| 摘要 |
An active oxidation catalyst having the formula: AaMocWdBbOx 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. |
