2021, №3

сс. 73-90

Structuring and Phase Formation During the Treatment of La/Al2O3 Catalyst Precursors in Water Fluids

2021, №3

сс. 73-90

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P.R. Vasyutin, E.A. Lagunova, M.Yu. Sinev, Yu.D. Ivakin, Yu.A. Gordienko, D.P. Shashkin

Key words: aluminum oxide, lanthanum oxide, water fluid, hydration, lanthanum aluminate, morphology

The effect of the synthesis method on the formation of the structure and composition of
materials composed of porous alumina supported lanthanum oxide, has been studied. The
effect of the morphology of porous aluminum oxide (α-modification) on the formation
of various compounds (oxide La2O3 and aluminates LaAlO3 and La10Al4O21) during
thermal treatment of a support impregnated with a solution of lanthanum nitrate is
shown. It was found that when systems are treated in a water fluid, the processes of
structuring and phase formation proceed at a much lower temperature and more intensively
than under thermal action, which is due to the high mobility of structural elements in a
hydrated state. It is shown that the formation of LaAlO3 aluminate is limited by the
hydration of the initial aluminum oxide, which proceeds more intensively in the case of
its γ-modification. Varying the sequence and conditions of the stages of treatment in a
water fluid and thermal action makes it possible to obtain composites of various
morphologies and containing various single and complex oxide compounds and phases.