| 摘要 |
PURPOSE:To provide a paraffin-oxidation catalyst exhibiting a high activity and excellent in selectivity of an alpha,beta-unsaturated compound and stability. CONSTITUTION:In a process for producing a 3 to 5C alpha,beta-unsaturated aldehyde or a 3 to 5C alpha,beta-unsaturated carboxylic acid by a gas-phase catalytic reaction between a 3 to 5C paraffin and molecular oxygen there is employed a catalyst comprising the composition represented by the general formula XMoaAbBcCdOp [X is Ta or Nb; A is W, V, Sn, Sb, Fe, Al, Cr, Co, Ni, Cu, Mg, Ca, Sr or Ba; B is Li, Na, K, Rb or Cs; C is Ce, Pr or Tb; (a), (b), (c), (d) and (p) show atomic ratios of the respective elements based on X. (a) is 0.1 to 24 and (b) is 0 to 20. (c) is 0 to 0.4 and (d) is 0 to 0.4. (p) is the number of atoms required for satisfying the valencies of the respective component elements] and not containing P nor As. |
