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Manganese oxide catalyst, and preparation method and application thereof

A manganese oxide and catalyst technology, applied in the field of manganese oxide catalyst preparation, can solve the problems of high light-off temperature, complicated preparation method, etc., and achieve the effects of less pollution, environmental friendliness, and simple and fast preparation process

Active Publication Date: 2020-03-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of manganese-based oxides in the prior art is cumbersome and the ignition temperature is relatively high

Method used

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  • Manganese oxide catalyst, and preparation method and application thereof
  • Manganese oxide catalyst, and preparation method and application thereof
  • Manganese oxide catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of MnO(1x1) catalyst:

[0035] Accurately weigh 3.93g (NH 4 ) 2 S 2 o 8 and 2.91g MnSO 4 ·H 2 O was respectively dissolved in 70mL deionized water. After ultrasonic dispersion, the manganese sulfate solution was added dropwise to the ammonium persulfate solution with a constant pressure dropping funnel, and stirred while adding. After the solution was uniformly mixed, it was transferred to a high-pressure reaction kettle. , reacted at 140°C for 12h, cooled to room temperature, separated by filtration, washed with distilled water, dried at 80°C, and then calcined at 400°C for 4h in an air atmosphere in a muffle furnace to obtain MnO (1x1) catalyst.

Embodiment 2

[0037] Preparation of MnO(2x2) catalyst

[0038] Accurately weigh 1.24g MnSO 4 ·H 2 O and 0.83 g KMnO 4 Dissolve in 20mL deionized water respectively. After ultrasonic dispersion, the manganese sulfate solution was added dropwise to the potassium permanganate solution with a constant pressure dropping funnel, and stirred while adding. After the solution was uniformly mixed, it was transferred to a high-pressure reactor. Reacted at 160°C for 24h, cooled to room temperature, separated by filtration, washed with distilled water, dried at 80°C, and then calcined at 400°C for 4h in an air atmosphere in a muffle furnace to prepare the MnO(2x2) catalyst.

Embodiment 3

[0040] Preparation of MnO(3x3) catalyst

[0041] a) Accurately weigh 3.96g MnCl·H2 O and 1.63g MgCl 6H 2 O was respectively dissolved in 20mL deionized water, and after ultrasonic dispersion, the manganese chloride solution was added dropwise to the magnesium chloride solution with a constant pressure dropping funnel, and stirred while adding;

[0042] b) Accurately weigh 10.00g of NaOH and dissolve it in 50mL of deionized water, and add it dropwise to the above solution;

[0043] c) Accurately weigh 1.26g KMnO 4 After dissolving in 40ml deionized water, sonicate for 10min, add dropwise to b), stir at room temperature for 30min, and let stand for aging for 48h;

[0044] d) 1L 1mol / L MgCl 2 The solution was dropped into the mixed solution of step c), stirred at room temperature for 10 h, then transferred to an autoclave, reacted at 150 ° C for 48 h, cooled to room temperature, separated by filtration, washed with distilled water, dried overnight at 110 ° C, and then placed i...

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Abstract

The invention discloses a manganese oxide catalyst, and a preparation method and an application thereof, and belongs to the technical field of preparation of manganese oxide catalysts. The morphologyof the manganese oxide catalyst is a nanorod, a nanowire and a nanosheet, and the crystal forms of the manganese oxide catalyst are pyrolusite, cryptomelane and pyrolusite respectively. The catalyst of each crystal form is prepared from different raw materials through hydrothermal reaction and calcination. The used raw materials are cheap and easily available, and are rich in resources, and the preparation method has the advantages of simplicity, quickness, realization of large-scale production, low energy consumption, small pollution and environment friendliness. The catalyst has the advantages of high DOC reaction activity on diesel vehicles, low ignition temperature, and excellent potential in the diesel engine tail gas post-treatment application.

Description

technical field [0001] The invention belongs to the technical field of manganese oxide catalyst preparation, and in particular relates to a manganese oxide catalyst and its preparation method and application. Background technique [0002] Diesel vehicle engines are widely used due to reduced CO2 emissions, higher fuel efficiency, better reliability and durability. However, diesel vehicle engines emit many harmful pollutants including NOx, CO and unburned hydrocarbons (CxHy). Due to lean-burn-rich-oxygen conditions, conventional three-way catalysts (TWC) cannot meet the requirements of diesel engine exhaust systems to meet increasingly stringent government laws and regulations. Therefore, more and more researches focus on the aftertreatment system of diesel vehicle exhaust. [0003] Diesel Oxidation Catalysis (DOC) is currently one of the most critical technologies for treating diesel vehicle exhaust. It has a series of functions, such as: oxidizing CO and CxHy into non-tox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/04B01D53/94B01D53/72B01D53/56B01D53/62
CPCB01J23/34B01D53/945B01J35/56Y02T10/12
Inventor 董林王鑫高飞
Owner NANJING UNIV
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