A catalyst for producing unsaturated aldehyde by oxidation of lower olefin at high space velocity

摘要

A method of preparing a catalyst for producing acrolein by oxidation of propylene at high space velocity, said catalyst is a Mo-Bi-Fe-Co based composite metal oxide. Producing unsaturated aldehyde via partial oxidation of lower unsaturated olefin at high space velocity using said catalyst is suitable for processes with or without off-gas recirculation. Said catalyst is prepared by co-precipitation. The reaction conditions for using said catalyst to produce unsaturated aldehyde are: the space velocity of unsaturated lower olefin relative to catalyst being 120 ˆ¼ 200h -1 (STP), reaction temperature being 300 - 4200°C and absolute pressure being 0.1 ˆ¼ 0.5 MPa. A single-stage unsaturated lower olefin conversion ratio of greater than 98.0% and a carbon oxide yield of less than 3.3% with an overall yield of unsaturated lower aldehyde and acid of greater than 94.0% are obtained. The process to prepare the said catalyst is simple, easy to be repeated and capable of industrial scale-up.