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Journal of Thermal Analysis and Calorimetry

, Volume 133, Issue 1, pp 355–364 | Cite as

Study on thermal stabilities and symmetries of chemisorbed species formed on K-zeolites upon CO2 adsorption by TPD and in situ IR spectroscopy

  • Yadolah Ganjkhanlou
  • Roman Bulánek
  • Oleg Kikhtyanin
  • Karel Frolich
Article
  • 168 Downloads

Abstract

In the current study, K-zeolites with different structure, Si/Al ratio and morphology have been prepared and then characterized by different techniques including in situ IR spectroscopy upon CO2 sorption and CO2–TPD with the aim of understanding the nature of basic sites present on their surface acting as catalytic sites in aldol condensation reaction. Results showed that depending on the zeolite structure, pore size and Si/Al ratio, two categories of basic sites could be present in potassium modified zeolites. Symmetries of chemisorbed CO2 on these sites are different and comparing the results of TPD and in situ IR spectroscopy; it can be concluded that highly symmetric species (e.g., monodentate carbonates) have higher thermal stability than low symmetric adsorbed species (e.g., bidentate carbonates). It was found that in the zeolite with relatively smaller pore size or less accessible pores (e.g., MFI), second type of adsorbed species is more popular, while highly symmetric species tend to form on large pore zeolites and on materials with some mesoporosity (e.g., BEA or dealuminated FAU zeolites). It is observed that almost all the bidentate species are desorbed at 80 °C, while monodentate species are thermally stable at least up to 130 °C. Based on combination of experimental data obtained from TPD with IR spectroscopy results, origin and assignment of the TPD peaks were discussed.

Keywords

TPD Zeolite CO2 adsorption Basic sites Potassium IR spectroscopy 

Notes

Acknowledgements

Financial support from the Czech Science Foundation for the project of the Centre of Excellence (P106/12/G015) is gratefully acknowledged.

Supplementary material

10973_2017_6811_MOESM1_ESM.docx (5.2 mb)
Supplementary material 1 (DOCX 5282 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2017

Authors and Affiliations

  1. 1.Department of Physical Chemistry, Faculty of Chemical TechnologyUniversity of PardubicePardubiceCzech Republic
  2. 2.Unipetrol Centre of Research and Education (UNICRE)Záluží-LitvínovCzech Republic
  3. 3.Technopark KralupyUniversity of Chemistry and Technology PragueKralupy nad VltavouCzech Republic

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