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How does bismuth phosphomolybdate help produce acrylonitrile?

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A labeled periodic table element box for bismuth shows atomic number 83, symbol Bi, atomic weight 208.9804, electron configuration, and properties including solid state, rhombohedral crystal structure, and weakly acidic oxides. — bismuth Properties of bismuth.

Bismuth phosphomolybdate ( ${BiPMo}_{12} O_{40}$ ) serves as an effective catalyst for the air oxidation of propylene and ammonia to produce acrylonitrile. This chemical process is essential for the manufacturing of acrylic fibres, plastics, and paints.1