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A preparation method of supported rare earth doped manganese oxide for ozone catalyst

A rare earth doping and catalyst technology, which is applied in the oxidation water/sewage treatment, textile industry wastewater treatment and other directions, can solve the problems of high equipment requirements, high energy consumption, reduced particle dispersion, etc., and achieves a simple preparation process and wide application. Foreground effect

Active Publication Date: 2018-04-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the high-temperature sintering process, the active components dispersed on the surface of the carrier will aggregate to reduce the particle dispersion, which reduces the activity of the catalyst to a certain extent. At the same time, high-temperature calcination requires high equipment and high energy consumption, which is not conducive to industry promotion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh 1 mmol of MnSO 4 ·H 2 O was dissolved in 10 mL of deionized water, and then 40 mL of isopropanol was added to prepare solution A;

[0017] (2) Add 5 g of γ-Al to solution A obtained in step (1) 2 o 3 , heated to 65 °C after stirring for 120 min;

[0018] (3) Weigh 1mmol of KMnO 4 , dissolved in 10 mL of deionized water, then added to the mixed solution prepared in step 2, reacted for 2 h and stopped the reaction;

[0019] (4) Filter, wash and dry the product obtained in step 3 to obtain the modified γ-Al 2 o 3 sample.

[0020] The sample prepared in this example was used for ozone catalytic oxidation treatment of printing and dyeing wastewater. When the residence time was 60 min, the COD of import and export printing and dyeing wastewater was measured after the reaction was stable. The removal rate of COD was 81.2%, and the effluent was colorless and odorless.

Embodiment 2

[0022] (1) Weigh 1 mmol of MnCl 2 4H 2 O and 0.1mmol La(NO 3 ) 3 ·6H 2 O. Dissolve in 10mL deionized water, then add 40mL isopropanol to prepare solution A;

[0023] (2) Add 5 g of γ-Al to solution A obtained in step (1) 2 o 3 , heated to 75 °C after stirring for 120 min;

[0024] (3) Weigh 1mmol of KMnO 4 , dissolved in 10 mL of deionized water, then added to the mixed solution prepared in step 2, reacted for 4 h and stopped the reaction;

[0025] (4) Filter, wash and dry the product obtained in step 3 to obtain the modified γ-Al 2 o 3 sample.

[0026] The sample prepared in this example was used for ozone catalytic oxidation treatment of printing and dyeing wastewater. When the residence time was 60 min, the COD of import and export printing and dyeing wastewater was measured after the reaction was stable. The removal rate of COD was 99.6%, and the effluent was colorless and odorless.

Embodiment 3

[0028] (1) Weigh 1 mmol of MnCl 2 4H 2 O and 0.1mmol Ga(NO 3 ) 3 ·6H 2 O. Dissolve in 10mL deionized water, then add 40mL isopropanol to prepare solution A;

[0029] (2) Add 5 g of γ-Al to solution A obtained in step (1) 2 o 3 , heated to 75 °C after stirring for 120 min;

[0030] (3) Weigh 1mmol of KMnO 4 , dissolved in 10 mL of deionized water, then added to the mixed solution prepared in step 2, reacted for 4 h and stopped the reaction;

[0031] (4) Filter, wash and dry the product obtained in step 3 to obtain the modified γ-Al 2 o 3 sample.

[0032] The sample prepared in this example was used for ozone catalytic oxidation treatment of printing and dyeing wastewater. When the residence time was 60 min, the COD of import and export printing and dyeing wastewater was measured after the reaction was stable. The removal rate of COD was 92.3%, and the effluent was colorless and odorless.

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PUM

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Abstract

The invention discloses a preparation method of a supported rare earth-doped manganese oxide for ozone catalyst. The method uses γ-Al2O3 as a carrier, manganese oxide as an active component of the catalyst, rare earth element as an auxiliary, and sulfuric acid is used as an auxiliary agent. Manganese and rare earth metal nitrate are dissolved in deionized water, isopropanol is added, stirred, the carrier is mixed in the above solution, stirred evenly, heated, and then added with KMnO4 solution, the surface of the carrier is in situ redox reaction to obtain rare earth doped MnO2 modification γ‑Al2O3. The advantages of the method are that the preparation process is simple, the catalyst cost is low, the performance is stable, the ozone decomposition efficiency is high, and the method has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of ozonolysis catalysts, in particular to an ozonolysis catalyst and a preparation method thereof. Background technique [0002] MnO 2 Due to the advantages of environmental friendliness, abundant resources, and low price, it is a multifunctional transition metal oxide that has been widely studied, and has very broad application prospects in the fields of battery electrode materials and ozone catalysts. Especially as an ozone catalyst, because manganese ions can promote the decomposition of ozone to generate active free radicals, enhance its oxidation, and greatly improve the utilization rate of ozone. Among all transition metal oxides, MnO 2 Its catalytic activity is recognized as the best, and it can effectively catalyze the degradation of the most types of organic matter. [0003] However, the effective utilization rate of the simple catalyst itself is low, and the decomposition efficiency of the ozone ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34C02F1/78C02F103/30
Inventor 何丹农葛美英林琳卢静尹桂林
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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