摘要 |
A catalyst for the selective oxidation and amoxidation of alkanes and/or alkenes, particularly in processes for obtaining acrylic acid, acrylonitrile and derivatives of these, including a least one oxide of Mo, Te, V, Cu and at least another A component selected from among Nb, Ta, Sn, Se, W, Ti, Fe, Co, Ni, Cr, Ga, Sb, Bi, a rare, alkaline or alkali-earth earth, in such a way that the catalyst presents, in a calcined form, an X-ray diffractogram with five intensive diffraction lines, typically the most intense corresponding to diffraction angles of 2theta at 22.1±0.4, 27.1±0.4; 28.1±0.4, 36.0±0.4 and 45.1±0.4. In the preferred embodiment, the catalyst has the following empiric formula: <?in-line-formulae description="In-line Formulae" end="lead"?>MoTe<SUB>h</SUB>V<SUB>i</SUB>Cu<SUB>j</SUB>A<SUB>k</SUB>O<SUB>x </SUB><?in-line-formulae description="In-line Formulae" end="tail"?> in which h, i, j, k are values comprised between 0.001 and 4.0 and x depends on the oxidation status or valency of the Mo, Te, V, Cu and A elements.
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