| 摘要 |
<p>A catalyst composition has one of the empirical formulae A) Moa Vb Sbc Xa Ob, B) Moa Vb Gec Xd Ye Ob, C) Moa Vb Wc Xa Ye Ob or D) Moa Vb Wc Lad Xe Ob where X and Y, as well as a, b, c, d, e and f, are defined in Claim 1. The catalyst composition can be used for preparing acrylic acid or methacrylic acid from acrolein or methacrolein by oxidation with molecular oxygen.</p> |
