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

Author: Timofeeva M.   Ayupov A.   Volodin A.   Pak Yu.   Volkova G.   Echevskii G.  

Publisher: MAIK Nauka/Interperiodica

ISSN: 0023-1584

Source: Kinetics and Catalysis, Vol.46, Iss.1, 2005-01, pp. : 123-127

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Abstract

The surface acidity of H3PW12O40 and NaxH3−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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