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- W2067948686 abstract "Montmorillonite was pillared with mixed oxidic species of the form Al1−xFexOy where x=0.00, 0.05, 0.15, 0.25, 0.50, 0.75 and 100. The pillaring agent was an alkaline solution of the corresponding quantities of metal nitrates so as to obtain a final ratio (Al+Fe)/OH=1:2. The specific surface area (BET) of the samples dried at 500°C was found to be 230±10 m2 g−1 for x=0.00–0.50 and ∼139±8 m2 g−1 for x=0.75–1.00. The XRD results obtained at low angles from samples oriented along the (001) axis showed gallery heights of the heated solids of 16–17 Å for x=0.00–0.50 and 9.9–9.8 Å for x=0.75–1.00. The acidity of the samples, checked by TPD of NH3, varied from ∼12×1017 sites m−2 (x≥0.25) to ∼9×1017 sites m−2 (x≤0.75). The acid catalytic activity of the solids was checked using the isopropanol (IPA) decomposition as a probe reaction. The main products observed were propene (selectivity ≥80%) and di-iso-propyl ether (DIPE) (selectivity ≤20%). The apparent activation energies for the IPA conversion were calculated, and the selectivity dependence on temperature was kinetically modelled. From this, a mechanism was derived to account for the reactions of one or two IPA molecules towards propene or DIPE, respectively, and the dependence of the selectivity on the Al/Fe ratio and the acidity of the solids." @default.
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- W2067948686 date "1999-10-01" @default.
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- W2067948686 title "Preparation, characterization and surface acid catalytic activity of microporous clays pillared with Al1−xFexOy (x=0.00 to 1.00) oxidic species" @default.
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- W2067948686 doi "https://doi.org/10.1016/s1387-1811(99)00061-x" @default.
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