Influence of a doubly charged cation nature on the formation and properties of mixed oxides MAlO x (M = Mg2+, Zn2+, Ni2+) obtained from the layered hydroxide precursors

Zinc influence on the formation and properties of Pt/Mg(Zn)AlO catalysts synthesized from layered hydroxides

“…In order to obtain the oxide phase, the samples were calcined at 823 K. Such conditions provide a complete destruction of the LDH layered structure [40] with the removal of interlayer water and charge compensating anions. The diffraction patterns of the magnesium-aluminum sample and the samples containing a minimum amount of zinc (Fig.…”

“…The defect wurtzite-like oxide, similar to the layered defect spinel in the case of magnesium-containing samples, can be hydrated in water with restoration of the hydrotalcite structure (the memory effect) [40]. However, a part of zinc is not embedded in restoration, and the fraction of zinc oxide in the activated Mg(Zn)Al-OH samples increases in comparison with the initial Mg(Zn)Al-CO 3 samples.…”

“…The synthesis of the layered hydroxides having different composition and carbonate counter ions was described in detail in [1][2][3][4][5][13][14][15]40]. The synthesis procedure included coprecipitation of Mg 2+ , Zn 2+ and Al 3+ hydroxides from aqueous solutions (1 mol/L) of nitrate salts upon their interaction with the solutions containing carbonate and hydroxide ions (1 mol/L).…”

“…The effect of the features of a bivalent metal on the structural and textural characteristics of LDH and the corresponding mixed oxides was studied in our earlier work [40]. It was shown that the structure and properties of zinc-containing LDH are close to those of magnesium-aluminum system, and these LDH can form the oxide phase with a developed surface area.…”

Mechanochemically synthesized LiAlOx catalyst for aqueous aldol condensation of furfural with acetone

“…The Mg 2+ to Al 3+ molar ratio in the salt solution was maintained constant and equal to 3 and 4. The synthesis was carried out at pH 10 and a temperature of 333 K. Further experimental details are given in [49,50]. The resulting precipitates of MgAl-LDHs contained carbonate anions in the interlayer space.…”