Hammett Acidity Function for Mixed ZrO<sub>2</sub>–SiO<sub>2</sub> Oxide at Elevated Temperatures

Authors

  • E. I. Inshina Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine
  • D. V. Shistka Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine
  • G. M. Telbiz Pysarzhevskiy Institute of Physical Chemistry of National Academy of Sciences of Ukraine
  • V. V. Brei Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine

Abstract

The mixed ZrO2?SiO2 oxides with different 4 ? Zr/Si ? 0.25 atomic ratios have been prepared using a sol-gel method. It was shown that the concentration-strength acid site distributions on the surface of ZrO2?SiO2 are caused by Zr4+/Si4+ ratio. The ZrO2?SiO2 with Zr/Si = 0.5 is characterized by the highest strength of acid sites (Н0 = –11.35). According to the IR-spectra of adsorbed pyridine, the B- and L-acid sites are present in the ZrO2?SiO2 samples with Zr/Si<1 whereas at Zr/Si>1 only L?sites are formed. Basing on the UV-Vis diffuse reflectance spectra of adsorbed indicators, the H0 values for ZrO2?2SiO2 have been determined at elevated temperatures. The Hammett acidity function reaches the superacid value of Н0 ? –14.5 at Т ? 85 °С.

References

Pat. 2364949 United States, Int. Cl. 502/242. Conversion of hydrocarbon oils / Connolly G.C. et al. – Publ. Dec. 12, 1944.

Thomas C.L. Ind. Eng. Chem. 1949. 41. 2564. doi: 10.1021/ie50479a042

Setoyama T., Kobayashi M., Kabata Y. et al. Catal. Today. 2009. 73. 29. doi.10.1016/S0920-5861(01)00515-6

Bosman H. J. M., Kruissink E. C., van der Spoel J., van den Brink F. J. Catal. 1994. 148. 660. doi.10.1006/jcat.1994.1253

Lopez T., Navarrete J., Gomez R. et al. Appl. Catal. A. 1995. 125. 217. doi.10.1016/0926-860X(95)00022-4

Navio J.A., Marchena F.J., Macias M. et al. J. Sol-Gel Sci. Technol. 1997. 10. 165. doi 10.1023/A:1018399529744

Tarafdar A., Panda A.B., Pramanik P. Micropor. Mesopor. Mater. 2005. 84. 223.

Prudius S.V. Catalysis and Petrochemicals. 2010. 18. 1 (in Russian).

Brei V.V., Shistka D.V., Telbiz G.M. Polish J. Chem. 2008. 82. 179.

Brei V.V. Theor. Exp. Chem. 2008. 44. 320. doi 10.1007/s11237-008-9040-y

Tanabe K. Catalysts and Catalytic Processes. Moscow: Mir, 1993. (in Russian).

Downloads

How to Cite

(1)
Inshina, E. I.; Shistka, D. V.; Telbiz, G. M.; Brei, V. V. Hammett Acidity Function for Mixed ZrO<sub>2< sub>–SiO<sub>2< Sub> Oxide at Elevated Temperatures. Him. Fiz. Tehnol. Poverhni 2012, 3, 395-400.

Issue

Vol. 3 No. 4 (2012): Chemistry, Physics and Technology of Surface / Himia, Fizika ta Tehnologia Poverhni

Section

Articles

License

  1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
  2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.