COMPLEX OXIDE CATALYSTS AND PROCESS FOR PRODUCING (METH)ACROLEIN AND (METH)ACRYLIC ACID

摘要

COMPLEX OXIDE CATALYSTS REPRESENTED BY THE FORMULA,Moa Wb Bic Fed Ae Bf Cg Dh Ei Ox (IN WHICH A IS Ni OR Co; B IS Na, K, Rb, Cs OR TI; C IS AN ALKALINE EARTH METAL; D IS P, Te, Sb, Sn, Ce, Pb, Nb, Mn, AS, B OR Zn; E IS Si, Al, Ti OR Zr; AND WHERE A IS 12, 0b10, 0c10, 0d10, 2e15, 0f10, 0g10, 0h4 AND 0i30) ARE PROVIDED. THE CATALYSTS ARE CHARACTERIZED IN THAT THE MOLAR RATIO OF THE TOTAL NITRATE ANIONS TO THE MOLYBDENUM AT THE TIME OF CATALYST PREPARATION IS MORE THAN 1 BUT NOT MORE THAN 1.8. WHEN USED IN THE REACTION FOR PRODUCING (METH)ACROLEIN AND (METH)ACRYLIC ACID BY VAPOR-PHASE OXIDATION OF AT LEAST A COMPOUND SELECTED FROM PROPYL-ENE, ISOBUTYLENE, T-BUTANOL AND METHYL-T-BUTYL ETHER, THE CATALYSTS EXHIBIT EXCELLENT ACITIVITY AND SELECTIVITY AND MAINTAIN STABLE PERFOR-MANCE OVER PROLONGED PERIOD.