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Manganese-based oxide catalyst with wide temperature window and preparation method thereof

A manganese-based oxide and window manganese-based technology is applied in the field of preparation of manganese-cerium-tungsten oxide catalysts for catalyzing and purifying nitrogen oxides. Performance, effect of excellent N2 generation selectivity

Inactive Publication Date: 2017-03-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yang Shijian and others found that MnO x -CeO 2 The catalyst inevitably has disadvantages, the main disadvantage being that it is very sensitive to temperature, and the activity decreases rapidly in the temperature range above 175 °C

Method used

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  • Manganese-based oxide catalyst with wide temperature window and preparation method thereof
  • Manganese-based oxide catalyst with wide temperature window and preparation method thereof
  • Manganese-based oxide catalyst with wide temperature window and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0029] According to the Mn:Ce:W molar ratio of 3:1:0.1, dissolve ammonium tungstate in oxalic acid, stir continuously until the ammonium tungstate is completely dissolved, then add manganese nitrate and cerium nitrate to the solution, and add manganese source, cerium 18 times the total moles of tungsten source and tungsten source as precipitating agent, then heated to 90°C and continuously stirred for 12h, then filtered and washed, put the obtained solid in an oven and dried at 100°C for 12h, and finally passed through muffle The catalyst was calcined in air at 500°C for 5 hours to obtain a powdered catalyst, called catalyst B.

Embodiment 3

[0031] Other conditions were unchanged as in Example 2, and the molar ratio of manganese, cerium, and tungsten was changed to 3:1:0.3 to obtain catalyst C.

Embodiment 4

[0033] Other conditions were unchanged as in Example 2, and the molar ratio of manganese, cerium, and tungsten was changed to 3:1:0.5 to obtain catalyst D.

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PUM

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Abstract

The invention discloses a manganese-based oxide catalyst for catalytic purification of nitrogen oxide and a preparation method thereof. The preparation method comprises the following steps: preparing a Mn3CeW0.3Ox composite oxide by using a uniform precipitation method and then carrying out roasting so as to obtain the (MnOx)3-CeO2-(WO3)0.3 oxide catalyst. According to the invention, the manganese-based oxide catalyst with the characteristics of a wide temperature window, excellent resistance to water and sulfur, high N2 generation selectivity, high-temperature resistance, heat stability and the like is prepared from nontoxic and harmless raw materials by using the simple and easily practicable method; and the prepared manganese-based oxide catalyst is applicable to a nitrogen oxide catalytic purification apparatus with flue gas of a coal-fired power plant as a representative fixed source and tail gas of a diesel car as a representative movable source.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a manganese-cerium-tungsten oxide catalyst for catalytic purification of nitrogen oxides, a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 ) is an important air pollutant that poses a serious threat to the environment, causing environmental problems such as the greenhouse effect, acid rain, and photochemical smog. NO x It not only seriously damages the atmospheric environment, but also poses a serious threat to human health to a certain extent, especially has a strong stimulating effect on respiratory organs, which may cause asthma, emphysema and other diseases. Therefore, controlling NO x The emission of emissions is imperative and urgent. [0003] In order to reduce the harm of nitrogen oxides emitted by industry to the environment, many studies have been carried out on combusti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/34B01J2523/00B01J2523/3712B01J2523/69B01J2523/72
Inventor 陈晓玲耿阳单文坡胡婕妤程虹谷青青杨士建
Owner NANJING UNIV OF SCI & TECH
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