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Method for preparing double-component metallic oxide catalytic ozonation catalyst

An ozone catalytic oxidation, two-component technology, applied in the direction of oxidized water/sewage treatment, etc., to achieve the effect of wide range of raw materials, low production cost, good mechanical properties and stability

Inactive Publication Date: 2013-02-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cerium oxide is a catalyst with good catalytic performance. Under redox conditions, it can pass Ce 3+ and Ce 4+ The conversion of oxygen to realize the storage and release of oxygen, the study found that manganese atoms can enter the lattice oxygen structure of cerium, thereby improving the oxygen storage capacity of cerium and the transport capacity of surface oxygen, this synergistic effect makes the manganese cerium composite catalyst have Higher catalytic activity, there is no report on the use of manganese-cerium composite catalysts for ozone catalytic oxidation

Method used

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  • Method for preparing double-component metallic oxide catalytic ozonation catalyst
  • Method for preparing double-component metallic oxide catalytic ozonation catalyst
  • Method for preparing double-component metallic oxide catalytic ozonation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 44.75 ml of 50% Mn(NO 3 ) 2 solution (0.125 mol / L) and 5.43 g Ce(NO 3 ) 3 ·6H 2 O (molar ratio of manganese to cerium is 10:1), mixed with water, dissolved and diluted to 1 L, slowly added 500 g of activated γ-Al 2 o 3 Microspheres, impregnated overnight, then removed γ-Al 2 o 3 The microspheres were dried at 100±2 °C, placed in a muffle furnace and calcined at 450 °C for 4 h to obtain a manganese-cerium dual-component supported catalyst.

[0023] Prepare the above concentrations of Mn(NO 3 ) 2 solution and Ce(NO 3 ) 3 solution, and operate according to the above process, the manganese and cerium single-component supported catalysts can be obtained respectively.

[0024] The performance of the catalyst was evaluated by the ozone catalytic degradation experiment: carried out in a plexiglass reactor, the volume of the reactor was 1 L, ozone was provided by a WH-X ozone generator, and the ozone concentration was 5 g / h, and the ozone was passed through aerat...

Embodiment 2

[0029] Take 53.70 ml of 50% Mn(NO 3 ) 2 solution (0.15 mol / L) and 6.51 g Ce(NO 3 ) 3 ·6H 2 O (manganese-cerium ratio 10:1) was mixed, and other preparation steps were as in Example 1. The performance evaluation method of the prepared catalyst was the same as in Example 1, except that the reaction was carried out for 30 minutes, and the COD value was measured by sampling. The evaluation results are shown in Table 1

Embodiment 3

[0031] Get 71.60ml mass fraction 50% Mn(NO 3 ) 2 solution (0.2mol / L) and 8.69 g Ce(NO 3 ) 3 ·6H 2 O (manganese-cerium ratio 10:1) was mixed, and other preparation steps were as in Example 1. The performance evaluation method of the prepared catalyst is the same as in Example 2, and the evaluation results are shown in Table 1.

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Abstract

The invention relates to a method for preparing a double-component metallic oxide catalytic ozonation catalyst. The method is characterized in that, after being activated, gamma-Al2O3 microballoon is soaked in mixed liquor of manganous nitrate and cerous nitrate, and then after drying and roasting, the loading type manganese and cerium double-component composite catalyst is prepared. The catalyst has high catalytic activity, is applied in organic pollutant degradation through catalytic ozonation, remarkably fastened in degradation rate compared with degradation using ozone singly or using unloaded gamma-Al2O3 microballoon, greatly improved compared with loading catalyst using single component of manganese or cerium and capable of reducing input amount of ozone, and according saves operation cost. Simultaneously, the catalyst has the advantages of being simple in preparing method, low in cost, stable in catalytic performance, capable of being repeatedly used and the like and is favorable for popularization and application of the catalytic ozonation technology.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a γ-Al 2 o 3 The invention discloses a preparation method of a supported two-component ozone catalytic oxidation catalyst with microspheres as the carrier and active components of manganese oxide and cerium oxide. Background of the invention [0002] Ozone has strong oxidizing properties, can oxidize almost all organic pollutants in water, and can decompose itself in water for a short time without causing secondary pollution, but it has high cost, low solubility in water, and incomplete oxidation of organic matter. its application in the field of water treatment. [0003] Heterogeneous catalytic ozonation is an emerging advanced oxidation technology, which generates more oxidative hydroxyl radicals by catalyzing ozonolysis, which can degrade and completely mineralize organic pollutants in water that are difficult to be oxidized by ozonation alone. The core of this...

Claims

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Application Information

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IPC IPC(8): B01J23/34C02F1/78
Inventor 杨凤林吴宗蔚陈捷王国文张国权徐晓晨
Owner DALIAN UNIV OF TECH
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