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Fluoride etching of mordenite and its influence on catalytic activity

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Abstract

Due to its structure and high Si/Al ratio, zeolite mordenite has high thermal and acidic stability. Mordenite-type of zeolites have been used as catalysts in many industrially important reactions such as hydrocracking, hydroisomerization, alkylation, acid-catalyzed isomerization of alkanes and aromatics, reforming. In order to overcome the problem of the limited access to the active sites, OSDA-free synthesized mordenite undergoes fluoride etching as a post-synthetic treatment. The post-synthetic treatment is performed with hydrofluoric acid in combination with ammonium fluoride. Thus, the porosity is enhanced additionally without changing considerably the Si/Al ratio of the zeolite framework. All samples have been characterized by X-ray diffraction analysis, nitrogen adsorption, scanning electron microscopy, high-resolution transmission electron microscopy and solid-state nuclear magnetic resonance spectroscopy. The catalytic activity of the samples obtained has been investigated in the reaction of m-xylene transformation. All mordenite samples having undergone post-synthetic treatment exhibit catalytic activity higher than that of the parent sample.

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Acknowledgements

The authors Yu. Kalvachev and T. Todorova acknowledge the financial support from “Program for career development of young scientists, Bulgarian Academy of Sciences’2016” (Contract No. DFNP 182).

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Authors and Affiliations

  1. Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev St., bl. 107, 1113, Sofia, Bulgaria

    Yuri Kalvachev, Totka Todorova & Diana Nihtianova

  2. Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

    Hristina Lazarova & Margarita Popova

Authors
  1. Yuri Kalvachev
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  2. Totka Todorova
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  3. Diana Nihtianova
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  4. Hristina Lazarova
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  5. Margarita Popova
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Corresponding author

Correspondence to Yuri Kalvachev.

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Kalvachev, Y., Todorova, T., Nihtianova, D. et al. Fluoride etching of mordenite and its influence on catalytic activity. J Mater Sci 52, 5297–5308 (2017). https://doi.org/10.1007/s10853-017-0769-3

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  • DOI: https://doi.org/10.1007/s10853-017-0769-3

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