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Mesoporous Cr2O3–Phosphomolybdic Acid Solid Solution Frameworks with High Catalytic Activity

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journal contribution
posted on 27.09.2011, 00:00 by Ioannis Tamiolakis, Ioannis N. Lykakis, Alexandros P. Katsoulidis, Manolis Stratakis, Gerasimos S. Armatas
Mesoporous nanocomposite frameworks of chromium(III) oxide and 12-phosphomolybdic acid (PMA) compounds were prepared via a “nanocasting” method, using mesoporous silica SBA-15 as the template. Small-angle X-ray scattering, transmission electron microscopy, and nitrogen physisorption characterizations indicate that these materials possess a well-ordered hexagonal mesostructure with high content of PMA clusters (up to 63 wt %) and large internal surface area (up to 165 m2 g–1). The Keggin clusters are incorporated intact into the mesoporous walls forming a Cr2O3–PMA solid-solution structure, according to the X-ray diffraction and X-ray photoelectron and ultraviolet–visible light (UV/vis) spectroscopy. These Cr2O3–PMA nanocomposites demonstrated strong potential for green oxidative processes, exhibiting high catalytic activity and durability in oxidation of 1-phenylethanol using H2O2 as an oxidant.