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Structural and Acidic Properties of Ion-Exchanged Mazzite

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Abstract

A range of modified MAZ and LTL zeolites have been prepared and ion-exchanged with a series of alkali metal cations. It has been shown that K, Rb and Cs can be readily introduced into the MAZ structure with ~2 cations ion-exchanged per unit cell. In contrast, less than one cation of Li or Na per unit cell has been introduced under similar conditions. Ion-exchanged zeolites have been characterised using Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, X-ray fluorescence and N2 physisorption in order to gain a better understanding of their structural and acidic properties. The FTIR data indicate considerable heterogeneity of the bridging OH groups in mazzite. The concentration of both Brønsted and Lewis acid sites detected in MAZ using pyridine as a probe molecule is lower than expected from its chemical composition, with the relative accessibility of the bridging OH-groups varying from 16% for H-MAZ to 28% for K-exchanged samples. This is in agreement with the N2 adsorption-desorption data showing a rather low micropore volume for the ion-exchanged materials and with the NH3-TPD results implying considerable transport limitations. This work demonstrates that the channel structure of mazzite is partially blocked resulting in a decreased micropore volume and limited access to the acid sites.

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Funding

A.A-A thanks the Ministry of Oil, Oil Marketing Company (SOMO, Baghdad, Iraq) for the funding provided under the grant SL-144-04B. A.C. and M.J. express their gratitude to the Keele postgraduate fund for financing the attendance fee at the ICDD X-ray diffraction workshop, which supported this research. The authors acknowledge MSc students Michael Moore and Byron Ross for their contributions. The authors also gratefully acknowledge our colleagues at Keele University for their helpful feedback, and Johnson Matthey PLC for the provision of a mazzite sample. M.J. thanks the Royal Society (grant IES/R3/203138), and the Newton Fund for part-funding his Ph.D. project. VZ thanks the Russian Science Foundation for the financial support (grant № 23-73-0005, https://rscf.ru/project/23-73-00005/).

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Authors and Affiliations

  1. School of Chemical and Physical Sciences, Keele University, ST55BG, Keele, UK

    Alessandro Contini, Martin Jendrlin, Aqeel Al-Ani & Vladimir Zholobenko

  2. Johnson Matthey Plc, Billingham, TS231LB, Stockton-on-Tees, UK

    Martin Jendrlin

  3. Oil Marketing Company (SOMO), 10091, Baghdad, Iraq

    Aqeel Al-Ani

  4. Department of Chemistry, Moscow State University, 119991, Moscow, Russia

    Vladimir Zholobenko

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  1. Alessandro Contini
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  2. Martin Jendrlin
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Correspondence to Alessandro Contini or Vladimir Zholobenko.

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Contini, A., Jendrlin, M., Al-Ani, A. et al. Structural and Acidic Properties of Ion-Exchanged Mazzite. Pet. Chem. (2024). https://doi.org/10.1134/S0965544123110099

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