STRUCTURAL FEATURES OF MIXED La–Al OXIDES AND THEIR CATALYTIC PROPERTIES IN THE METHANE OXIDATION PROCESS

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Abstract

The influence of the synthesis method and pretreatment on the structural features of mixed lanthanum–aluminum oxide samples with a fixed atomic ratio of La:Al = 1:1 and on their catalytic properties in methane oxidation has been investigated. The use of organic substances (filter paper or starch) as structuring agents during synthesis, treatment in aqueous or aqueous–ammonia fluids combined with high–temperature processing at different stages makes it possible to vary the phase composition, structural characteristics, and morphology of the resulting systems. It is shown that no direct correlations exist between the structural characteristics, morphology, and catalytic properties of La–Al oxides. It is suggested that the efficiency of the systems in methane oxidation is determined exclusively by the type and concentration of point defects–primarily by the state of surface oxygen anions. At the same time, the phase composition and morphology influence the number and type of active sites and their accessibility to reactants.

About the authors

P. R Vasyutin

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: mysinev@yandex.ru
Moscow, Russia

M. Yu Sinev

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Author for correspondence.
Email: mysinev@yandex.ru
Moscow, Russia

Yu. A Gordienko

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: mysinev@yandex.ru
Moscow, Russia

E. Yu Lyubimov

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: mysinev@yandex.ru
Moscow, Russia

E. A Lagunova

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: mysinev@yandex.ru
Moscow, Russia

Yu. D Ivakin

Lomonosov Moscow State University, Department of Chemistry

Email: mysinev@yandex.ru
Moscow, Russia

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