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Preparation method for supported molybdenum oxide catalyst and application thereof

A molybdenum oxide and catalyst technology, which is applied in the preparation of supported molybdenum oxide catalyst and its application field, can solve the problems such as difficulty in meeting the requirements of nanometer size and specific surface area, and achieve the advantages of reactant diffusion and active site exposure and production. The effect of low cost and excellent yield

Active Publication Date: 2018-01-19
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the above-mentioned existing preparation methods are difficult to meet the requirements of nanoparticle size and specific surface area.

Method used

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  • Preparation method for supported molybdenum oxide catalyst and application thereof
  • Preparation method for supported molybdenum oxide catalyst and application thereof
  • Preparation method for supported molybdenum oxide catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of molybdenum dichloride hydrate precursor: 2g molybdenum pentachloride MoCl 5 Mix with 6g powder at a mass ratio of 1:3, transfer to a tube furnace, roast at 650°C for 5h under a nitrogen atmosphere, then cool to room temperature, and then wash three times with 100ml of concentrated hydrochloric acid at 50°C with a concentration of 25wt%. , collect the washing solution, and put the washing solution in a low-temperature refrigerator to stand overnight to obtain yellow needle-like crystals, collect the crystals after filtration and dry to obtain the molybdenum dichloride hydrate precursor (H 3 O) 2 (Mo 6 Cl 8 ) Cl 6 ·6H 2 O;

[0039] (2) Preparation of supported molybdenum oxide catalyst: The molybdenum dichloride hydrate precursor (H 3 O) 2 (Mo 6 Cl 8 ) Cl 6 ·6H 2 O was dissolved in commercially available analytically pure methanol, and slowly added dropwise to multi-walled carbon nanotubes after it was completely dissolved. , after methanol ...

Embodiment 2

[0043] (1) Preparation of molybdenum dichloride hydrate precursor: mix molybdenum pentachloride and molybdenum powder at a mass ratio of 1:2, transfer them into a tube furnace, and roast them at 600 °C for 5 h in an argon atmosphere, then Cool to room temperature, then wash three times with concentrated hydrochloric acid at 40°C with a concentration of 30wt%, collect the washing liquid, and put the washing liquid in a low-temperature refrigerator to stand overnight to obtain yellow needle-shaped crystals, collect the crystals after filtration and Dry to obtain molybdenum dichloride hydrate precursor (H 3 O) 2 (Mo 6 Cl 8 ) Cl 6 ·6H 2 O;

[0044] (2) Preparation of supported molybdenum oxide catalyst: According to the mass ratio of molybdenum dichloride hydrate precursor to ethanol as 1:90, 500 mg of molybdenum dichloride hydrate precursor (H 3 O) 2 (Mo 6 Cl 8 ) Cl 6 ·6H 2 O was dissolved in commercially available analytical pure ethanol to make solution A; 500mg of z...

Embodiment 3

[0050] (1) Preparation of molybdenum dichloride hydrate precursor: mix molybdenum pentachloride and molybdenum powder at a mass ratio of 1:5, transfer them to a tube furnace, and bake them at 700 °C for 5 h in a helium atmosphere, then Cool to room temperature, then wash three times with 60°C concentrated hydrochloric acid with a concentration of 20wt%, collect the washing liquid, and put the washing liquid in a low-temperature refrigerator to stand overnight to obtain yellow needle-shaped crystals, collect the crystals after filtration and Dry to obtain molybdenum dichloride hydrate precursor (H 3 O) 2 (Mo 6 Cl 8 ) Cl 6 ·6H 2 O;

[0051] (2) Preparation of supported molybdenum oxide catalyst: The molybdenum dichloride hydrate precursor (H 3 O) 2 (Mo 6 Cl 8 ) Cl 6 ·6H 2O was dissolved in commercially available analytically pure methanol, and slowly added dropwise to the mesoporous material SBA-15 after it was completely dissolved. After 12h, methanol was removed by...

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Abstract

The invention discloses a preparation method for a supported molybdenum oxide catalyst and an application thereof. The preparation method comprises the following steps: firstly preparing a molybdenumdichloride hydrate precursor, dissolving the obtained molybdenum dichloride hydrate precursor into methanol or ethanol, slowly adding the obtained liquid into a carrier dropwise after the precursor iscompletely dissolved, allowing the obtained mixture to stand, performing evaporation, and performing roasting under an inert gas atmosphere to obtain the supported molybdenum oxide catalyst. The application of the supported molybdenum oxide catalyst including that the supported molybdenum oxide catalyst is used for hydrogenation depolymerization of lignin, is used for preparing aniline from nitrobenzene and is used as a composite electrode material. The catalyst provided by the invention has the advantages of having small particles and a large specific surface area, being beneficial for reactant diffusion and active site exposure and the like, and meanwhile the catalyst has similar noble-metal catalytic performance, and can be widely applied to the fields such as biomass catalytic conversion and electrode materials.

Description

technical field [0001] The invention relates to a preparation method and application of a supported molybdenum oxide catalyst. Background technique [0002] Molybdenum is an element that is abundant in the earth's crust and has the advantage of low cost. The oxides of molybdenum mainly include molybdenum trioxide and molybdenum dioxide. Molybdenum trioxide is an extremely important intermediate compound for the production of metal molybdenum, mainly used in the production of various molybdenum-based products. Molybdenum trioxide has a unique two-dimensional layered structure and has special properties in the fields of photochromism, electrochromism and catalysis. MoO 3 It is an octahedral acidic oxide, and the Mo atom is in the center of the octahedron surrounded by six oxygen atoms. The nanostructured molybdenum trioxide has broad application prospects in the fields of catalysts, battery electrodes, photochromic materials and the like. MoO 3 Easily reverts to MoO 2 ....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J29/03B01J35/10C07C37/52C07C39/00C07C209/36C07C211/52H01G11/46H01M4/48
CPCY02E60/10
Inventor 宋国勇肖领平易宇轩陈小红王水众孙建奎李赫龙
Owner BEIJING FORESTRY UNIVERSITY
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