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Surface acid sites of H3PW12O40 as studied by the adsorption of stable nitroxyl radicals

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Abstract

The surface acidity of H3PW12O40 and Na x H3−xPW12O40 (x = 1–3) was studied using the adsorption of 2,2′,6,6′-tetramethyl-4-oxopiperidine-1-oxyl (TEMPON) and 2,2′,6,6′-tetramethyl-4-hydroxypiperidine-1-oxyl (TEMPOL) radicals. It was found that the amount of surface proton sites determined from the adsorption of TEMPON decreased with the degree of substitution of Na+ cations for protons. A correlation between amount of strong surface proton sites and catalytic activity of NaxH3−xPW12O40 (x = 0–3) in the dealkylation reaction of 2,6-di-tert-butyl-4-methylphenol was found.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    M. N. Timofeeva, A. B. Ayupov, A. M. Volodin, G. G. Volkova & G. V. Echevskii

  2. Novosibirsk State University, 630090, Novosibirsk, Russia

    Yu. R. Pak

Authors
  1. M. N. Timofeeva
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  2. A. B. Ayupov
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  3. A. M. Volodin
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  4. Yu. R. Pak
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  5. G. G. Volkova
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  6. G. V. Echevskii
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Additional information

Translated from Kinetika i Kataliz, Vol. 46, No. 1, 2005, pp. 131–136. Original Russian Text Copyright © 2005 by Timofeeva, Ayupov, Volodin, Pak, Volkova, Echevskii.

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Timofeeva, M.N., Ayupov, A.B., Volodin, A.M. et al. Surface acid sites of H3PW12O40 as studied by the adsorption of stable nitroxyl radicals. Kinet Catal 46, 123–127 (2005). https://doi.org/10.1007/s10975-005-0061-4

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  • DOI: https://doi.org/10.1007/s10975-005-0061-4

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