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Adsorption

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13-03-2019

Nitrogen adsorption at ca. 77.4 K on partially hydrated and anhydrous α-Al₂O₃

Authors: Maxim S. Mel’gunov, Artem B. Ayupov, Elena A. Krapivina, Elena A. Mel’gunova

Published in: Adsorption | Issue 3/2019

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Abstract

N₂ adsorption isotherms at ca. 77 K on macroporous α-Al₂O₃ have been measured and analyzed in the frameworks of the classic thermodynamic approach, with independent experimental data obtained by means of SEM-EDX, XRD, TGA, helium pycnometry, and mercury porosimetry taken into account. It is shown, that presence of adsorbed water considerably influences N₂ adsorption, which gradually increases with temperature of the degas treatment. Simultaneously, the shape of the isotherms has a trend to change from Type II to Type VI, that assumes changing of adsorption mechanism from progressive increasing of the adsorbed layer thickness towards layer-by-layer adsorption. Corrected and smoothed isotherms are presented in the tabular form as reference for subsequent more comprehensive analysis using molecular statistical approaches.

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Title: Nitrogen adsorption at ca. 77.4 K on partially hydrated and anhydrous α-Al2O3
Authors: Maxim S. Mel’gunov
Artem B. Ayupov
Elena A. Krapivina
Elena A. Mel’gunova
Publication date: 13-03-2019
Publisher: Springer US
Published in: Adsorption / Issue 3/2019
Print ISSN: 0929-5607
Electronic ISSN: 1572-8757
DOI: https://doi.org/10.1007/s10450-019-00055-z

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