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Thermal Stability of V-Loaded AlPo4-5 Materials

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A progressive sintering of the porosity of both V-free and V-loaded AlP04-5 samples is observed upon calcination in air at increasing temperatures. This sintering leads to the coexistence of porous AlP04-5 and dense tridymite. As established by cristallinity and pore volume measurements, the presence of vanadium decreases by 100 to 300°C the threshold temperature at which this sintering begins, in spite of the low V amount in the samples (V/(V+Al+P) atomic ratio of 0.5-1%). This threshold temperature depends on the method used to introduce V (by hydrothermal synthesis, under static conditions or agitation, and/or by grinding vanadia with a V-free AlP04-5) and on the morphology of the AlP04-5 crystals as observed by scanning electron microscopy. These factors are related to the dispersion of the V species within the porosity. Since only very small amounts of intraporosity VIV species (VIV/VT < 1%) are detected by ESR, whatever the extent of the sintering which generates tridymite, it is concluded that the thermal stability of V-loaded AlP04-5 is determined by the dispersion of Vv species within the porosity. This conclusion is in line with earlier propositions made to explain the thermal behaviour of V-loaded zeolites and V-contamined FCC catalysts.

Affiliations: 1: Laboratoire de Réactivité de Surface, UMR 7609, Université P. et M. Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France; 2: Department of Chemistry, University of Gilan, P. 0. Box 1914, Rasht, Iran; 3: Laboratoire de Cristallochimie du Solide, ER 556, 4 Place Jussieu, 75252 Paris Cedex 05, France; 4: Institut Universitaire de France


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