Authors: I.Y. Petrov, B.G. Tryasunov

Title of the article: Formation of phase composition and thermal stability of (Na₂O)-Cr₂O₃-MoO₃/-Al₂O₃- catalysts

Year: 2012, Issue: 5, Pages: 94-106

Branch of knowledge: Chemical technology

Index UDK: (541.18.02+541.128.36):542.973

DOI: -

Abstract: Using thermal and X-Ray diffracton analyses, the processes of phase and structure formation in (0-25%)Cr₂O3-(0-25%)MoO₃/γ-Al₂O₃ catalysts (undoped and doped with 2 wt.% Na₂O) during their thermal treatment in air have been studied. The samples were subjected to thermal treatment in both temperature-programmed (20-1000°C, 10°C/min) and fixed-temperature (600, 800 and 1000°C, 6 h) regimes of heating. Cr₂O₃ added to molybdena-alumina systems has been shown to suppress mineralizing action of MoO₃ on the phase composition of Al₂O₃ [as a result of generating more refractory Cr₂(MoO₄)3 and/or CrxAl₂-x(MoO₄)₃ phases] and to stabilize the spinel lattice structure of alumina support (due to the for-mation of Cr₂O₃-Al₂O₃ solid solutions on the base of aluminum oxide).

Key words: thermal treatment Cr₂O₃-MoO₃/γ-Al₂O₃-catalysts phase composition aluminum and chromium molybdates

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