Method of production of acrylic or methacrylic acid by oxidation of methacrolein or acrolein by the oxygen is a continuation in the presence of water vapor

摘要

P the present invention relates to a process for the production of acrylic or methacrylic acid by oxidation of methacrolein or of acrolein by the molecular oxygen in the presence of steam. / p & & p & it is characterized in that it uses the reaction mixture in contact with a catalyst containing, by way of major constituents, palladium, phosphorus, antimony, oxygen, and at least one metal x belonging to the list is formed by the group of the following metals: potassium, sodium, rubidium, lithium, cerium, beryllium, magnesium, calcium, vanadium, strontium, zinc, thorium and rhenium. / p & & p & it relates to these catalysts and to their use. / p