| 摘要 |
<p>PURPOSE:To provide a catalyst precursor of a phosphorus-vanadium oxide catalyst at high yield in a relatively low temperature range wherein the precursor shows excellent reaction properties for a long duration by using an organic solvent, a pentavalent phosphorus compound, and a promotor component. CONSTITUTION:A pentavalent phosphorus compound and a pentavalent vanadium compound are reacted in an organic solvent and a hydrocarbon with carbon number 4 is oxidized in gas-phase to produce maleic anhydride. In that case, to produce a catalyst precursor, a mixture of a fatty acid alcohol with 3-6 carbon number and benzyl alcohol is used as an organic solvent, 98-100% phosphoric acid is used as the pentavalent phosphorus compound, and iron is used as a promotor. An oxide catalyst prepared by activation of the precursor oxidizes selectively the hydrocarbon with carbon number 4, especially saturated butane, to produce maleic anhydride at high yield for a long duration even in a relatively low temperature range.</p> |
