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Silica nanosphere supported molybdenum oxide quantum dot catalyst and preparation method thereof

A silica and nanosphere technology, applied in metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the synthesis method of supported molybdenum oxide quantum dot catalytic material Unrealized and other problems, to achieve the effects of excellent catalytic oxidation performance, uniform particle morphology, and simple steps

Pending Publication Date: 2020-03-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the synthesis method of supported molybdenum oxide quantum dot catalytic materials has not been realized

Method used

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  • Silica nanosphere supported molybdenum oxide quantum dot catalyst and preparation method thereof
  • Silica nanosphere supported molybdenum oxide quantum dot catalyst and preparation method thereof
  • Silica nanosphere supported molybdenum oxide quantum dot catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The mol ratio of Mo and Si is 0.125 in this example, and concrete preparation steps are as follows:

[0030] 0.09g of MoS 2 The powder and prepared silica nanospheres of corresponding quality were dissolved in 6 mL deionized water, and mixed under magnetic stirring until MoS 2 Mix the powder and silica nanospheres evenly, add 4mL hydrogen peroxide (30%, wt), react at room temperature for 10min, and then titrate the reaction solution to neutrality with 10.0mol / L NaOH solution, after titration, the sample is placed at 8000rpm Centrifuge for 10 minutes, take the precipitate and wash it with deionized water, then centrifuge at 8000rpm for 10 minutes, repeat the above operation for more than 3 times, and finally dry it in vacuum at 60°C to obtain the catalyst sample. Such as Figure 4 As shown, the average particle size of the samples prepared in this embodiment is about 300nm.

Embodiment 2

[0032] In this example, the reaction time is 20min, and the concrete preparation steps are as follows:

[0033] According to the molar ratio of Mo and Si is 0.125, 0.09g of MoS 2 The powder and prepared silica nanospheres of corresponding quality were dissolved in 6 mL deionized water, and mixed under magnetic stirring until MoS 2 Mix the powder and silica nanospheres evenly, add 4mL hydrogen peroxide (30%, wt), react at room temperature for 20min, then titrate the reaction solution to neutrality with 10.0mol / L NaOH solution, after titration, the sample is placed at 8000rpm Centrifuge for 10 minutes, take the precipitate and wash it with deionized water, then centrifuge at 8000rpm for 10 minutes, repeat the above operation for more than 3 times, and finally dry it in vacuum at 60°C to obtain the catalyst sample. Such as Figure 5 As shown, the average particle diameter of the samples prepared in this embodiment is about 330nm.

Embodiment 3

[0035] This example is a silica nanosphere-supported molybdenum oxide quantum dot catalyst to test the catalytic oxidation desulfurization performance of organic sulfur compounds. The selected sample is the silica nanosphere-supported molybdenum oxide quantum dot catalyst in Example 1. The used The target sulfur compound is benzothiophene.

[0036] Add 10mL of 400ppm benzothiophene model oil, 0.05g of catalyst and 30μL of hydrogen peroxide into a round-bottomed flask, and then place it in a constant temperature water bath with a preset temperature for reaction. After the reaction time is up, immediately take out the reaction flask and put it in ice water After cooling, constant volume and centrifugation, the upper organic phase was taken for sulfur content determination. As shown in the figure, the desulfurization rate of the sample prepared in this embodiment is 92.57%.

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Abstract

The invention provides a preparation method of a silica nanosphere supported molybdenum oxide quantum dot catalyst. The preparation method comprises the following steps: adding MoS2 powder and silicananospheres into deionized water, stirring the obtained mixture until the mixture is uniformly mixed, adding hydrogen peroxide, adjusting the obtained solution to be neutral by using an aqueous sodiumhydroxide solution after a reaction is completed, and then carrying out solid-liquid separation to obtain a solid part that is the silica nanosphere supported molybdenum oxide quantum dot catalyst. The invention aims to provide the preparation method of the silica nanosphere supported molybdenum oxide quantum dot catalyst. The silica nanosphere supported molybdenum oxide quantum dot catalyst synthesized by the method has the advantages of uniform morphology, uniform size, and excellent catalytic oxidation performance on organic sulfur-containing compounds.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a silicon dioxide nanosphere-supported molybdenum oxide quantum dot catalyst and a preparation method thereof. Background technique [0002] Molybdenum oxide is an important industrial oxidation catalyst and flame retardant. Because of its unique optical, electrical, semiconductor properties and catalytic performance, it has received extensive attention from domestic and foreign scholars in recent years. Molybdenum oxide can be divided into orthorhombic molybdenum trioxide (α-MoO 3 ), monoclinic molybdenum trioxide (β-MoO 3 ) and hexagonal molybdenum trioxide (h-MoO 3 ), where (α-MoO 3 ) belongs to the thermodynamically stable phase, and researchers have studied it more. At present, the preparation methods of molybdenum oxide include hydrothermal-solvothermal method, physical vapor deposition method, oxidation method, sol-gel method, microwave-assisted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J35/02B01J35/08B01J37/12C10G27/12B01J35/00
CPCB01J23/28B01J37/12C10G27/12C10G2300/202B01J35/40B01J35/51
Inventor 崔佳伟王光辉田永胜柯萍刘巍马志江徐浩伦
Owner WUHAN UNIV OF SCI & TECH
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