(DE19751046-A1)   NOVELTY - Heterogeneous, catalytic, gas-phase oxidation of propane to acrolein and/or acrylic acid comprises passing a mixture of propane, oxygen and optionally an inert gas, at 300-500degreesC, over a two-part fixed-bed catalyst, each part containing different, specific mixed metal oxide phases.    USE - Acrolein and acrylic acid are intermediates for polymers and other 'active compounds' (no more details).    ADVANTAGE - These catalysts provide high conversion with good selectivity for acrolein and acrylic acid, but low selectivity for propylene. In a typical example, conversion was 10%, and selectivities 54, 14 and 3 mole % for acrolein, acrylic acid and propylene, respectively.    (DE19753817-A1)   NOVELTY - Heterogeneous, catalytic, gas-phase oxidation of propane to acrolein and/or acrylic acid comprises passing a mixture of propane, oxygen and optionally an inert gas, at 300-500degreesC, over a two-part fixed-bed catalyst, each part containing different, specific mixed metal oxide phases.    USE - Acrolein and acrylic acid are intermediates for polymers and other 'active compounds' (no more details).    ADVANTAGE - These catalysts provide high conversion with good selectivity for acrolein and acrylic acid, but low selectivity for propylene. In a typical example, conversion was 10%, and selectivities 54, 14 and 3 mole % for acrolein, acrylic acid and propylene, respectively.    (DE19807079-A1)   NOVELTY - Heterogeneous, catalytic, gas-phase oxidation of propane to acrolein and/or acrylic acid comprises passing a mixture of propane, oxygen and optionally an inert gas, at 300-500degreesC, over a two-part fixed-bed catalyst, each part containing different, specific mixed metal oxide phases.    USE - Acrolein and acrylic acid are intermediates for polymers and other 'active compounds' (no more details).    ADVANTAGE - These catalysts provide high conversion with good selectivity for acrolein and acrylic acid, but low selectivity for propylene. In a typical example, conversion was 10%, and selectivities 54, 14 and 3 mole % for acrolein, acrylic acid and propylene, respectively.    (EP1025073-A1)   NOVELTY - Heterogeneous, catalytic, gas-phase oxidation of propane to acrolein and/or acrylic acid comprises passing a mixture of propane, oxygen and optionally an inert gas, at 300-500degreesC, over a two-part fixed-bed catalyst, each part containing different, specific mixed metal oxide phases.    USE - Acrolein and acrylic acid are intermediates for polymers and other 'active compounds' (no more details).    ADVANTAGE - These catalysts provide high conversion with good selectivity for acrolein and acrylic acid, but low selectivity for propylene. In a typical example, conversion was 10%, and selectivities 54, 14 and 3 mole % for acrolein, acrylic acid and propylene, respectively.    (CN1269776-A)   NOVELTY - Heterogeneous, catalytic, gas-phase oxidation of propane to acrolein and/or acrylic acid comprises passing a mixture of propane, oxygen and optionally an inert gas, at 300-500degreesC, over a two-part fixed-bed catalyst, each part containing different, specific mixed metal oxide phases.    USE - Acrolein and acrylic acid are intermediates for polymers and other 'active compounds' (no more details).    ADVANTAGE - These catalysts provide high conversion with good selectivity for acrolein and acrylic acid, but low selectivity for propylene. In a typical example, conversion was 10%, and selectivities 54, 14 and 3 mole % for acrolein, acrylic acid and propylene, respectively.    (TW425386-A)   NOVELTY - Heterogeneous, catalytic, gas-phase oxidation of propane to acrolein and/or acrylic acid comprises passing a mixture of propane, oxygen and optionally an inert gas, at 300-500degreesC, over a two-part fixed-bed catalyst, each part containing different, specific mixed metal oxide phases.    USE - Acrolein and acrylic acid are intermediates for polymers and other 'active compounds' (no more details).    ADVANTAGE - These catalysts provide high conversion with good selectivity for acrolein and acrylic acid, but low selectivity for propylene. In a typical example, conversion was 10%, and selectivities 54, 14 and 3 mole % for acrolein, acrylic acid and propylene, respectively.