., Trans. Faraday Soc. 28 , 316 (1932); Radushkevich, L., Zh. fiz. Kemi. 33 , 2202 (1949); Stoeckli, H., et al, Carbon 27 , 125 (1989).
3. deBoer, J.H., et al, J. Catalysis 3 , 32, 38, 44, 268 (1964); J. Catalysis 4 , 319, 643, 649 (1965); Cranston, R., and Inkley, F., Adv. Catalysis 9 , 143 (1957).
4. Mikhail, R., Brunauer, S. and Bodor, E., J. Colloid and Interface Sci. 24, 45 (1968).
5. Brunauer, S., Emmett, P.H., and Teller, E., J. Am. Chem. Soc. 60, 309 (1938).
6. Langmuir, I., J. Am. Chem. Soc. 38 , 2267 (1916); J. Am. Chem. Soc. 40, 1361 (1918); Phys. Rev. 8 , 149 (1916).
7. Harkins, W.D., and Jura, G., J. Chem. Phys. 11 , 431 (1943).
8. Halsey, G., J. Chem. Phys. 16 , 931 (1948).