Abstract
Local structure and catalytic properties of molybdenum oxide supported on nanostructured SiO 2 (SBA-15) were studied under reaction conditions by combined X-ray absorption spectroscopy (XAFS) and mass spectrometry. MoO 3 supported on SBA-15 exhibits stability and catalytic properties different from those of binary bulk oxides. The interaction between support and molybdenum oxide stabilizes particular hexagonal MoO 3 structure that is highly active and selective. The hex-MoO 3–SBA-15 is stable under reducing (propene) and oxidizing reaction conditions in the temperature range from 20 to 500 °C. In contrast to bulk hex-MoO 3, the onset of activity at about 250 °C is not accompanied by a transformation to α-MoO 3. Moreover, in contrast to α-MoO 3, hex-MoO 3–SBA-15 is capable of directly oxidizing propene to acrylic acid without additional metal sites.
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