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• W2005057152 abstract "A series of MgAl hydrotalcites (HTs) were synthesized by a sol−gel procedure with ethanol, 2-propanol, and 1-butanol as solvents. Particular attention was paid to controlling hydrolysis reactions by means of using a substoichiometric H2O/Al molar ratio equal to 1. The sol−gel HTs were characterized by means of thermogravimetry, mass spectrometry (MS) of the decomposition products, X-ray diffraction, diffuse reflectance infrared spectroscopy (DRIFT), electron microscopy, and N2 adsorption−desorption. Decomposition products of sol−gel HTs were identified by MS and included, among others, CxHy fragments from alkoxy groups, which were partially withdrawn between 250 and 450 °C. Alkoxy groups, from the alcohols employed as solvents, are probably intercalated within the HT layers, as indicated by XRD and DRIFT analyses. CxHy groups in these alkoxy groups were detected by DRIFT at ∼2945 and ∼2831 cm-1 in dried HTs, even after annealing at 500 °C. The HTs obtained by the sol−gel procedure described in this work showed nanocapsular morphology. Transmission electron microscopy and Rietveld refinement techniques evidenced the curvature of the HT layers. In comparison with coprecipitated MgAl−CO3 HT particles (>10 μm), sol−gel HTs showed very small particle aggregates (ca. 300∼350 nm). Calcined HTs presented specific surface area and pore volume values between 254∼332 m2/g and 0.81∼1.39 cm3/g, respectively, depending on the alcohol used in the sol−gel procedure." @default.
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• W2005057152 date "2006-12-14" @default.
• W2005057152 modified "2023-10-01" @default.
• W2005057152 title "Preparation and Characterization of Sol−Gel MgAl Hydrotalcites with Nanocapsular Morphology" @default.
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• W2005057152 doi "https://doi.org/10.1021/jp065283h" @default.
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