Compared with “massive” or several micron molybdenum trioxide, the catalytic activity of nanometer molybdenum trioxide is significantly improved, and its catalytic effect is several times or even ten times higher for some chemical reactions. The corrosion resistance and oxidation resistance of nano-mo trioxide are also higher than that of traditional mo trioxide. Other properties, such as optical and electrical properties, are still under investigation. In addition, nanometer molybdenum trioxide is the precursor of some materials. Such as molybdenum powder, molybdenum aluminum composite materials, molybdenum carbide, molybdenum nitride and molybdenum tungsten composite materials.
Application example of nanometer Molybdenum trioxide 1:
Nano-molybdenum trioxide was used as catalyst of fluorinated trichlorotoluene or fluorinated polychlorotoluene. Add 1 556mol of 99% polychlorotoluene and 0 in 500mL teflon lined corrosion resistant reactor (equipped with agitator and temperature control meter) 0062mol nano-molybdenum trioxide catalyst, the material in the reactor was heated to 70℃, the condenser kept the temperature of the condensation device on the upper part of the reactor at -25℃, and hydrogen fluoride was poured into the reactor. The initial flow rate was 50mL/min, and then it gradually increased to 200mL/min. At this time, the reactants turned blue, and a total of 55 mol of hydrogen fluoride was poured into the reactor. During the test, gas chromatography was used to continuously monitor the reaction status, and the reaction lasted for 12h. After the reaction, hydrogen fluoride and heating were stopped. Then the residual hydrogen fluoride is removed by nitrogen, and the reaction product is released. After gas chromatography analysis, the reaction product contains 99% polyfluorotoluene. In a similar way, trichlorotoluene can be fluorinated into trifluoromethane using nano-molybdenum trioxide as catalyst for fluorination reaction.
Nanometer molybdenum trioxide alcohol is a good catalyst for oxidation of aldehydes. It is also a good catalyst for oxidation of aldehydes to carboxylic acids. The application of nano-mo trioxide and nano-hollow mo trioxide fibers in other chemical reactions is still under discussion.
Application example of nano-sized Molybdenum trioxide 2:
Nano molybdenum trioxide corrosion inhibitor coating. Nano molybdenum trioxide corrosion inhibitor coating is widely used in various steel parts, cast iron parts, galvanized parts corrosion inhibitor. It is well known that the atmospheric corrosion and other corrosion of steel parts can be controlled by treating various steel parts with hexavalent chromium. Because of people’s increasingly demanding requirements for the environment, the use of hexavalent chromium is strictly restricted, and the highly toxic hexavalent chromium is more difficult to be accepted by people. The stability of ultrafine zinc powder and aluminum powder coating in aqueous solution is poor, and the corrosion inhibition effect decreases when stored for a long time.
Nanometer molybdenum dioxide with nanometer zinc powder, organic solvents, such as glycol, diethylene glycol, triethylene glycol, or 2 propanol, etc.), thickening agent, such as hydroxyl methyl cellulose, hydroxyethyl cellulose and hydroxypropyl cellulose, etc.) silicon alkyl adhesive, sodium silicate and other ingredient share into a stable suspension (including the dosage of the nanometer molybdenum trioxide is 0 1% ~ 2%), the suspension is sprayed or coated on all kinds of steel parts by other methods, and cured at a certain temperature for 20 ~ 30min. At this time, a strong corrosion resistant coating is formed on the steel, and its thickness is 5 ~ 10μm. The coating has been tested to be very effective in inhibiting corrosion. In addition, ultrafine molybdenum powder and molybdenum oxide powder can be sprayed on the iron and steel parts by plasma. At this time, molybdenum trioxide and molybdenum dioxide coating can be formed on the iron and steel parts at 5 ~ 10nm. Example 3: Preparation of molybdenum powder from nanometer molybdenum trioxide.
CyprusAmaxMineralsCompamy developers using the sublimation of the legal system of nanometer molybdenum trioxide as raw material to try the hydrogen reduction using the raw materials for producing molybdenum powder.
The specific surface of molybdenum trioxide is 25 ~ 35m2/g, and nano-molybdenum trioxide is reduced to molybdenum powder by hydrogen in Harper rotary tube furnace. Harper tube furnace is a continuous three-stage heating type hydrogen reduction furnace, the reduction furnace is divided into three heating zones, the first zone heating temperature is 555℃, the second zone heating temperature is 800℃, the third zone heating temperature is 1000℃, the furnace is made of HT alloy, reduction mainly occurs in the second zone, the laboratory test hydrogen flow rate of 2 At 24m3/h, the flow direction of hydrogen reduction flow is opposite to that of molybdenum oxide. The specific surface of molybdenum powder obtained by reduction is 25 m2/g, and the particle size of molybdenum powder is relatively uniform and very narrow, the average particle size is less than 248 μm. Using traditional ammonium molybdate as raw material, the specific surface of molybdenum powder prepared by hydrogen reduction is 0.8 m2/g. The particle size distribution is wide. The properties of processed materials made of molybdenum powder are still under study. Example 4: Nanometer molybdenum trioxide is a catalyst for nitrogen production by azide combustion, which is widely used in automobile airbags.
