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Preparation method of catalyst for ultraviolet catalytic wet-type oxidation

A technology for catalytic wet oxidation and catalyst, which is applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. and other problems, to achieve the effect of high catalytic efficiency, strong redox ability, and reduced operating costs

Inactive Publication Date: 2019-02-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The membrane concentrate has the characteristics of high concentration of organic matter, large chroma, poor biodegradability, etc.

Method used

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  • Preparation method of catalyst for ultraviolet catalytic wet-type oxidation
  • Preparation method of catalyst for ultraviolet catalytic wet-type oxidation
  • Preparation method of catalyst for ultraviolet catalytic wet-type oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of the catalyst of the present embodiment is carried out as follows:

[0027] (1) Accurately measure La(NO 3 ) 3 ·nH 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in a certain amount of distilled water to form a mixed solution with a solute mass concentration of 10%;

[0028] (2) Add citric acid (the molar ratio of citric acid to metal ion is 3:1) to the mixed solution and stir until completely dissolved to form a sol;

[0029] (3) drying at 90°C to form a gel;

[0030] (4) Grinding the gel through a 100-mesh sieve for subsequent use;

[0031] (5) Calcined at 700°C for 5h to obtain LaCoO 3 Perovskite type catalyst; The X-ray diffraction figure and the scanning electron microscope figure of gained catalyst are respectively as figure 1 and figure 2 shown.

[0032] Using the catalyst prepared in this example, a certain coal gasification membrane concentrate is used as the treatment object, and it is treated by ultraviolet-catalytic wet hydrogen perox...

Embodiment 2

[0036] The preparation of the catalyst of the present embodiment is carried out as follows:

[0037] (1) Accurately measure La(NO 3 ) 3 ·nH 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in a certain amount of distilled water to form a mixed solution with a solute mass concentration of 15%;

[0038] (2) Add citric acid (the molar ratio of citric acid to metal ion is 2:1) to the mixed solution and stir until completely dissolved to form a sol;

[0039] (3) drying at 100°C to form a gel;

[0040] (4) Grinding the gel through a 100-mesh sieve for subsequent use;

[0041] (5) Calcined at 800°C for 6h to obtain LaCoO 3 perovskite catalysts.

Embodiment 3

[0046] The preparation of the catalyst of the present embodiment is carried out as follows:

[0047] (1) Accurately measure La(NO 3 ) 3 ·nH 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in a certain amount of distilled water to form a mixed solution with a solute mass concentration of 20%;

[0048] (2) Add citric acid (the molar ratio of citric acid to metal ion is 3:2) to the mixed solution and stir until completely dissolved to form a sol;

[0049] (3) drying at 110°C to form a gel;

[0050] (4) Grinding the gel through a 100-mesh sieve for subsequent use;

[0051] (5) Calcined at 900°C for 7h to obtain LaCoO 3perovskite catalysts.

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Abstract

The invention relates to a preparation method of a catalyst for ultraviolet catalytic wet-type oxidation. The catalyst is a LaCoO3 perovskite catalyst formed by adopting La(NO3)3 and Co(NO3)2 as precursors and adopting citric acid as a complexing agent in a high-temperature calcining way by virtue of a sol-gel method. The catalyst can be sufficiently synergistic with the ultraviolet, under an acidic condition, the hydrogen peroxide is used as an oxidant to efficiently catalyze the oxidation of coal chemical waste water membrane concentrated solution at relatively low temperature and pressure,and the catalyst is controllable in structure, good in heat stability, recyclable, and high in environmental and economical benefits.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for ultraviolet catalytic wet oxidation, in particular to a method for preparing a catalyst that can be used for ultraviolet catalytic wet oxidation of coal chemical wastewater film concentrate. Background technique [0002] In order to meet the requirements of "zero discharge" in the coal chemical industry, membrane separation technology is often used in the advanced treatment unit of coal chemical wastewater. Membrane separation technology can selectively separate impurities in coal gasification wastewater at the molecular or ion level, but the essential function of membrane separation technology is to separate pollutants and cannot degrade them, so there will still be some pollutants in the process of treatment. amount of membrane concentrate. The membrane concentrate has the characteristics of high concentration of organic matter, large chroma, and poor biodegradability. How to effectivel...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/03B01J37/08C02F1/32C02F1/72
CPCC02F1/32C02F1/722C02F1/725B01J23/002B01J23/83B01J37/036B01J37/088B01J35/39
Inventor 刘志英徐炎华张永建滕月陆曦
Owner NANJING UNIV OF TECH
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