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• W2078586516 endingPage "384" @default.
• W2078586516 startingPage "375" @default.
• W2078586516 abstract "Layered double hydroxides (LDHs, or hydrotalcites) with Mg2+ and Al3+ cations in the mixed metal hydroxide layer and paratungstate anions in the interlayer have been prepared. Different methods have been followed: anion exchange with Mg,Al LDHs originally containing nitrate or adipate, reconstruction of the LDH structure from a mildly calcined Mg2Al−CO3 LDH, and coprecipitation. In all cases, the tungsten precursor salt was (NH4)10H2W12O42. The prepared solids have been characterized by elemental chemical analysis, powder X-ray diffraction (PXRD), FT-IR spectroscopy, thermogravimetric (TG) and differential thermal (DTA) analyses, scanning electron microscopy (SEM) with EDX (energy-dispersive X-ray analysis), and nitrogen adsorption at −196 °C for surface area and surface texture. Most of the synthesis methods used, especially anion exchange starting from a Mg2Al−NO3 precursor at low temperature and short reaction times, lead to formation of a hydrotalcite with a gallery height of 9.8 Å; increasing the reaction temperature to 70−100 °C and maintaining short contact times leads to a solid with a gallery height of 7.8 Å. Both phases have been identified as a result of the intercalation of W7O246- species in different orientations in the interlayer space. If the time of synthesis or the temperature is increased, a more stable phase, with a gallery height of 5.2 Å corresponding to a solid with intercalated W7O246-, is formed, probably with grafting of the interlayer anion on the brucite-like layers. All systems are microporous. Calcination at 300 °C leads to amorphous species, and crystallized MgWO4 is observed at 700 °C." @default.
• W2078586516 created "2016-06-24" @default.
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• W2078586516 date "2003-12-03" @default.
• W2078586516 modified "2023-10-03" @default.
• W2078586516 title "Synthesis and Characterization of New Mg₂Al-Paratungstate Layered Double Hydroxides" @default.
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• W2078586516 doi "https://doi.org/10.1021/ic0347790" @default.
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• W2078586516 hasPublicationYear "2003" @default.
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