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In calcined and rehydrated VSiß zeolite prepared following a method described earlier, three kinds of tetrahedral VV species can be clearly identified by photoluminescence spectroscopy even at low V content, in contrast to 51V NMR and diffuse reflectance UV-Visible spectroscopies which do not allow them to be distinguished. A comparative study by photoluminescence and 51V NMR spectroscopies leads...
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