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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

Active Publication Date: 2021-01-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the generated α-MoO 3 It will enter the low temperature section with the airflow, and the β-MoO in the low temperature section 3 will inevitably be contaminated, which is common even in molybdenum vapor quenching processes

Method used

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  • Method for synchronously preparing phase pure alpha-MoO3 and beta-MoO3
  • Method for synchronously preparing phase pure alpha-MoO3 and beta-MoO3
  • Method for synchronously preparing phase pure alpha-MoO3 and beta-MoO3

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for synchronously preparing phase pure alpha-MoO3 and beta-MoO3. The invention belongs to the technical field of molybdenum chemicals and metallurgical furnace burdenproduction and preparation. Industrial molybdenum oxide or pure molybdenum trioxide is used as a raw material, molybdenum trioxide steam is generated through roasting, one part of molybdenum steam iscooled and desublimated in a high-temperature section to form a phase pure alpha-MoO3 layer, the other part of molybdenum steam passes through the alpha-MoO3 layer and a ceramic filter in a medium-temperature section through air draft, and phase pure beta-MoO3 is produced through desublimation in a low-temperature section. According to the method, a filtering system is jointly constructed by thealpha-MoO3 layer generated by molybdenum steam slow cooling and porous ceramic, so that the inclusion of alpha-MoO3 in the low-temperature section is remarkably reduced, and a product consisting of pure alpha-MoO3 and beta-MoO3 phases is synchronously prepared by molybdenum steam slow cooling.

Description

technical field [0001] The invention relates to a synchronous preparation of phase-pure α-MoO 3 and β-MoO 3 The method belongs to the technical field of production and preparation of molybdenum chemicals and molybdenum metallurgical charges. Background technique [0002] Molybdenum trioxide can be used to prepare refractory alloys, catalysts, smoke suppressants, coatings, precision ceramics, etc. At present, commercially available pure molybdenum trioxide is mainly prepared by ammonium molybdate roasting method or molybdenum calcine sublimation method, and its main phase is orthorhombic α-MoO 3 , mostly needle-like in shape. Relatively speaking, monoclinic β-MoO 3 It is relatively rare in the market. As a metastable crystal, β-MoO 3 With unique optical, electrical and catalytic properties, it has great application potential in the fields of methanol catalytic formaldehyde, photochromic and electrochromic glass, powder metallurgy wire drawing and other fields. In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02
CPCC01G39/02C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2004/64
Inventor 李光辉孙虎罗骏姜涛饶明军张鑫蒋昊卜群真
Owner CENT SOUTH UNIV
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