Synergetic effect between phases in MoVTe(Sb)NbO catalysts used for the oxidation of propane into acrylic acid

Role of MoVTeNb oxide catalyst constituent phases in propane oxidation to acrylic acid.

“…and M2 phases cooperation in providing a high yield of acrylic acid [16][17][18][19]. The M1 phase of the optimal chemical composition The M1 phase is sufficient for efficient proceeding of the 6 and VO 6 octahedrons [7].…”

Active Sites for Propane Oxidation: Some Generic Considerations

“…Although reports exist [23,32] on attempts supported by high-throughput experimentation to improve the function of the M1 phase and to benefit from a suspected synergy [33][34][35] with the related hexagonal M2 [36,37] phase, it is established [38] that a stable and long-term performance can also be achieved with the bare single [39] M1 phase. This gives hope that a detailed understanding of the mode of operation can be obtained based upon accurate oxide crystallography [40] forming the basis of a detailed understanding [41] of the nature of the active site.…”

On the nature of active sites in MoVTeO and MoVTeNbO catalysts: The influence of catalyst activation temperature

“…procedure, composition, etc [3,4,8,9,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. However, the catalytic behavior of these catalysts is strongly related to the presence of M1 phase [18,22,23], although the presence of M2, in some case, could have a synergic effect [17][18][19].…”

“…XPS results have suggested some differences between bulk and surface [8b, 12,17,28], although the modifications in the oxidation state of elements could also be related to the catalyst activation procedure [7]. However, more important changes could occur on the surface of catalysts, which cannot be completely followed by XPS.…”