| 摘要 |
<p>The invention concerns a method of oxygen dehydrogenation of a C1-C12 alkane, linear, branched or cyclic, leading to the corresponding alkene consisting in contacting in vapour phase said alkane with molecular oxygen or a gas containing molecular oxygen, at a temperature between 200 and 800 °C, under pressure ranging from atmospheric pressure up to 6 bars, and in the presence of a catalyst. The method is characterised in that it consists in using as catalyst at least a mineral and porous substance with crystalline phase, having a hexagonal arrangement of pores of uniform dimension of at least 1.3 nm in diameter and having, after calcination, a hexagonal electronic diffraction pattern which can be indexed with a value of d100 greater than 1.8 nm, said substance having the following composition: (Me)x.(SiO2)y.(Al2O3)z, (Me = metal selected among V, Mn, Fe and Co; x, y and z represent the mass percentages of the substances Me, SiO2 and Al2O3 in the active mass respectively, and comply with the following relationships: 0.1 % ≤ x ≤ 20 %; 40 % ≤ y ≤ 100 %; 0 ≤ z ≤ 40 %).</p> |
