The effect of Nb or Ta substitution into the M1 phase of the MoV(Nb,Ta)TeO se…

Abstract. We use aberration corrected high-angle annular dark field (HAADF) imaging to systematically study, atomic column by atomic column, the effects of substituting Nb or Ta into the M1 phase of the MoV(Nb,Ta)TeO propane (amm)oxidation catalyst. The HAADF results indicate that the x,y coordinates of themetal sites within the M1 framework are unaffected by the substitution of either Nb o…