An active oxidation catalyst having the formula: A.sub.a Mo.sub.c W.sub.d B.sub.b O.sub.x wherein A is at least one of the metals cobalt, nickel, manganese and/or lead; B is at least one of the metals iron, bismuth, chromium and/or thallium; a is the sum of each of the metals A and ranges from greater than zero to about 12; c and d each ranges from zero to 12, with their sum being about 12; b is the sum of each of the metals B and ranges from greater than zero to about 1.5[(c+d)-a]; an x fulfills all unsatisfied valences, is prepared by (I) intimately admixing (i) a first aqueous solution comprising the ammonium salts of the molybdenum and/or tungsten, said ammonium salts being present therein in amounts such as to satisfy the formula parameters c and d, with (ii) a second aqueous solution comprising the salts of the A and/or B metals, at least one of said A and/or B salts being either a nitrate or a chloride and said salts being present therein in amounts such as to satisfy the formula parameters a and b, until a first solids fraction precipitates therefrom; (II) thereafter basicifying the resulting suspension with ammonia to a pH value in excess of the pH of said first aqueous solution, until a second solids fraction precipitates therefrom; (III) recovering said first and said second solids fractions, and drying the same; and (IV) thence calcining said dried solids fractions.
具有以下
化学式的活性氧化催化剂:A.sub.a Mo.sub.c W.sub.d B.sub.b O.sub.x,其中A至少是
钴、
镍、
锰和/或
铅中的一种
金属;B至少是
铁、
铋、
铬和/或
铊中的一种
金属;a是每种
金属A的总和,并且范围从大于零到约12;c和d各自范围从零到12,它们的总和约为12;b是每种
金属B的总和,并且范围从大于零到约1.5[(c+d)-a];x满足所有未满足的价,是通过以下步骤制备的:(I)将(i)第一种含有
钼和/或
钨铵盐的
水溶液(该
铵盐以满足公式参数c和d的量存在其中)与(ii)第二种含有A和/或B
金属盐的
水溶液混合,其中至少一种A和/或B盐是
硝酸盐或
氯化物,这些盐的存在量满足公式参数a和b,直到第一固体分数从中沉淀出来;(II)然后用
氨碱化所得悬浮液,使其pH值超过第一种
水溶液的pH值,直到第二固体分数从中沉淀出来;(III)回收所述第一固体分数和第二固体分数,并将其干燥;(IV)然后煅烧所述的干燥固体分数。