| 摘要 |
<p>A catalyst comprising (1) palladium, (2) phosphorous,(3) antimony, (4) X and (5) oxygen wherein X denotes at least one element selected from the group consisting of potassium, sodium, rubidium, lithium, cerium, beryllium, magnesium, calcium, vanadium, strontium, zinc, thorium and rhenium. There is also provided a process for the manufacture of methacrylic of acrylic acid by oxidizing methacrolein or acrolein with molecular oxygen in the vapor phase in the presence of the catalyst defined above.</p> |
