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A simultaneous preparation of phase-pure α-moo 3 and beta-moo 3 Methods

A phase, part of the technology, applied in the field of simultaneous preparation of phase pure α-MoO3 and β-MoO3, can solve the problem of inevitable pollution and so on

Active Publication Date: 2021-11-16
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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  • A simultaneous preparation of phase-pure α-moo <sub>3</sub> and beta-moo <sub>3</sub> Methods
  • A simultaneous preparation of phase-pure α-moo <sub>3</sub> and beta-moo <sub>3</sub> Methods
  • A simultaneous preparation of phase-pure α-moo <sub>3</sub> and beta-moo <sub>3</sub> Methods

Examples

Experimental program
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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 Floor. After that, increase the ventilation intensity to make the gas flow rate 2 cm / s for 60 min. 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 respec...

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 shows the products in the cooling section below 450 °C, and 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 also 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. Image 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 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 metallurgical charge. The present invention uses industrial molybdenum oxide or pure molybdenum trioxide as raw material, generates molybdenum trioxide vapor through roasting, and a part of the molybdenum vapor is cooled and sublimated in the high temperature section to form phase pure α-MoO 3 layer, another part of the molybdenum vapor is pumped through α‑MoO 3 Layer and ceramic filter in the middle temperature section, desublimation in the low temperature section to produce biophase pure β‑MoO 3 . The present invention utilizes α-MoO generated by slow cooling of molybdenum vapor 3 The filtration system jointly constructed by layer and porous ceramics significantly reduces α‑MoO 3 The inclusion in the low temperature section realizes the simultaneous preparation of pure α-MoO by slow cooling of molybdenum vapor 3 and β-MoO 3 A product composed of phases.

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 Patents(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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