We report here about an investigation on the role of Nb5+ when used as a promoter for vanadyl pyrophosphate, catalyst for the oxidation of n-butane to maleic anhydride. The effect of Nb was very complex, a function of both its amount and the reaction temperature used. The optimal catalytic behavior was shown for very low Nb contents, i.e., for a V/Nb atomic ratio as low as 150. The main role of Nb was that of accelerating the formation of a limited amount of -VOPO4 on the surface of vanadyl pyrophosphate, by accelerating the oxidation of V4+ into V5+ under reaction conditions.
Improved performance of Nb-doped Vanadyl Pyrophosphate, catalyst for n-butane oxidation to maleic anhydride / G. Pavarelli; A. Caldarelli; F. Cavani; C. Cortelli; S. Luciani. - STAMPA. - 2013-2:(2013), pp. 93-97.
Improved performance of Nb-doped Vanadyl Pyrophosphate, catalyst for n-butane oxidation to maleic anhydride
PAVARELLI, GIULIA;CALDARELLI, AURORA;CAVANI, FABRIZIO;CORTELLI, CARLOTTA;LUCIANI, SILVIA
2013
Abstract
We report here about an investigation on the role of Nb5+ when used as a promoter for vanadyl pyrophosphate, catalyst for the oxidation of n-butane to maleic anhydride. The effect of Nb was very complex, a function of both its amount and the reaction temperature used. The optimal catalytic behavior was shown for very low Nb contents, i.e., for a V/Nb atomic ratio as low as 150. The main role of Nb was that of accelerating the formation of a limited amount of -VOPO4 on the surface of vanadyl pyrophosphate, by accelerating the oxidation of V4+ into V5+ under reaction conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
