Abstract
When mixtures of NaY zeolite with V 2O 5 or MoO 3 are calcined in air at atmospheric pressure within well-defined temperature and composition ranges, the oxides migrate into the pores of the zeolite lattice. In contrast to these oxides, WO 3 does not diffuse into the pores of NaY after treatment under the same conditions. The differences in the behavior of each of these oxides with NaY are related to their dissimilar physical properties (melting point and solubility in hot water). Beyond certain temperature and oxide concentrations, the NaY lattice is destroyed and new phases are formed. These interactions and reactions in the solid state have been followed by X-ray diffraction and 29Si n.m.r. and 129Xe n.m.r. of adsorbed xenon.
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