Method for synchronously preparing phase pure alpha-MoO3 and beta-MoO3
A phase, part of the technology, applied in the field of simultaneous preparation of phase-pure α-MoO3 and β-MoO3, can solve the problems of inevitable contamination
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Embodiment 1
[0024] Install the ceramic filter (average pore size 2 μm) in the middle temperature section at 450-550°C on the right side of the horizontal tube furnace, and install the cloth bag in the right outlet (less than 100°C) area. Push the quartz crucible containing pure molybdenum trioxide to 1050°C for roasting from the left side, and generate molybdenum vapor with a concentration of 1g / / L, draw air to the right to make the vapor flow to the cooling section at a rate of 1cm / s, after 15min, the right side is 700 α-MoO with a thickness of about 4 cm was formed in the cooling section at -720 °C 3 layer. After that, increase the ventilation intensity to make the gas flow rate 2cm / s for 60min. In order to avoid insufficient raw materials, multiple charging can be carried out from the left side at any time during the roasting process. After the calcination, the product of the cooling section at 550-750°C and the product of the cooling section at less than 450°C are taken out respecti...
Embodiment 2
[0026] α-MoO formed in Example 1 3 On the basis of the layer, the gas flow rate was slowed down to 1cm / s, and other conditions remained unchanged. Figure 5 Shown is the product of the cooling section below 450°C, it can be seen that the products are still spherical β-MoO under this condition 3 , but compared with example 1, the product uniformity is slightly worse, and the particle size is slightly thicker, reaching 1-4 μm.
Embodiment 3
[0028] α-MoO formed in Example 1 3 On the basis of layers, reduce the calcination to 950°C, reduce the molybdenum vapor generation to 0.5g / L, increase the gas flow rate to 4cm / s, and keep other conditions unchanged. Figure 6 Shown is the product of the cooling section below 450°C, spherical β-MoO can be seen 3 The size drops significantly to 50-500nm.
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