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Journal of Structural Chemistry

2014 year, number 6

DETERMINATION OF THE PHASE COMPOSITION OF CATALYST PRECURSORS FOR MULTIWALL CARBON NANOTUBES BY THE STOICHIOGRAPHIC DIFFERENTIAL DISSOLUTION METHOD

L. S. Dovlitova1, A. A. Pochtar’1, V. V. Malakhov1,2
1Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: катализаторы синтеза МУНТ, дифференцирующее растворение, стехиографический метод, MWCNT synthesis catalysts, differential dissolution, stoichiographic method

Abstract

The standardless stoichiographic differential dissolution (DD) method is used for phase analysis of superfine multicomponent oxide precursors of Fe-Co MWCNT synthesis catalysts obtained by the Pechini method. The analysis identifies the individual phases in the studied samples of Fe 2Co/Al 2O 3, Fe 2Co/MgO, and Fe 2Co/CaCO 3 and determines their stoichiometric composition and quantitative content. It is found that the samples are a complex mixture of superfine oxide phases the composition of which corresponds to a spinel structure and may simultaneously include both active (Fe and Co) and carrier elements (Al and Mg) to form solid solutions. It is only the Fe 2Co/CaCO 3 samples that contain a carrier-free phase the composition of which corresponds to a spinel structure.