Adsorptionsisothermen von n‐Pentan, n‐Hexan, Benzol und Stickstoff werden am Zeolith NaY und an einem Molekularsieb, das zu 99% aus SiO2 besteht (US‐Ex), gemessen. Es zeigt sich, daß US‐Ex bidispers ist. Als Ergebnis der Dealuminierung entsteht ein Sekundärporen‐system mit Porenradien im Bereich von 1,5–1,9 nm. Mikro‐ und Sekundärporenvolumen werden bestimmt. Das Mikroporenvolumen von US‐Ex beträgt 75% bezogen auf NaY. Der Mechanismus der Dealuminierungsreaktion wird diskutiert.
The relative adsorption deformaiion of several microporous carbon adsorbents was studied as a function of the benzene adsorption at relative pressure ranging from 1 9 10 -I to 1.0 and at 293 K. A correlation between the maximum compression of the sample and the characteristic energy of benzene adsorption of the Dubinin--Radushkevich equation was obtained. Using data on the adsorption deformation, it is possible to identify the region with a specific pore size that cannot be evaluated with the help of the Dubinin--Radushkevich equation.
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