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Molybdenum is a chemical element with symbol Mo and atomic number 42.
M 4076 (OTTO) Molybdenum powder, -200 mesh, 99.98% - used in NO, NO2, NOx analyzers in power plants for pollution controls. At 350 °C (662 °F), the element acts as a catalyst for NO2/NOx to form NO molecules for detection by infrared light