Journal of Materials Science

, Volume 52, Issue 9, pp 5297–5308 | Cite as

Fluoride etching of mordenite and its influence on catalytic activity

  • Yuri Kalvachev
  • Totka Todorova
  • Diana Nihtianova
  • Hristina Lazarova
  • Margarita Popova
Original Paper
First Online:
Received:
Accepted:

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.

Keywords

Zeolite Mordenite NH4F Parent Sample Ammonium Fluoride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

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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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Yuri Kalvachev
    • 1
  • Totka Todorova
    • 1
  • Diana Nihtianova
    • 1
  • Hristina Lazarova
    • 2
  • Margarita Popova
    • 2
  1. 1.Institute of Mineralogy and CrystallographyBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Institute of Organic Chemistry with Centre of PhytochemistryBulgarian Academy of SciencesSofiaBulgaria

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