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dervish金虫 (正式写手)
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【催化进展】Snapshots of Working Catalysts
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Snapshots of Working Catalysts Vanadium phosphates (VPOs) are used industrially to catalyze the partial oxidation of n-butane to maleic anhydride, which is then used as a starting material for products such as resins and lubricants. However, the reaction proceeds at elevated temperatures (in excess of 400°C), and VPO phases stable under those conditions will transform to other phases at ambient conditions, so an understanding of this catalyst demands that it be studied near its working conditions. Conte et al. (p. 1270) have used powder x-ray diffraction, as well as laser Raman spectroscopy and electron paramagnetic resonance spectroscopy, to determine the transformation of VPO phases as a function of temperature and with various reactants and products present over the catalyst. They conclude that the presence of the reactants rapidly converts -VOPO4 to -VOPO4, but that the initial formation of the phase may create the V5 sites associated with increased catalytic activity. 相关文章下载： http://www.box.net/public/3h5dlh7o7t [ Last edited by berlin on 2006-11-13 at 17:27 ] |
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