High-resolution adsorption analysis of pillared zeolites IPC-3PI and MCM-36

The porous structure of pillared zeolites IPC-3PI and MCM-36 and their precursors IPC-3P and MCM-22P, respectively, has been investigated by means of a high-resolution adsorption analysis. The analysis was based on argon adsorption isotherms measured at 87 K from the relative pressure of 10 −6 . The...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2014-07, Vol.43 (27), p.1558-1565
Main Authors: Zukal, Arnošt, Kub, Martin
Format: Article
Language:English
Subjects:
Adsorption
Argon
Density functional theory
Formations
Isotherms
Porosity
Precursors
Zeolites
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Summary:The porous structure of pillared zeolites IPC-3PI and MCM-36 and their precursors IPC-3P and MCM-22P, respectively, has been investigated by means of a high-resolution adsorption analysis. The analysis was based on argon adsorption isotherms measured at 87 K from the relative pressure of 10 −6 . The isotherms were processed by means of the t -plot method, which made it possible to distinguish adsorption in micropores from adsorption in mesopores. The pore size distribution was evaluated from argon isotherms using Non-Local Density Functional Theory. The obtained results have shown that the microporous structure of the MWW layers is preserved in both pillared zeolites. In contrast to precursors IPC-3P and MCM-22P, pillared samples are characterized by the formation of a porous structure belonging to the lower mesopore region. The distribution of mesopores in the zeolite IPC-3PI is broader and is shifted to larger widths in comparison with the zeolite MCM-36. The porous structure of pillared zeolites IPC-3PI and MCM-36 depends, in the lower mesopore region, on the stacking of MWW layers.
ISSN:1477-9226
1477-9234
DOI:10.1039/c4dt00389f