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High-dispersion manganese-cerium composite oxides and preparation method thereof

A composite oxide, manganese-cerium technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc. Effects of excellent reactivity and stability, stable properties, good redox and O2 affinity

Active Publication Date: 2009-06-24
SUZHOU IND PARK ANZEWEN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that manganese nitrate reacts with potassium permanganate to quickly form manganese oxide, but the reaction of manganese nitrate with ammonium cerium acid produces Ce III and the remaining Ce IV It is necessary to adjust the higher pH value by subsequent dropwise addition of KOH to precipitate, which cannot achieve a high degree of dispersion of manganese and cerium.

Method used

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  • High-dispersion manganese-cerium composite oxides and preparation method thereof
  • High-dispersion manganese-cerium composite oxides and preparation method thereof
  • High-dispersion manganese-cerium composite oxides and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Manganese-cerium composite oxide was prepared according to the following process

[0018] 1) According to the required ratio of manganese and cerium, configure a potassium permanganate, manganese acetate, cerium nitrate solution and a concentration of 0.2mol / L potassium hydroxide solution with a concentration of 0.1mol / L;

[0019] 2) Under the condition of vigorous stirring at 50°C, add the above solution dropwise, mix, and continue to stir for 1 hour after the dropwise addition is completed;

[0020] 3) The resulting precipitate was washed with hot water at 50°C, filtered with suction, and dried at 110°C for 8 hours. The obtained precursor was designated as S 1 . continue to S 1 The precursor was calcined at 500°C for 2 hours, and the obtained manganese-cerium composite oxide was denoted as S 2 .

[0021] from S 1 and S 2 Take an appropriate amount of samples for BET analysis, Raman spectral analysis and XRD analysis ( figure 1 ). BET analysis results showed th...

Embodiment 2

[0023] According to the steps in Example 1, a manganese-cerium composite oxide with a manganese-cerium ratio of 1:1 was prepared. Based on 0.25wt% Pt content, the manganese-cerium composite oxide was impregnated with dinitrosodiammine platinum solution, dried at 110°C, and activated for 2 hours after roasting at 450°C to obtain Pt-loaded manganese-cerium composite oxide Pt / MnCeOx .

[0024] 0.3g Pt / MnCeOx was placed in a quartz fixed catalytic reaction bed to evaluate the catalytic oxidation activity of formaldehyde at room temperature. The reaction temperature is 22°C, the relative humidity is 60%, the air flow rate is 3L / min, and the equivalent space velocity is about 400,000h -1 . At the same time, ordinary activated carbon (AC2) and expanded activated carbon (AC1) were used as comparison samples. Experimental results such as figure 2 shown. From figure 2 It can be seen that although activated carbon has a certain ability to eliminate formaldehyde, it mainly relies ...

Embodiment 3

[0026] According to the steps in Example 1, a manganese-cerium composite oxide with a manganese-cerium ratio of 3:1 was prepared. Take 0.3g MnCeOx and place it in a quartz fixed catalytic reaction bed for low temperature NH 3 Selective catalytic reduction of NOx(NH 3 -SCR) activity assessment. The reaction temperature is 50℃~200℃, NOx 500ppm, NH 3 500ppm, O 2 8%, H 2 O 5%, SO 2 0.1ppm, air speed 50,000h -1 . Experimental results such as image 3 shown. From image 3 It can be seen that the effect of MnCeOx on NH 3 -SCR has good low temperature activity. A NOx conversion rate of more than 70% can be achieved at around 60°C, and nearly 100% of NOx can be converted into N at a temperature above 80°C. 2 .

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Abstract

The invention discloses manganese-cerium composite oxide, which is prepared in one step through the oxidation reduction-precipitation process among Mn<VII>, Mn<II> and Ce<III> ions, wherein components, namely MnO2 and CeO2 of the manganese-cerium composite oxide have high dispersion on a near molecular scale, the mol ratio of Mn to Ce is randomly adjusted, and the composite oxide has good oxidation reduction and oxygen affinity. As a catalyst carrier of reactions of formaldehyde oxidation at room temperature and low-temperature selective catalytic reduction of nitrogen oxide, the use of the composite oxide can ensure that a catalyst has higher activity, and the stability of the composite oxide is more superior to those of other carriers.

Description

technical field [0001] The invention relates to a manganese-cerium composite oxide with high dispersibility and good oxidation-reduction properties, which can be used for catalytic oxidation (such as room temperature formaldehyde oxidation, VOCs catalytic combustion, VOCs wet oxidation) and medium and low temperature NOx selective catalytic reduction, etc. Catalysts or catalyst carriers for reactions. Background technique [0002] As a special catalyst or catalyst carrier, manganese-cerium composite oxide has been extensively studied at home and abroad for decades. According to what is known so far, manganese-cerium composite oxides have excellent performance in reactions such as catalytic combustion and wet oxidation. Compared with other materials, the use of manganese-cerium composite oxidation can greatly increase the activity of the catalyst in the above reaction, reduce the amount of high-cost active components such as noble metals, and obtain a longer service life. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/10
Inventor 柯锐康守方
Owner SUZHOU IND PARK ANZEWEN ENVIRONMENTAL PROTECTION TECH
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