| abstract |
Oxide complex catalysts represented by the following general formula (1) are provided: (see formula) (in which, A is nickel and cobalt; B is sodium, potassium, rubidium, cesium, and thallium; C is an alkaline earth metal ; D is phosphorus, tellurium, antimony, tin, cerium, lead, niobium, manqnese, arsenic, boron and zinc; E is silicon, aluminum, titanium or zirconium; and where at 12, 0? B? 10, 0 <c? 10, 0 <d? 10, 2? E? 15, 0 <f? 10, 0? G? 10, 0? H? 4 and 0? I? 30), The catalysts are characterized by the molar relationship of the anions Nitrate to molybdenum at the time of catalyst preparation are more than 1 but not more than 1.8. When used in the reaction to produce (meta) acrolein and (meth) acrylic acid by the vapor phase oxidation of at least one compound selected from propylene, isobutylene, t-butanol and methyl-t-butyl ether, the catalysts have excellent activity and selectivity and keep its performance stable for a prolonged period. |