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Preparation method of supported rare earth doped manganese dioxide (MnO2) used in ozone catalyst

A rare earth doping and catalyst technology is applied in the field of ozone decomposition catalyst and its preparation, which can solve the problems of high equipment requirements, high energy consumption, reduced particle dispersion and the like, and achieves the effects of broad application prospects and simple preparation process.

Active Publication Date: 2016-02-03
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 1mmol 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 5g of γ-Al in solution A obtained in step (1) 2 o 3 , heated to 65°C after stirring for 120 minutes;

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

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

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

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

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

[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 minutes, 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 supported rare earth doped manganese dioxide (MnO2) used in an ozone catalyst. The method comprises the following steps: taking gamma-Al2O3 as a carrier, taking MnO2 as an active constituent of the catalyst, and taking rare earth element as an additive, dissolving manganese sulfate and rare-earth metal nitrate in deionized water, adding isopropyl alcohol, stirring, mixing the carrier in the solution obtained after stirring, continuing stirring uniformly, heating, adding a KMnO4 solution, carrying out an in situ oxidation-reduction reaction on the surface of the carrier to obtain the rare earth doped MnO2 modified gamma-Al2O3. The method has the advantages that the preparation technology is simple; the catalyst is low in cost; the performance is stable; the ozonolysis efficiency is high; the application prospect is broad.

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 Applications(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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