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Samarium-doped MnOx low-temperature SCR (Selective Catalytic Reduction) catalyst as well as preparation method and application thereof

An SCR catalyst and low temperature technology, applied in the field of catalysts, can solve the problems of complex preparation process and narrow catalytic reaction temperature window, and achieve the effects of simple process, wide reaction temperature window and good catalytic performance.

Inactive Publication Date: 2017-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic reaction temperature window is narrow and the preparation process is complicated

Method used

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  • Samarium-doped MnOx low-temperature SCR (Selective Catalytic Reduction) catalyst as well as preparation method and application thereof
  • Samarium-doped MnOx low-temperature SCR (Selective Catalytic Reduction) catalyst as well as preparation method and application thereof
  • Samarium-doped MnOx low-temperature SCR (Selective Catalytic Reduction) catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 0.05Sm-MnO x The preparation of catalyst, concrete steps are as follows:

[0037] 10.1636g (0.0400mol) Mn(CHCOO) 2 4H 2 O and 0.6727g (0.0020mol) Sm(NO 3 ) 3 ·6H 2 Dissolve O in deionized water respectively, mix, stir constantly and add 0.2mol / L sodium carbonate drop by drop, adjust the pH to 9.0, then continue to stir with a magnetic stirrer at room temperature for 24h, then filter, collect the precipitate, and store in an oven Dry at 120°C for 12 hours, grind in a mortar, and sieve 40-60 mesh powder to obtain 0.05Sm-MnO x Low temperature SCR catalyst.

[0038] The 0.05Sm-MnO prepared in this embodiment x XRD pattern of low temperature SCR catalystfigure 1 As shown, it can be seen that 0.05Sm-MnO x The crystallinity of the catalyst is poor, with weak Mn 2 o 3 and Mn 3 o 4 Most of the phases exist in an amorphous state. It shows that samarium interacts with manganese oxides, and the doping of samarium affects the nucleation process of manganese oxides, inhi...

Embodiment 2

[0045] 0.07Sm-MnO x The preparation of catalyst, concrete steps are as follows:

[0046] 10.1636g (0.040mol) Mn(CHCOO) 2 4H 2 O and 0.9431g (0.0028mol) Sm(NO 3 ) 3 ·6H 2 Dissolve O in deionized water respectively, mix, stir constantly and add 0.2mol / L sodium carbonate drop by drop, adjust the pH to 9.0, then continue to stir with a magnetic stirrer at room temperature for 24h, then filter, collect the precipitate, and store in an oven Dry at 120°C for 12 hours, grind in a mortar, and sieve 40-60 mesh powder to obtain 0.07Sm-MnO x Low temperature SCR catalyst.

[0047] The 0.07Sm-MnO prepared in this embodiment x XRD pattern of low temperature SCR catalyst figure 1 As shown, it can be seen that 0.07Sm-MnO x The diffraction peaks of the catalyst basically disappeared, and it can be seen that the crystallinity is very poor, and most of them exist in an amorphous state. It shows that there is a strong interaction between samarium and manganese oxides, and the doping of s...

Embodiment 3

[0051] 0.10Sm-MnO x The preparation of catalyst, concrete steps are as follows:

[0052] 10.1636g (0.04mol) Mn(CH 3 COO) 2 4H 2 O and 1.3454g (0.004mol) Sm(NO 3 ) 3 ·6H 2 Dissolve O in deionized water, mix, stir constantly and add 0.2mol / L sodium carbonate drop by drop, adjust the pH to 9.0, then continue to stir with a magnetic stirrer at room temperature for 24h, then filter, collect the precipitate, and place in an oven Dry at 120°C for 12 hours, grind in a mortar, and sieve 40-60 mesh powder to obtain 0.10Sm-MnO x Low temperature SCR catalyst.

[0053] Compared with Example 1, this example changes the molar ratio of the samarium-manganese precursor, and the molar ratio of samarium-manganese is 0.10:1.

[0054] BET analysis (Table 1) showed that 0.10Sm-MnO x The catalyst has a small specific surface area of ​​112m 2 g -1 , the pore volume is also smaller, while the pore diameter is larger.

[0055] For the 0.10Sm-MnO prepared in this embodiment x The low-temper...

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Abstract

The invention relates to a samarium-doped MnOx low-temperature SCR (Selective Catalytic Reduction) catalyst as well as a preparation method and application thereof. A proper amount of rare-earth metal samarium is doped into a manganese-based catalyst to obtain the samarium-doped MnOx low-temperature SCR catalyst; compared with a single manganese-based catalyst, the specific surface area of the catalyst is enlarged and the grain diameter of MnOx is reduced; the dispersity of manganese oxide in the catalyst is improved, and reaction activity of the MnOx at low temperature is effectively facilitated; an SCR denitration activity temperature window is expanded, and a modification effect on an MnOx catalyst is very good; the samarium-doped MnOx low-temperature SCR catalyst has relatively high catalytic activity at the low temperature.

Description

technical field [0001] The invention belongs to the field of catalysts and relates to a samarium-doped MnO x A low-temperature SCR catalyst, a preparation method thereof, and an application in low-temperature removal of nitrogen oxides from automobile exhaust. Background technique [0002] NO x It is the general term for various nitrogen oxides, mainly NO, NO 2 and N 2 O, of which NO accounts for about 95%. NO x Mainly the car engine in the combustion process N 2 and O 2 The emission concentration of the product reacted at high temperature is generally 300-1000ppm. Therefore, reducing the emission of nitrogen oxides in automobile exhaust is a breakthrough in controlling air pollution. [0003] Selective catalytic reduction (SCR) is currently the most widely used and most efficient method for removing NO from automobile exhaust. x The most widely used catalysts are vanadium-based catalysts. However, the operating temperature range of vanadium-based catalysts is narr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/94B01D53/56
CPCB01D53/9418B01J23/10B01J23/34B01J2523/00B01J2523/3737B01J2523/72Y02A50/20
Inventor 杨梅君马艳娇涂溶章嵩张联盟
Owner WUHAN UNIV OF TECH
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