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The bulk mixed MoV(Te,Sb)(Nb,Ta)O catalysts containing nanoscale intergrowthsof so-called M1 and M2 phases display uniquely high reactivity in propaneammoxidation to acrylonitrile associated with the surface ab planes of the M1phase. The current controversy surrounding this catalytic system is focused onthe role of the M2 phase, which is unable to activate propane but was suggestedin some studies to function in synergy with the M1 phase by efficientlyconverting the propylene intermediate to acrylonitrile. The present studysystematically examined the catalytic behavior of pure M1 phases prepared byselective dissolution of the M2 phase in MoV(Te,Sb)(Nb,Ta)O catalysts inaqueous hydrogen peroxide. It confirmed that the MoV(Te,Sb)(Nb,Ta)O M1 phasesare highly active and selective for propane and propylene ammoxidation, whilethe MoV(Te,Sb)(Nb,Ta)O M2 phases were active and selective in propyleneammoxidation only. Most importantly, the kinetic study of theMoV(Te,Sb)(Nb,Ta)O M1 and M2 phases in propylene ammoxidation revealed for thevery first time that that the M2 phases are significantly less active than theM1 phase in propylene ammoxidation. The findings of this study do not supportthe existence of the synergy effect for any M1/M2 compositional variant.Instead, the observed behavior of MoV(Te,Sb)(Nb,Ta)O catalysts was consistentwith partial loss of some surface active species from the M1 phase surfaceduring the H2O2 treatment and generation of fresh ab planes of the M1 phase viamechanical grinding of the H2O2-treated M1 phase. These findings providedfurther evidence that the M1 phase is the only phase required for the activityand selectivity of the MoV(Te,Sb)(Nb,Ta)O catalysts in propane ammoxidation toACN.

A study of M1/M2 phase cooperation in the MoV(Te,Sb)(Nb,Ta)O catalysts for propane ammoxidation to acrylonitrile