| abstract |
FIELD: chemistry. n SUBSTANCE: invention relates to polymetallic oxide mass, envelopment catalyst, solid catalytically active moulded article, production of polymetallic oxide mass, method for heterogeneous catalysed gas-phase partial oxidation of propylene to acrolein and acrylic acid. Polymetallic oxide mass as active mass for catalysis of heterogeneous catalysed gas-phase partial oxidation of propylene to acrolein and acrylic acid of general stoichiometric formula I, Mo 12 Bi a Co b Fe c K d Si e O x (I) , where variables assume following values: a = from 0.5 to 1, b = from 7 to 8.5, c = from 1.5 to 3.0, d = from 0.04 to 0.15; e = from 0.5 to 2.5 and x is an integer defined by valence and elements other than oxygen in formula I, and following conditions are satisfied: condition 1: 12-b-1.5⋅c=A and 0.5 ≤ A ≤ 1.5; condition 2: 0.2 ≤ a/A ≤ 1.3 and condition 3: 3≤b/c≤9. Envelopment catalyst includes a moulded support article and located on outer surface of moulded support article shell, at least one polymetallic oxide mass as active mass. Method of producing polymetallic oxide mass involves creating, from sources of elementary components thereof, a fine dry mixture and calcining said mixture at temperatures within range of 350–650 °C. Method for heterogeneously catalysed gas-phase partial oxidation of propylene to acrolein and acrylic acid is carried out on catalyst bed, which contains polymetallic oxide mass. n EFFECT: containing Mo, Bi and Fe polymetallic oxide mass as active mass of catalysts for gas-phase partial oxidation with heterogeneous catalysis of propylene to acrolein into main product and acrylic acid as a desirable by-product enable to improve overall selectivity of formation of acrolein and acrylic acid. n 12 cl, 6 dwg, 3 tbl |