PARTIAL OXIDATION OF ISOBUTENE TO METHACROLEIN ON BI-W FE-CO-MO-K CATALYSTS/

The partial oxidation of isobutene to methacrolein and methacrylic aci d was studied on oxidic catalysts containing mainly a mixture of bismu th tungstate and iron-cobalt-potassium molybdate. Catalyst shaping was done by extrusion. The kinetic measurements were performed by monitor ing the gas-phase composition along the length of a fixed bed of catal yst. The reactor was treated as an isothermal plug-flow system. The ne twork of parallel and consecutive reactions taking place in this syste m can be described by a simplified scheme. It is possible to predict t he gas-phase composition prevailing in the reactor using five differen t kinetic parameters. In the temperature range 380 < theta < 420 degre es C grain selectivities as high as 85% combined with yields of methac rolein and methacrylic acid about 72% at 92% conversion were obtained.