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Preparation method for obtaining orthorhombic or monoclinic molybdenum trioxide

A technology of molybdenum trioxide and monoclinic crystal, which is applied in chemical instruments and methods, molybdenum oxide/molybdenum hydroxide, metal/metal oxide/metal hydroxide catalysts, etc., which can solve the problems of high price and high catalyst cost , to achieve the effect of low cost, simple preparation method and good economic benefits

Active Publication Date: 2020-04-21
武汉睿辰标物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the electrocatalyst with the best performance for the hydrogen evolution reaction (HER) is a platinum-based catalyst, but platinum metal is a noble metal, which is expensive, and the cost of using it as a catalyst is very high.

Method used

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  • Preparation method for obtaining orthorhombic or monoclinic molybdenum trioxide
  • Preparation method for obtaining orthorhombic or monoclinic molybdenum trioxide
  • Preparation method for obtaining orthorhombic or monoclinic molybdenum trioxide

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preparation example Construction

[0025] The invention provides a method for preparing molybdenum trioxide in orthorhombic crystal form and monoclinic crystal form, which specifically includes the following steps:

[0026] S1. Smash the discarded silicon-molybdenum rod resistance wire into a block, and then ball-mill it into a nano-scale powder;

[0027] S2. Calcining the ball-milled nanoscale powder in an environment without protective gas, the calcination temperature is 575-650° C., and the calcination time is 60-240 minutes to obtain a mixture;

[0028] S3. Put the calcined mixture obtained in step S2 in a mixed solution of hydrofluoric acid and nitric acid with a ratio of 5:1 to 5:3 or a mixed solution of hydrofluoric acid and hydrogen peroxide with a ratio of 5:1 to 5:3 Soak for 60-480 minutes, wash with distilled water and absolute ethanol several times, filter, and dry to obtain molybdenum trioxide in different crystal forms, specifically

[0029] When the proportioning ratio of hydrofluoric acid and n...

Embodiment 1

[0033] S1. Smash the discarded silicon-molybdenum rod resistance wire into a block, and use a ball mill to grind it into a nano-scale powder;

[0034] S2. Calcining the ball-milled nanoscale powder in an environment without protective gas, the calcination temperature is 575° C., and the calcination time is 240 minutes to obtain a mixture;

[0035] S3. Soak the calcined mixture obtained in step S2 in a mixture of hydrofluoric acid and nitric acid at a ratio of 5:1 for 480 minutes, wash with distilled water and absolute ethanol several times, filter, and dry to obtain An orthorhombic molybdenum trioxide catalyst with oxygen catalytic activity. Such as figure 2 As shown, the obtained miscellaneous molybdenum trioxide is off-white solid powder.

Embodiment 2

[0037] S1. Smash the discarded silicon-molybdenum rod resistance wire into a block, and use a ball mill to grind it into a nano-scale powder;

[0038] S2. Calcining the ball-milled nanoscale powder in an environment without protective gas, the calcination temperature is 650° C., and the calcination time is 60 minutes to obtain a mixture;

[0039] S3. Soak the calcined mixture obtained in step S2 in a mixture of hydrofluoric acid and nitric acid with a ratio of 5:3 for 60 minutes, wash with distilled water and absolute ethanol several times, filter, and dry to obtain Oxygen catalytically active monoclinic molybdenum trioxide catalysts, such as image 3 As shown, it complies with the PDF#47-1320 card.

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Abstract

The invention discloses a preparation method of molybdenum trioxide with an orthorhombic crystal form and a monoclinic crystal form. The preparation method comprises the following steps: crushing andcoarsely grinding waste silicon-molybdenum rod resistance wires into blocks, and then carrying out ball milling on the blocks to obtain nano-scale powder; calcining the ball-milled nano-scale powder in an environment without protective gas to obtain a mixture, wherein the calcining temperature is 575-650 DEG C, and the calcining time is 60-240 minutes; and soaking the calcined mixture in a mixed solution of hydrofluoric acid and nitric acid with a ratio of (5:1)-(5:3) or a mixed solution of hydrofluoric acid and hydrogen peroxide with a ratio of (5:1)-(5:3) for 60-480 minutes, carrying out washing with distilled water and absolute ethyl alcohol for multiple times, and carrying out filtering and drying to obtain molybdenum trioxide with different crystal forms. According to the preparationmethod disclosed by the invention, the waste silicon-molybdenum rod resistance wires are adopted as raw materials, the molybdenum trioxide with different crystal forms can be obtained by carrying outlow-temperature calcining and controlling the pickling time and conditions, and different catalytic effects can be generated.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical catalysts, and relates to a method for preparing molybdenum trioxide in orthorhombic crystal form and monoclinic crystal form. Background technique [0002] With the depletion of fossil fuels and the increasingly severe energy crisis, people are paying more attention to the development of renewable energy. Since the early 1970s, hydrogen has been regarded as an ideal energy source. Hydrogen has the highest energy density among known fuels, and it is also a clean energy source with zero carbon dioxide emissions. Electrolyzed water can also obtain oxygen necessary for human survival. [0003] Our earth is rich in water resources. If renewable energy such as wind energy and solar energy can be used to generate electricity, a large amount of clean fuel can be prepared by direct electrolysis of water, which can alleviate the energy crisis well. At present, the electrocatalyst w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/02B01J23/28C25B11/06C25B1/04
CPCB01J23/28B01J35/0033C01G39/02C01P2002/72C25B1/04C25B11/04Y02E60/36
Inventor 周军双位阔戴文静王静高发明
Owner 武汉睿辰标物科技有限公司
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