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Potassium and manganese composite oxide and preparing method and application thereof to diesel vehicle tail gas purification

A technology for composite oxides and diesel vehicles, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as easy loss of K, weakened activity, and reduced lifespan , achieve the effects of cheap raw materials, lower light-off temperature and low cost

Inactive Publication Date: 2016-07-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, K in K-containing catalysts mainly exists in two forms, one is free K ions, but this kind of K is easy to lose, resulting in weakened activity and reduced lifespan
Another kind of K exists in the form of fixed K, but this kind of catalyst has insufficient activity due to the excessive fixation of K

Method used

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  • Potassium and manganese composite oxide and preparing method and application thereof to diesel vehicle tail gas purification
  • Potassium and manganese composite oxide and preparing method and application thereof to diesel vehicle tail gas purification
  • Potassium and manganese composite oxide and preparing method and application thereof to diesel vehicle tail gas purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Accurately weigh 1.3521gMnSO 4 ·H 2 O, 1.8526g(NH 4 ) 2 S 2 O 8 ,1.9821g(NH 4 ) 2 SO 4 , Put in a 100mL beaker, add 40mL deionized water, stir and dissolve for 20min to obtain a mixed solution; then accurately weigh the KNO 3 3.2353g, added to the mixed solution under vigorous stirring, and stirred and dissolved for 30 minutes to obtain a clear mixed solution; transfer the mixed solution to a polytetrafluoroethylene liner, seal, and move it into a stainless steel reactor. The reaction kettle was hydrothermally aged at 120°C in an oven for 20 hours, cooled naturally to room temperature, and the kettle was opened. The reaction product was washed with deionization and suction filtered. The product was dried at 120°C for 12 hours to obtain potassium manganese composite oxide.

[0033] figure 1 Is the XRD spectrum of the obtained product. It can be seen from the figure that the catalyst meets the K 2-x Mn 8 O 16 This type of composite oxide has a tunnel structure.

Embodiment 2

[0035] Accurately weigh 1.3521gMnSO 4 ·H 2 O, 1.8526g(NH 4 ) 2 S 2 O 8 ,1.9821g(NH 4 ) 2 SO 4 , Put in a 100mL beaker, add 20mL deionized water, stir and dissolve for 20min to obtain a mixed solution; then accurately weigh the KNO 3 0.4044g, added to the mixed solution under vigorous stirring, and stirred and dissolved for 30 minutes to obtain a clear mixed solution; transfer the mixed solution to a polytetrafluoroethylene lining, seal, and move it into a stainless steel reactor. The reaction kettle was hydrothermally aged at 120°C for 20 hours in an oven, naturally cooled to room temperature, and the kettle was opened. The reaction product was washed with deionization, suction filtered, and dried at 120°C for 12 hours to obtain potassium manganese composite oxide. The molecular formula of the resulting product is K 2-x Mn 8 O 16 , Has a tunnel structure. The XRD pattern of the resulting product and figure 1 similar.

Embodiment 3

[0037] Accurately weigh 1.3521gMnSO 4 ·H 2 O, 1.8526g(NH 4 ) 2 S 2 O 8 ,1.9821g(NH 4 ) 2 SO 4 , Put in a 100mL beaker, add 40mL deionized water, stir and dissolve for 10min to obtain a mixed solution; then accurately weigh the KNO 3 1.6176g, added to the mixed solution under vigorous stirring, and stirred and dissolved for 30 minutes to obtain a clear mixed solution; transfer the mixed solution to a polytetrafluoroethylene lining, seal, and move it into a stainless steel reactor. The reaction kettle was hydrothermally aged at 200°C for 12 hours in an oven, cooled to room temperature naturally, and the kettle was opened. The reaction product was washed with deionization, suction filtered, and dried at 120°C for 10 hours to obtain potassium manganese composite oxide. The molecular formula of the resulting product is K 2-x Mn 8 O 16 , Has a tunnel structure. The XRD pattern of the resulting product and figure 1 similar.

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Abstract

The invention discloses potassium and manganese composite oxide and a preparing method and application thereof to diesel vehicle tail gas purification.The molecular formula of the composite oxide is K2-xMn8O16, wherein 0<x<2.The potassium and manganese composite oxide is of a special tunnel structure, potassium is located in a tunnel of the composite oxide and not prone to loss, initiation temperature of soot can be reduced substantially, soot combustion is effectively catalyzed, the composite oxide can serve as a catalyst for catalyzing soot combustion, a diesel particulate filter (DPF) can be regenerated well, and the purpose of eliminating soot on the working condition of a diesel vehicle can be achieved by using the potassium and manganese composite oxide.

Description

technical field [0001] The present invention relates to a potassium-manganese composite oxide material with a tunnel structure and a preparation method thereof, and also relates to the application of the potassium-manganese composite oxide in the purification of diesel vehicle exhaust, which can reduce the initial combustion temperature of soot and catalyze the removal of diesel The invention relates to soot particles in vehicle exhaust, which belongs to the technical field of catalytic purification of diesel vehicle exhaust. Background technique [0002] Since 2013, many cities in my country have been hit by severe smog several times, among which the smog weather in Beijing reached 145 days in 2013. The formation of haze is closely related to PM2.5 emitted by motor vehicles, among which soot particles emitted by diesel vehicles are an important source of PM2.5. Relevant studies have proved that installing a wall-flow cordierite / SiC ceramic particulate filter (Diesel Partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34F01N3/023
CPCB01J23/002B01J23/34F01N3/023
Inventor 张昭良田广凯李倩吕晨曦辛颖
Owner UNIV OF JINAN
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