SEM study of the surface morphology and chemical composition of the MgAl- and MgGa-layered hydroxides in different steps of platinum catalysts Pt/Mg(Al, Ga)Ox synthesis

L.N. Stepanova, O.B. Belskaya, A.N. Salanov, A.N. Serkova, V.A. Likholobov

Index: 10.1016/j.clay.2018.03.003

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Abstract

The surface morphology and chemical composition of the MgAl- and MgGa-layered hydroxides as supports precursors were studied by SEM and EDX in all steps of the platinum catalysts Pt/Mg(Ga, Al)Ox synthesis. The study revealed a higher structural stability of Ga-containing samples in comparison with Al-containing analogs, which shows up as their morphological invariability during calcination, activation of layered double hydroxides, and anchoring of the metal complex. A similar Mg/M3+ ratio of metals estimated by both the volumetric method and EDX confirms that a uniform distribution of metals in the support is retained during the catalyst synthesis; this will ensure the specified adsorption and acid-base properties of Pt/MgAlOx and Pt/MgGaOx, which are the promising catalytic systems for dehydrogenation of light and higher alkanes.