| 摘要 |
Catalysts contg. oxides of Mo, V, P, Cu, Sn, Th, Al, Ge, Ni, Fe, Co, Zn, Ti, Pb, Re, Zr, Ce, Cr, Bi, As, K, Rb, Cs and/or Tl, are useful for the oxidn. of Me2CHCHO to methacrolein and methacrylic acid with high activity, yields, and selectivity in long use. The catalysts are prepd. with heteropoly-acids. (MoaVbPcXdOf).
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