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Petal-shaped manganese-cerium composite oxide denitration catalyst and preparation method thereof

The technology of composite oxide and denitration catalyst is applied in the field of petal-shaped manganese-cerium composite oxide denitration catalyst and its preparation, which can solve the problems such as inability to meet emission requirements and achieve the effect of promoting adsorption

Active Publication Date: 2022-05-06
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Marine diesel engines can handle 50% of NO by relying on internal purification technology x , unable to meet the increasingly stringent emission requirements, so the off-machine purification technology has gradually become the future development direction

Method used

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  • Petal-shaped manganese-cerium composite oxide denitration catalyst and preparation method thereof
  • Petal-shaped manganese-cerium composite oxide denitration catalyst and preparation method thereof
  • Petal-shaped manganese-cerium composite oxide denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The manganese dioxide of the catalyzer that makes in embodiment 1, the mol ratio of ceria is 1:1, and its preparation method comprises the following steps:

[0029] (1) 0.4g manganese nitrate tetrahydrate, 0.4g cerium nitrate hexahydrate, 1g potassium permanganate and 36ml deionized water are mixed under stirring, wherein the stirring speed is at 300rpm / min, and the stirring time is 1.5h, and then The mixed solution was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 140°C for 12 hours;

[0030] (2) After cooling down to obtain a suspension, wash the suspension with deionized water for about 5 to 10 times, then centrifugally dry the suspension for 12 hours;

[0031] (3) Then heat up to 500°C in air atmosphere and keep for 6h.

[0032] The SEM figure of the catalyst that embodiment 1 makes is as figure 1 shown, from figure 1 It can be seen that the catalyst presents a petal-like structure after calcination.

Embodiment 2

[0034] The manganese dioxide of the catalyzer that makes in embodiment 2, the mol ratio of ceria is 5:1, and its preparation method comprises the following steps:

[0035] (1) 0.63g manganese nitrate tetrahydrate, 0.17g cerium nitrate hexahydrate, 1g potassium permanganate and 36ml deionized water are mixed under stirring, wherein the stirring speed is 300rpm / min, and the stirring time is 1.5h, and then The mixed solution was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 140°C for 12 hours;

[0036] (2) After cooling down to obtain a suspension, wash the suspension with deionized water for about 5 to 10 times, then centrifugally dry the suspension for 12 hours;

[0037] (3) Then heat up to 500°C in air atmosphere and keep for 6h.

Embodiment 3

[0039] Pack the catalysts prepared in Examples 1 and 2 into self-made quartz reaction tubes, feed mixed gas, and adjust the GHSV to 100,000 to 130,000 hours -1 During the test, the temperature was raised to test its activity; at each temperature point, a flue gas analyzer was used to detect its NO concentration, and a laughing gas detector was used to detect its N 2 O production.

[0040] The test system structure is as figure 2 shown.

[0041] image 3 is the NO catalytic activity of different ratios of manganese-cerium composite oxides.

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Abstract

The invention relates to a petal-shaped manganese-cerium composite oxide denitration catalyst and a preparation method thereof, and belongs to the field of catalyst technology and environmental protection. The catalyst has a petal-shaped structure and is composed of a manganese-cerium composite oxide. The preparation method of the catalyst comprises the following steps: (1) dissolving potassium permanganate, manganous nitrate hydrate and cerous nitrate hydrate in deionized water, uniformly stirring and mixing, then adding into a hydrothermal reaction kettle, reacting for 10-15 hours at the temperature of 130-160 DEG C, and then cooling; (2) washing and centrifuging the turbid liquid obtained in the step (1), and then drying; and (3) roasting the product obtained in the step (2) in an air atmosphere to obtain the manganese-cerium composite oxide denitration catalyst. The manganese-cerium composite oxide denitration catalyst prepared by a hydrothermal method has abundant active sites and acidic sites, has a petal-shaped structure, and is beneficial to providing more active sites so as to promote gas adsorption.

Description

technical field [0001] The invention relates to a petal-shaped manganese-cerium composite oxide denitrification catalyst and a preparation method thereof, which belong to the field of catalyst technology and environmental protection. Background technique [0002] At present, the nitrogen oxides emitted by ships powered by diesel engines have caused a series of pollution to the environment and caused serious harm to human health. Therefore, reducing the emission of nitrogen oxides is of great significance to environmental protection. Marine diesel engines can handle 50% of NO by relying on internal purification technology x , unable to meet the increasingly stringent emission requirements, so off-machine purification technology has gradually become the future development direction. Among them, NH 3 -SCR technology is widely used in the direction of ship exhaust denitrification because of its high denitrification efficiency, mature technology and convenient operation. The co...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/02B01J35/10B01D53/94B01D53/56B01D53/86
CPCB01J23/002B01J23/34B01D53/9413B01D53/8628B01J35/50B01J35/613
Inventor 王晓峰赵喆许洋
Owner DALIAN MARITIME UNIVERSITY
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