Manganese-cobalt nanocrystalline catalyst for catalytic oxidation of methylbenzene as well as preparation method and application thereof

A catalytic oxidation, cobalt nanotechnology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve low crystallinity or amorphous form, toluene oxidation reaction High temperature, unfavorable practical application and other problems, achieve the effect of low cost, high concentration of reducible oxygen species, and good industrial application prospects

Inactive Publication Date: 2014-12-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, despite the state-of-the-art literature on the preparation of Mn-Co catalysts, the technical content of using a two-step hydrothermal method to prepare Mn-Co nanocrystals for the catalytic oxidation of toluene has not been reported so far.
Moreover, all the studied Mn-Co oxide catalysts exhibit low crystallinity or amorphous morphology, and the reaction temperature of toluene oxidation is still high, which is not conducive to practical application.

Method used

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  • Manganese-cobalt nanocrystalline catalyst for catalytic oxidation of methylbenzene as well as preparation method and application thereof
  • Manganese-cobalt nanocrystalline catalyst for catalytic oxidation of methylbenzene as well as preparation method and application thereof
  • Manganese-cobalt nanocrystalline catalyst for catalytic oxidation of methylbenzene as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Nanocrystalline MnO x The preparation of: first 0.65g Mn(NO 3 ) 2 and 0.65g NaOH were dissolved in 18.75mL deionized water, respectively. Subsequently, the NaOH solution was added dropwise to the Mn(NO 3 ) 2 The solution was stirred vigorously for 10 minutes, then placed in a reaction kettle, and kept at a constant temperature of 180°C for 4 hours. The obtained material was centrifugally washed and dried in an oven at 100°C for 10 hours, and finally the dried sample was baked in a muffle furnace at 350°C for 4 hours. Nanocrystalline Mn 3 o 4 .

[0028] Preparation of nanocrystalline Mn-Co oxides: a two-step hydrothermal method, above which Mn 3 o 4 The preparation is the first step. Subsequently, a certain proportion of Co(NO 3 ) 2 Dissolved in 18.75mL water, then the prepared Mn 3 o 4 The powder was ultrasonically dispersed in Co(NO 3 ) 2in solution. Then, with vigorous stirring, the above mixture was added dropwise into the NaOH solution, stirred for ...

Embodiment 2

[0038] According to the preparation method of the present invention in Example 1, Mn 3 o 4 According to the Mn / Co molar ratio of 1:1 ultrasonic dispersion in Co(NO 3 ) 2 in solution. The evaluation method of the catalyst is the same as in Example 1. The activity test showed that the reaction rate of the Mn-Co(1:1) sample was 11.2×10 -4 mol / (g·s), 4.0×10 -4 mol / (m 2 s), T 50 The temperature was 235°C.

Embodiment 3

[0040] According to the preparation method of the present invention in Example 1, Mn 3 o 4 According to the Mn / Co molar ratio of 2:1 ultrasonic dispersion in Co(NO 3 ) 2 in solution. The evaluation method of the catalyst is the same as in Example 1. The activity test showed that the reaction rate of the Mn-Co(2:1) sample was 7.0×10 -4 mol / (g·s), 3.0×10 -4 mol / (m 2 s), T 50 The temperature is 240°C.

[0041] The toluene oxidation activity of manganese-cobalt oxide catalysts with different molar ratios is shown in image 3 .

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Abstract

The invention belongs to the field of inorganic nano catalytic materials and relates to a manganese-cobalt nanocrystalline catalyst for catalytic oxidation of methylbenzene as well as a preparation method and application thereof. The manganese-cobalt nanocrystalline catalyst comprises Mn3O4, Co3O4 and a Mn-Co solid solution, wherein the molar ratio of Mn to Co in the active ingredients is (4:1)-(1:4) and Mn-Co oxide is presented in a highly sparse and porous cotton-shaped big grain form. The preparation method is a two-step hydrothermal synthesis method which comprises preparation of nanocrystalline Mn3O4 and preparation of a manganese-cobalt nanocrystalline catalyst. According to the invention, the prepared manganese-cobalt nanocrystalline catalyst is presented in a cotton-shaped big grain structure of high sparseness and porosity, is uniform and regular in nanocrystalline form and has a high specific surface area and wide application prospect as a methylbenzene removal catalyst with high activity and stability.

Description

technical field [0001] The invention belongs to the field of inorganic nano-catalytic materials, and relates to a manganese-cobalt nano-crystal catalyst used for catalytic oxidation of toluene, a preparation method and an application thereof. Background technique [0002] With the development of modern industry, environmental pollution is becoming more and more serious, and the prevention of environmental pollution has become a major issue related to the national economy and people's livelihood. VOCs mainly come from fuel combustion, industrial manufacturing and solvent emissions, and are very harmful to humans, animals and even plants. As a common solvent and additive, toluene is irritating to human skin and mucous membranes. Inhalation of high concentrations of toluene can also cause acute poisoning, and long-term exposure can also cause neurological diseases. It is a major VOCs pollutant. It is of great significance to strictly control the emission of VOCs pollutants and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/72B01D53/86
Inventor 曲振平李佳敏高康秦媛
Owner DALIAN UNIV OF TECH
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