Niobium-containing catalysts for oxydehydrogenation of hydrocarbons and alcohols |
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| Authors: | O N Krasnobaeva I P Belomestnykh T A Nosova T A Elizarova G V Isagulyants S P Kolesnikov V P Danilov |
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| Institution: | 1.Kurnakov Institute of General and Inorganic Chemistry,Russian Academy of Sciences,Moscow,Russia;2.Zelinskii Institute of Organic Chemistry,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The first methods are developed for introducing niobium(V) into Mg-Al hydrotalcites used as precursors of oxide catalysts
for oxydehydrogenation (OD) of alkanes and alcohols. Samples of niobium(V)-containing oxide catalysts are synthesized. Their
catalytic properties are studied in oxydehydrogenation of ethane and ethylbenzene to styrene, oxidation dehydrocyclization
of octane into ethylbenzene and styrene, and oxydehydrogenation of sec-butanol to ketone (octane-(2)-one). It is ascertained
that ethane transformation into ethylene is highly a selective highly process (92–97%) at low temperatures (450–500°C) in
the presence of a niobium-containing catalyst; the catalyst is appreciably efficient in ethylbenzene transformation to styrene
and dehydrocyclization of n-octane to ethylbenzene and styrene, and in oxydehydrogenation of secbutanol to octane-(2)-one. All the catalysts studied
operate stably in OD reactions; no decrease in their activity or selectivity was detected after 50 h operation. |
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