COMPOUND COMPRISING THE COMBINATION OD A FIRST PHOSPHOMOLYBDENUM CRYSTAL PHASE AND A SECOND CRYSTAL PHASE, AND USE THEREOF AS ALKANE OXIDATION CATALYST

摘要

The invention concerns a compound comprising a combination of two crystal phases. The first crystal phase corresponds to the formula: A_aE_bV_cMo_dP_eO_fH_g wherein A is an alkali-metal; E is Te, Sb or Bi; and 0 = a = 3, 0 < b = 3, 0 = c = 3, 0 < d = 13, 0 < e = 2, 0 = g = 3. The second crystal phase corresponds to the formula Z_gMo_hX_iO_j wherein: Z is selected among trivalent rare earths; X is selected among the elements V, Ga, Fe, Bi, Ce, Ti, Sb, Mn, Zn, Te; and 0 < g = 3, 0 = h = 3, 0 = i = 1. The indices f and j represent the number of oxygen atoms required for satisfying the relative valency and atomic proportions of the elements present. The invention also concerns the method for preparing said compound, and its use in particular as catalyst for oxidizing alkanes.