Preparation and Characterization of High Surface Area Al2O3-MgAl2O4 Solid Solutions

Degradation of Methyl Paraoxon in the Presence of Mg2+-Al3+ Mixed Oxides

“…The identification was achieved by comparing the diffraction patterns with the standard peaks from CRYSMET Database (see Supporting Information, Figures S5 and S6). The spectrum (c) obtained for catalyst 4 is consistent with the formation of an incipient MgAl 2 O 4 spinel phase, where the peaks coincide with the standard peaks for the MgAl 2 O 4 described in American Mineralogist Crystal Structure Database (code amsd 0001398), see bottom of Figure . Defining MgAl 2 O 4 as a spinel phase, indicates that the sample is a ternary oxide with a chemical formula of AB 2 O 4 , where A is a divalent metallic cation at a tetrahedral site and B is a trivalent metallic cation at an octahedral site of the cubic structure .…”

“…The identification was achieved by comparing the diffraction patterns with the standard peaks from CRYSMET Database (see Supporting Information, Figures S5 and S6). The spectrum (c) obtained for catalyst 4 is consistent with the formation of an incipient MgAl 2 O 4 spinel phase, 39 where the peaks coincide with the standard peaks for the MgAl 2 O 4 described in American Mineralogist Crystal Structure Database (code amsd 0001398), 40 The effects of calcination at different temperatures of sample 4, with 31.8% (w/w) concentration of MgO, which presented the incipient spinel phase, were also examined using powder XRD, and the results are shown in Figure 2. As can be seen, the incipient MgAl 2 O 4 spinel phase still exists for calcination temperatures until 650 °C, spectra (a−c).…”

Mesoporous spinel MgAl2O4 prepared by in situ modification of boehmite sol particle surface: I Synthesis and characterization of the unsupported membranes

“…In their work Mg(Al(OR) 4 ) 2 is used as the precursor to prepare sol. The synthesis process of the double metal alkoxides is somewhat dangerous because HgCl 2 is used as the catalyst to facilitate the dissolution of aluminum and magnesium metals [4][5][6] and mercury dissolves out after the reaction [7]. As an irresistible trend to develop environment friendly processes in the chemical industry, any contaminative chemicals like mercury should be avoided.…”

“…This is expected to be one of the goals for the sol-gel process to synthesize materials at low temperatures [22]. Arean et al [7] detected the incipient spinel phase at 500°C in sol-gel process. Profile (a) in Fig.…”