Low-temperature SCR manganese oxide catalyst as well as preparation method and application thereof

A manganese oxide and catalyst technology, which is applied in the field of low-temperature SCR manganese oxide catalyst and its preparation, can solve the problem of low low-temperature activity and achieve the effects of simple process, good low-temperature SCR denitrification activity, and convenient control

Active Publication Date: 2018-11-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect of low-temperature activity of traditional vanadium-based catalysts in the prior art in the denitrification of automobile tail gas, and to provide a preparation method of low-temperature SCR manganese oxide catalyst

Method used

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  • Low-temperature SCR manganese oxide catalyst as well as preparation method and application thereof
  • Low-temperature SCR manganese oxide catalyst as well as preparation method and application thereof
  • Low-temperature SCR manganese oxide catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a low-temperature SCR manganese oxide catalyst. Prepared by the following method.

[0033] Add sodium permanganate to 80mL of distilled aqueous solution, add hydrochloric acid to adjust the hydrogen ion concentration of the solution to 0.2mol / L (the molar ratio of sodium permanganate to hydrogen ion concentration is equal to 1), and stand at 80°C for reaction 6h, the resulting product was filtered, washed and then dried to obtain manganese dioxide. Then the manganese dioxide was calcined at 400° C. for 3 hours to obtain the manganese oxide catalyst.

[0034] The above-mentioned manganese oxide is characterized, and its XRD diffraction pattern is as follows figure 1 shown. We know that manganese oxide before calcination and δ-MnO indicated by JCPDF standard card PDF#43-1456 2 Correspondingly, but after calcination at 400 °C, the XRD crystal form collapsed unexpectedly, forming an amorphous structure. figure 2 Scanning electron micrographs o...

Embodiment 2

[0038] This embodiment provides a low-temperature SCR manganese oxide catalyst. Prepared by the following method.

[0039] Add sodium permanganate to 80mL of distilled aqueous solution, add hydrochloric acid to adjust the hydrogen ion concentration of the solution to 0.2mol / L (the molar ratio of sodium permanganate to hydrogen ion concentration is 1.2), and stand at 80°C for reaction After 48 hours, the obtained product was filtered, washed and then dried to obtain manganese dioxide. Then the manganese dioxide was calcined at 300° C. for 3 h to obtain the manganese oxide catalyst. After testing, its XRD and SEM are similar to Example 1.

Embodiment 3

[0041] This embodiment provides a low-temperature SCR manganese oxide catalyst. Prepared by the following method.

[0042]Add sodium permanganate to 80mL of distilled aqueous solution, add sulfuric acid to adjust the hydrogen ion concentration of the solution to 0.2mol / L (the molar ratio of sodium permanganate to hydrogen ion concentration is 1.2), and stand at 40°C for reaction After 48 hours, the obtained product was filtered, washed and then dried to obtain manganese dioxide. Then the manganese dioxide was calcined at 300° C. for 5 h to obtain the manganese oxide catalyst. After testing, its XRD and SEM are similar to Example 1.

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Abstract

The invention relates to a low-temperature SCR manganese oxide catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: S1: adding acid into a sodium permanganate solution, adjusting the concentration of hydrogen ions to be 0.06 to 0.4 mol/L, standing, filtering, washing, drying, and obtaining manganese dioxide; and S2: calcining the manganese dioxide at 300 to 400 DEG C, thus obtaining a manganese oxide catalyst. The preparation method provided by the invention is simple in process, convenient to control, high in yield, and easy in industrialized popularization and application; and the prepared manganese oxide catalyst is of a non-crystal form structure, can be used as a low-temperature SCR catalyst, and has good low-temperature SCR denitration activity and wide temperature window, the conversion rate at 150 DEG C is 90 percent, and the conversion rate in the temperature range of 150 to 250 DEG C is kept at 90 percent or above.

Description

technical field [0001] The invention belongs to the field of material synthesis, and in particular relates to a low-temperature SCR manganese oxide catalyst and its preparation method and application. Background technique [0002] The combustion of coal, fossil fuels, and motor vehicle exhaust all contain large amounts of nitrogen oxides (NO x ). NO x It is one of the causes of smog, and it can also cause acid rain, holes in the ozone layer, photochemical smog, etc., which seriously endanger human health. Selective catalytic reduction (Selective Catalytic Reduction, SCR) is the elimination of NO x one of the most effective techniques. The technology is generally referred to as NH 3 As a reducing agent, under the action of catalyst, NO x Revert to N 2 . [0003] Traditional vanadium-based catalysts (V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -MoO 3 / TiO 2 ) is the most common SCR catalyst. It generally has good denitrification activity and selectivity at 300~400°C, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34C01G45/02B01D53/94B01D53/56
CPCB01D53/9413B01D2255/20723B01D2255/2073B01D2257/404B01D2258/01B01J23/34C01G45/02
Inventor 余林杨润农蓝邦韩佳锡孙明赵向云何彬彬穆杨
Owner GUANGDONG UNIV OF TECH
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