Patent ID: 8207080
Filing Date: 2012-06-26
Classification: B01J,C07C

Abstract:
1. A compound comprising a combination of a first and a second crystal phase, the first crystal phase being of the phosphomolybdic type, wherein the first crystal phase corresponds to formula (1): in which: A is an alkali metal; E represents tellurium; the indices a, b, c, d, e, g are such that: 0≦a≦3, 0<b≦3, 0≦c≦3, 0<d≦13, 0<e≦2, 0≦g≦3, and f represents the number of oxygen atoms necessary to satisfy the valence and the relative atomic proportions of the elements that are present, and the second crystal phase corresponds to formula (2): in which: Z is selected from the trivalent rare earths; X is selected from the elements V, Ga, Fe, Bi, Ce, Ti, Sb, Mn, Zn, Te; the indices g, h and i are such that: 0<g≦3, 0≦h≦3, 0≦i≦1, and j represents the number of oxygen atoms necessary to satisfy the valence and the relative atomic proportions of the elements that are present.