Macroporous composite metal oxide catalyst for purifying soot of diesel and preparation method thereof

A technology for oxidation catalysts and composite metals, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. High combustion temperature, small catalyst pores and other problems, to achieve the effect of improving catalytic activation efficiency, lowering combustion temperature and improving utilization rate

Inactive Publication Date: 2010-03-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN1139428C discloses several non-precious metal series catalysts for catalyzing diesel soot combustion, mainly LaCoO doped with alkali metals 3 Perovskite and CuFe 2 o 4 Composed of spinel composite metal oxide, the above catalyst can reduce the combustion temperature of soot particles by 160-180°C, but the combustion temperature of soot particles is still above 400°C
[0016] Adopt above-mentioned method, although can prepare and obtain the catalyst with larger specific surface area, but the pores inside the catalyst are all small, and its utilization rate is relatively low, cause the overall active specific surface area utilization rate of catalyst to also be relatively low, utilize the above-mentioned method to prepare When the catalyst is used to treat the soot particles, the combustion temperature of the soot particles is still relatively high

Method used

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  • Macroporous composite metal oxide catalyst for purifying soot of diesel and preparation method thereof
  • Macroporous composite metal oxide catalyst for purifying soot of diesel and preparation method thereof
  • Macroporous composite metal oxide catalyst for purifying soot of diesel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Example 1 Large Pore La 0.9 K 0.1 FeO 3 Perovskite composite oxide catalyst

[0054] Weigh lanthanum nitrate, potassium nitrate and ferric nitrate according to the stoichiometric ratio, dissolve them in ethylene glycol, add an appropriate amount of methanol (the volume fraction of methanol is 5-50%) to obtain a mixed solution, wherein the total amount of metal ions in the mixed solution The concentration is 0.5-3.0mol / L, after reaction, the macroporous composite metal oxide catalyst La 0.9 K 0.1 FeO 3 precursor solution. Take a small amount of the precursor solution in a crucible, directly place the crucible in a muffle furnace and bake at 650°C for 5 hours to obtain La 0.9 K 0.1 FeO 3 Perovskite type composite metal oxide, cooled for standby.

[0055] Figure 1a and Figure 1b Respectively La prepared in this example 0.9 K 0.1 FeO 3 Scanning electron microscope (SEM) photographs of different magnifications. It can be seen from the figure that La 0.9 K 0...

Embodiment 2

[0061] Example 2 Large Pore La 0.9 K 0.1 CoO 3 Perovskite composite oxide catalyst

[0062] Weigh lanthanum nitrate, potassium nitrate, and cobalt nitrate according to the stoichiometric ratio, dissolve them in ethylene glycol, add an appropriate amount of methanol (the volume fraction of methanol is 5-50%) to obtain a mixed solution, wherein the total amount of metal ions in the mixed solution Concentration is 1.0mol / L, after reaction, macroporous composite metal oxide catalyst La 0.9 K 0.1 CoO 3 precursor solution. Take a small amount of the precursor solution in a crucible, directly place the crucible in a muffle furnace and bake at 600°C for 5 hours to obtain La 0.9 K 0.1 CoO 3 Perovskite type composite metal oxide, cooled for standby.

[0063] figure 2 La prepared for this example 0.9 K 0.1 CoO 3 The scanning electron microscope picture, as can be seen from the figure, La 0.9 K 0.1 CoO 3 Has a honeycomb macroporous structure. Figure 7 La prepared for th...

Embodiment 3

[0069] Example 3 Macroporous LaCo 0.9 Fe 0.1 o 3 Perovskite composite oxide catalyst

[0070] Weigh lanthanum nitrate, cobalt nitrate, and iron nitrate according to the stoichiometric ratio, dissolve them in ethylene glycol, add an appropriate amount of methanol (the volume fraction of methanol is 5-50%) to obtain a mixed solution, wherein the total amount of metal ions in the mixed solution The concentration is 2.0 mol / L, and the precursor solution of the macroporous composite metal oxide catalyst is obtained through the reaction. Take a small amount of the precursor solution in a crucible, directly place the crucible in a muffle furnace and bake at 600°C for 5 hours to obtain LaCo 0.9 Fe 0.1 o 3 Perovskite type composite metal oxide, cooled for standby.

[0071] image 3 LaCo prepared for this example 0.9 Fe 0.1 o 3 The scanning electron microscope photo, as can be seen from the figure, LaCo 0.9 Fe 0.1 o 3 Has a macroporous honeycomb structure. Figure 7 LaCo p...

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Abstract

The invention relates to a macroporous composite metal oxide catalyst for purifying the soot of diesel and a preparation method thereof. The invention firstly provides an oxidation catalyst for the combustion of soot particulates discharged by diesel engine road vehicles, and the catalyst is perovskite type, perovskite-like type or spinel type composite metal oxide which takes more than two elements of rare earth metal, transition metal and basic metal as active components and has a macroporous structure, wherein the average aperture of the composite metal oxide is more than 50nm. The catalyst can reduce the temperature that the soot particulates are combusted into CO2 within an exhaust temperature range of tail gas of the diesel engine road vehicles; and the catalyst has the honeycomb macroporous structure, is favorable for the diffusion of the soot particulates in pore canals, improves the utilization rate of active surface area of the catalyst, and greatly reduces the combustion temperature of the soot particulates. The invention also provides a method for preparing the catalyst, which combines organic complexation with in-situ combustion to prepare the catalyst.

Description

technical field [0001] The invention relates to a technology for purifying soot particles emitted by diesel vehicles, in particular to a macroporous composite metal oxide catalyst for purifying diesel soot and a preparation method thereof, belonging to the technical field of environmental protection. Background technique [0002] Diesel engine has high thermal efficiency, good economy and CO 2 Low emissions and other notable features, therefore, the degree of dieselization of motor vehicles continues to increase. However, the soot particulate matter (PM) emission of diesel vehicles is about 30-80 times that of gasoline vehicles, and the particle size of 70% of the soot particulate matter is less than 0.3 μm, and various organic compounds are adsorbed, such as C 1 -C 20 Hydrocarbons (including barium phosphide), phenols, amines, carcinogens benzopyrene and other oxygen-containing compounds. These extremely fine soot particles have different sedimentation rates in the air, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/94
Inventor 赵震张桂臻刘坚陈胜利姜桂元段爱军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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