The chemical nature and characteristics of molybdenum

     1.3.1 Properties Molybdenum [3,4]
     Molybdenum in air at room temperature is stable; when the temperature at 400 ℃, minor oxidation (oxidized color can be seen); at 500 ~ 600 ℃, the metal molybdenum rapidly oxidized to MoO3; at 600 ~ 700 ℃, the molybdenum rapidly oxidized to MoO3 volatilization; higher than 700 ℃, the water vapor will strongly oxidized molybdenum MoO2.
     Molybdenum up to its melting temperature and hydrogen will not be any chemical reaction. However, when heated in H2 molybdenum, can absorb some of the solid solution H2 generated, for example, at 1000 ℃, 100g 0.5cm3 molybdenum can only absorb hydrogen and fine particles at 300 ℃ molybdenum metal powder can absorb hydrogen.
     Less than 1500 ℃, molybdenum and nitrogen does not react; higher than 1500 ℃, the molybdenum chemical reaction with nitrogen nitride. If the nitrogen pressure is low, to 2400 ℃ still do not see the reaction. The role of nitrogen and molybdenum, and nitrogen pressure and temperature related.
    Molybdenum target valence of +2, +4 and +6 +6 stable price. Molybdenum is a transition element, easy to change the oxidation state of the redox reactions in the body plays a role in electron transfer. The oxidized form, the molybdenum is likely to be in the +6 state. Although the electron transfer during which it is also likely to be restored first +5 valence state, but after the restoration of the enzyme was also found in other molybdenum oxidation state.
     Carbon, hydrocarbons and carbon monoxide, starting from 800 ℃, the interaction between the molybdenum and molybdenum carbide (Mo2C). Carbon dioxide at 700 ℃ or more, can make molybdenum oxide. Fluorine and molybdenum react rapidly at room temperature, 60 ℃ generate volatile fluorinated molybdenum MoF6, when the presence of oxygen to generate Mo2F2 or MoF4. Below 230 ℃, molybdenum on the drying chlorine has a strong corrosion resistance, 250 ℃ when the interaction between molybdenum and chlorine can; molybdenum susceptible to wet chlorine corrosion, generated with volatile molybdenum chloride MoCl5. Below 450 ℃, molybdenum on drying bromine has a strong corrosion resistance, temperature rises up to 550 ℃ or more, molybdenum reacts only with dry and bromine. Molybdenum in the air and wet bromine can react chemically.
     Iodine and Mo in 500 ~ 800 ℃ due to the reaction.
     When moisture is present, all the halogens are at room temperature for molybdenum work.
     Heating boron in the case of Mo interactions.