Abstract
Mo–Sn–O systems were characterized by Raman spectroscopy and electrical conductivity measurements. The catalysts were obtained from precipitation of SnCl 4 by ammonia in the presence of (NH 4) 2Mo 7O 24 using four different levels of Mo concentration. The electrical conductivity measurements showed that particles are formed by agglomeration of SnO 2 crystals aggregated by polymolybdate. Raman spectroscopy suggested that four-coordinated species are dispersed at the external surface while six-coordinated species are inside the particles. For high Mo concentration (Mo >10%), octahedral coordinated species are also on the surface. Bulk MoO 3 oxide was not observed. These results confirm the model previously proposed.
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