Diffusion of phenolic compounds within high-silica MFI-type zeolite in the mesitylene solution

The intracrystalline diffusivity of phenolic compounds (phenol, p-propylphenol and m-cresol) and toluene within silicalite-1 and MFI-type zeolite with Si/Al = 303 (H-MFI) in the liquid phase (solvent: mesitylene) in the temperature range from 313 to 353 K were measured by using the constant volumetr...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2021-05, Vol.319, p.111044, Article 111044
Main Authors: Su, Xinluona, Nakasaka, Yuta, Moriwaki, Ren, Yoshikawa, Takuya, Masuda, Takao
Format: Article
Language:English
Subjects:
Adsorption
Diffusion
Liquid phase
MFI-type zeolite
Phenolic compounds
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Summary:The intracrystalline diffusivity of phenolic compounds (phenol, p-propylphenol and m-cresol) and toluene within silicalite-1 and MFI-type zeolite with Si/Al = 303 (H-MFI) in the liquid phase (solvent: mesitylene) in the temperature range from 313 to 353 K were measured by using the constant volumetric method. The amounts of phenol, p-propylphenol, and toluene adsorbed onto silicalite-1 at 313, 323 and 353 K were approximately the same, whereas less m-cresol was adsorbed because of its larger kinetic diameter. Unlike adsorbed toluene, adsorbed of phenol displayed stronger interactions in H-MFI than in silicalite-1, indicating that hydrogen bonding between the OH group of phenol and Brønsted acid sites in H-MFI enhanced the adsorption of phenol. Whereas the intracrystalline diffusivity of phenol, p-propylphenol, and toluene within silicalite-1 are approximately the same, m-cresol exhibited lower intracrystalline diffusivity, indicating that the intracrystalline diffusivity was governed by geometrical limitation. The intracrystalline diffusivity of phenol was lower within H-MFI with acid sites than within silicalite-1. The residence time of phenol on the acid sites became longer than that of toluene, which led to a difference in the intracrystalline diffusivity between phenol and toluene within H-MFI. [Display omitted] ●Diffusion of phenolic compounds within MFI-type zeolite was measured.●Diffusivity of phenolic compounds in slicalite-1 depends on their kinetic diameter.●Hydroxy group in phenols strongly adsorbed on acid site effect their diffusivity.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2021.111044