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- W16147002 abstract "Sorption isotherms are routinely acquired for surface area and porosity measurements, but often have a minimum number of sample points to facilitate quick determinations. When more detailed analysis is required for accurate determinations, to measure kinetics or to compare to new theories, more care is needed to reduce errors and to increase acquisition points. The gravimetric method has the versatility that it measures directly the mass, pressure, and temperature all independently and has direct accountability, that is, not dependent upon previous measurements (compared to the volumetric method). The need for more data points necessitates computer control of the data acquisition. For this purpose, a high-vacuum microbalance was designed and interfaced with an LSI 11/23 minicomputer. All aspects of the data acquisition are controlled by the computer, including pressure settings, mass readings and storage, and temperature control (and filling the bath, if required). The system was tested by initially acquiring sorption isotherms for a commercially available silica supported alumina catalyst, A6S. Nitrogen and argon were used as adsorbates, using both gases in condensed form for the sample bath. Although nitrogen at 77/sup 0/K has become the favored standard, argon at 88/sup 0/K would seem to have some advantages, particularly being monoatomicmore » and having a smaller quadrupole dipole. Other comparisons are given, and the merits of the automated high-vacuum microbalance become quite evident when nonroutine, detailed exploratory studies are required.« less" @default.
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- W16147002 date "1986-08-29" @default.
- W16147002 modified "2023-09-26" @default.
- W16147002 title "Accurate sorption isotherm acquisition by computer-aided gravimetric methods" @default.
- W16147002 hasPublicationYear "1986" @default.
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