Patent ID: 7683213

Claim:
A method for preparing acrylic acid from propane, characterized in that a gas mixture comprising propane, steam and, optionally, an inert gas and/or molecular oxygen, is passed over a catalyst conferring good selectivity, comprising a crystalline catalyst phase: satisfies the formula (I): Te a Mo 1 V b Nb c O x (I) in which a is between 0.1 and 2 limits included; b is between 0 and 1 limits included; c is between 0 and 0.2 limits included; x and y represent the quantity of oxygen bound to the other elements and depends on their oxidation states, and corresponds to a hexagonal lattice structure of which the X-ray diffraction spectrum, diffraction angles (2θ) measured using the copper Kα 1 and Kα 2 lines as an X-ray source, with a 0.02° step, has a peak at the diffraction angle 28.2° and lattice parameters a=0.729 (±0.02) nm×p, p being an integer from 1 to 4; c=0.400 (±0.01) nm×q, q being an integer from 1 to 2; α=90°, Y=120°, or of a monoclinic structure Te 2 MoO 7 or Te 0.2 MoO x , combined with a crystalline catalyst phase for activating the propane.