METHOD FOR THE PRODUCTION OF OLEFINS, ALDEHYDES, AND CARBOXYLIC ACIDS BY OXIDATION OF ALKANES

摘要

The invention relates to methods for producing olefins, aldehydes, and/or carboxylic acids by oxidizing alkanes that have 2 to 4 C atoms. Said methods comprise the following steps: (i) a gas mixture containing at least one alkane with 2 to 4 C atoms and oxygen is provided; (ii) said gas mixture is brought in contact with a catalyst at a reaction temperature ranging from 200 to 500°C, said catalyst being embodied as a mixed oxide having a Cs(WNb)₅O₁₄-type orthorhombic structure of formula M₁V_pA_qB_rC_sO_n, wherein M represents one or several elements selected among the group encompassing molybdenum and tungsten; V represents vanadium; A represents one or several elements selected among the group encompassing niobium, tantalum, bismuth, phosphorus, zirconium, titanium, hafnium, gallium, chromium, iron, cobalt, aluminum, rhenium, manganese, ruthenium, germanium, indium, tin, boron, and rare earth metals; B represents one or several elements selected among the group encompassing alkali metals, alkaline earth metals, thallium, and zinc; C represents one or several elements selected among the group encompassing palladium, platinum, gold, silver, rhodium, iridium, nickel, and copper; O represents oxygen; p, q, r, s, and n represent the respective atomic ratio of M, V, A, B, C, and O, provided that p = 0.001 to 2.0; q = 0 to 0.9; r = 0 to 0.2; s = 0 to 0.1; and n represents a number defined by the valence requirements of the provided elements.