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Loaded binary composite metal oxide catalytic ozonation catalyst and preparation method thereof

A technology of ozone catalytic oxidation and binary compounding, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc. High, fast decomposition speed and other issues, to achieve full degradation, excellent catalytic activity, the effect of improving the removal rate of organic matter

Inactive Publication Date: 2015-11-04
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Ozone has strong oxidizing properties, and it has a good effect on the advanced treatment of pulping wastewater. However, ozone is selective for the oxidative degradation of organic matter, and it has a high impact on the COD of wastewater. Cr The removal rate is not high, and the organic matter in the wastewater cannot be completely mineralized
In addition, ozone is unstable, its solubility in wastewater is not high, and its decomposition rate is fast, resulting in low utilization rate of ozone and high treatment cost

Method used

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  • Loaded binary composite metal oxide catalytic ozonation catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Catalytic performance of different binary metal oxide catalysts

[0035] According to the method, the γ-Al 2 o 3 Microspheres (WHA-202) were calcined at 500°C for 3 hours, placed in a desiccator and cooled to room temperature, and then activated γ-Al 2 o 3 Equal volumes were impregnated in binary metal ion mixed solutions, co-impregnated for 6 hours, dried at 105°C for 3 hours, and then calcined at 600°C for 4 hours to obtain a supported binary composite metal oxide catalyst.

[0036] Wherein, the binary metal ion mixed solution is respectively:

[0037] (1)Mn(NO 3 ) 2 with Fe(NO3 ) 3 The molar ratio is 3:2, and the total molar concentration is a mixed solution of 1mol / L;

[0038] (2)Mn(NO 3 ) 2 with Zn(NO 3 ) 2 The molar ratio is 3:2, and the total molar concentration is a mixed solution of 1mol / L;

[0039] (3)Mn(NO 3 ) 2 with Cu(NO 3 ) 2 The molar ratio is 3:2, and the total molar concentration is a mixed solution of 1mol / L;

[0040] Differ...

Embodiment 2

[0043] Embodiment 2: the catalytic performance of the ferromanganese binary metal oxide catalyst of different iron contents

[0044] According to the method, the γ-Al 2 o 3 Microspheres (WHA-202) were calcined at 500°C for 3 hours, placed in a desiccator and cooled to room temperature, and then activated γ-Al 2 o 3 Immerse equal volumes in a mixed solution of ferromanganese binary metal ions with a total molar concentration of 1mol / L, co-immerse for 6 hours, dry at 105°C for 3 hours, and then roast at 600°C for 4 hours to obtain a supported binary composite metal oxide material catalyst.

[0045] Among them, Mn(NO 3 ) 2 with Fe(NO 3 ) 3 The molar ratio of the two is 7:3, 6:4, 5:5, 4:6 respectively, and the supported binary composite metal oxide catalysts with different iron contents are prepared, and their performance is evaluated according to the performance evaluation method.

[0046] Table 2 Catalytic activity of catalysts with different Fe contents

[0047] ...

Embodiment 3

[0049] Embodiment 3: the influence of different calcination temperature on catalyst catalytic performance

[0050] According to the method, the γ-Al 2 o 3 Microspheres (WHA-202) were calcined at 500°C for 3 hours, placed in a desiccator and cooled to room temperature, and then activated γ-Al 2 o 3 Immersed in equal volume at a total molar concentration of 1mol / L, Mn(NO 3 ) 2 with Fe(NO 3 ) 3 In the mixed solution of manganese-iron binary metal ions with a molar ratio of 3:2, it was co-impregnated for 6 hours, dried at 105°C for 3 hours, and then calcined at 500-800°C for 4 hours to obtain a supported binary composite metal oxide catalyst , according to the performance evaluation method to evaluate its performance, the results are shown in Table 3.

[0051] It can be seen from Table 3 that the preparation of oxide catalysts by roasting at different temperatures has an impact on their catalytic performance, and the catalyst prepared by roasting at 500 °C has the best cata...

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Abstract

The invention belongs to the field of catalysts and discloses a loaded binary composite metal oxide catalytic ozonation catalyst with gamma-Al2O3 microspheres as carriers and manganese oxide and ferric oxide as active components and a preparation method thereof. The preparation method of the loaded binary composite metal oxide catalytic ozonation catalyst comprises dipping gamma-Al2O3 microspheres in a mixed solution containing water-soluble manganese salt and water-soluble ferric salt, taking out the gamma-Al2O3 microspheres, carrying out drying and carrying out high temperature roasting to obtain the loaded binary composite metal oxide catalytic ozonation catalyst. The loaded binary composite metal oxide catalytic ozonation catalyst has significantly improved particle uniformity, good stability, good reusability and excellent catalytic activity. Compared with gamma-Al2O3 microsphere or manganese and iron single component-loaded catalysts, the loaded binary composite metal oxide catalytic ozonation catalyst significantly improves an organic removal rate by at most 38%, greatly reduces paper-making wastewater organic pollutant types and content and fully degrades difficultly biodegraded organics.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a γ-Al 2 o 3 The invention discloses a supported binary composite metal oxide ozone catalytic oxidation catalyst with microspheres as a carrier and manganese oxide and iron oxide as active components and a preparation method thereof. Background technique [0002] Ozone has strong oxidizing properties, and it has a good effect on the advanced treatment of pulping wastewater. However, ozone is selective for the oxidative degradation of organic matter, and it has a high impact on the COD of wastewater. Cr The removal rate is not high, and the organic matter in the wastewater cannot be completely mineralized. In addition, ozone is unstable, its solubility in wastewater is not high, and its decomposition rate is fast, resulting in low utilization rate of ozone and high treatment cost. [0003] The catalytic ozonation method exerts the synergistic effect of ozone and catalyst, which can eff...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/78C02F103/28
Inventor 莫立焕谈金强王聪聪何帅明徐峻李军
Owner SOUTH CHINA UNIV OF TECH
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