Russian Chemical Bulletin

, Volume 44, Issue 10, pp 1827–1831 | Cite as

Active centers on the surface of thermoactivated silica. Their reactivity toward organoaluminum compounds

  • M. B. Molotovshchikova
  • V. A. Dodonov
  • G. N. Lysenko
  • S. K. Ignatov
  • A. G. Razuvaev
General and Inorganic Chemistry


Interaction between organoaluminum compounds (triethylaluminum, ethoxydiethylaluminum, and diethoxyethylaluminum) and the surface of silica activated at various temperatures (200–800 °C) was studied by IR spectroscopy, mass spectrometry, and quantum chemistry. Formation of structural silanon defects on the surface of silica activated at 800 °C was considered. It was established that the fraction of terminal silanol groups involved in the interaction with organoaluminum compounds on the surface of silica thermoactivated above 600 °C is low, and siloxane bonds and structural surface defects play a determining role. The thermodynamic favorability of coordination of organoaluminum compounds on these active surface centers is shown. The structure and routes of decomposition of aluminum-containing surface intermediates were studied.

Key words

silica surface organoaluminum compounds active surface centers intermediates clusters silanon groups terminal silanol groups 


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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • M. B. Molotovshchikova
    • 1
  • V. A. Dodonov
    • 1
  • G. N. Lysenko
    • 1
  • S. K. Ignatov
    • 1
  • A. G. Razuvaev
    • 1
  1. 1.Scientific Research Institute of Chemistry at N. I. Lobachevsky Nizhnii Novgorod State UniversityNizhnii NovgorodRussian Federation

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