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Three-dimensional ordered macroporous oxide catalyst for diesel soot purification and preparation method thereof

A technology for oxidizing catalysts and oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of obtaining composite metal oxides, Consistent metal molar ratio of composite metal oxides and other issues to achieve the effects of easy control of the reaction process, simple and easy preparation process, and reduced diffusion resistance

Inactive Publication Date: 2010-06-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, due to the different coordination abilities of citric acid to different metal ions, citric acid is used as a complexing agent to prepare perovskite-type, perovskite-like, spinel-type, scheelite-type, and Ce-based solid solution When a three-dimensional ordered macroporous composite metal oxide is used, the composition of the obtained composite metal oxide is difficult to keep consistent with the metal molar ratio in the precursor solution, and it is difficult to obtain a composite metal oxide that meets the requirements of the stoichiometric ratio

Method used

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  • Three-dimensional ordered macroporous oxide catalyst for diesel soot purification and preparation method thereof
  • Three-dimensional ordered macroporous oxide catalyst for diesel soot purification and preparation method thereof
  • Three-dimensional ordered macroporous oxide catalyst for diesel soot purification and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 13D

[0064] Example 13 DOM CeO 2 simple metal oxides

[0065] Take a small amount of polymethyl methacrylate microsphere emulsion with a particle size of 446nm, centrifuge at a speed of 3000rpm for 10h to obtain a PMMA colloidal crystal template, and dry naturally;

[0066] Weigh a certain amount of cerium nitrate, dissolve it in ethylene glycol, transfer the resulting solution to a volumetric flask, and constant volume with methanol (methanol volume fraction is 5-50%), the concentration of metal ions in the prepared solution is 2.0mol / L, to get 3DOM CeO 2 The precursor solution;

[0067] Add 3DOM CeO dropwise to the dried PMMA colloidal crystal template 2 Precursor solution until the solution is immersed in the PMMA template. After the impregnation is complete, remove the excess solution by suction filtration to obtain the precursor / PMMA composite, dry it naturally, and then place it in a tube furnace at a heating rate of ≤2°C / min Raise the temperature to 500°C and roast (kee...

Embodiment 23D

[0077] Example 23 DOM LaFeO 3 composite metal oxide

[0078] Take a small amount of polystyrene microsphere emulsion with a particle size of 367nm, centrifuge at a speed of 3000rpm for 20h to obtain a PS colloidal crystal template, and dry naturally;

[0079] Weigh lanthanum nitrate and ferric nitrate according to the stoichiometric ratio (molar ratio 1:1), add ethylene glycol therein, magnetically stir for 2 h, transfer the resulting solution to a volumetric flask, and dilute to volume with methanol (the volume fraction of methanol is 30%), the concentration of metal ions in the prepared solution is 1.5mol / L, and 3DOM LaFeO 3 The precursor solution, this solution is 3DOM LaFeO 3 The precursor solution of composite metal oxide catalyst;

[0080] 3DOM LaFeO 3 The precursor solution was added dropwise to the dry PS colloidal crystal template until the solution submerged the PS template. After the impregnation was complete, the excess solution was removed by suction filtratio...

Embodiment 33

[0091] Example 33 DOMLa 0.9 K 0.1 FeO 3 composite metal oxide

[0092] Take a small amount of polymethyl methacrylate microsphere emulsion with a particle size of 487nm, centrifuge at a speed of 2000rpm for 15h, discard the supernatant to obtain a PMMA colloidal crystal template, and dry naturally;

[0093] Weigh lanthanum nitrate, potassium nitrate and ferric nitrate according to the stoichiometric ratio (9:1:10 in molar ratio), add ethylene glycol therein, stir magnetically for 2 hours, transfer the resulting solution to a volumetric flask, and dilute to volume with methanol (methanol volume fraction is 40%), metal ion concentration is 2.0mol / L in the prepared solution, obtains 3DOMLa 0.9 K 0.1 FeO 3 The precursor solution, this solution is 3DOM La 0.9 K 0.1 FeO 3 The precursor solution of composite metal oxide catalyst;

[0094] Add 3DOM La dropwise to the dried PS colloidal crystal mold 0.9 K 0.1 FeO 3 Precursor solution until the solution is immersed in the PM...

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Abstract

The invention relates to a three-dimensional ordered macroporous (3DOM) complex metal oxide catalyst for diesel soot purification and a preparation method thereof. The invention firstly provides an oxidization catalyst for combustion of soot particles discharged by a diesel vehicle, which is a simple metal oxide or complex metal oxide which selects more than one from rare-earth metal, transition metal and alkalinous metal as active components and has the 3DOM structure, wherein the average pore diameter is 50nm-1mum. The utilization of the catalyst with the 3DOM structure is beneficial to the diffusion of soot particles, improves the utilization rate of the active surface area of the catalyst, and greatly decreases the combustion temperature of the soot particles. The invention also provides a preparation method of the catalyst, comprising the step of dipping a colloidal crystal template through an organic complex agent solution that contains the active component of the catalyst, and then roasting to obtain the catalyst.

Description

technical field [0001] The invention relates to a technology for purifying soot particles emitted by diesel vehicles, in particular to a three-dimensional ordered macroporous oxide catalyst for purifying diesel soot and a preparation method thereof, belonging to the technical field of environmental protection. Background technique [0002] Improving the activity of the catalyst for purifying soot particulate matter (PM) from diesel vehicle exhaust, reducing the combustion temperature of soot particulate matter, so that the soot particulate matter trap can work continuously for a long time is the most direct way to reduce the soot particulate matter emitted by diesel engines method. Since the elimination reaction of soot is a gas-solid (soot)-solid (catalyst) three-phase complex deep oxidation reaction process, the improvement of catalyst activity is not only closely related to the redox performance of the oxide catalyst itself, but also to the solid The contact degree of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/10B01J35/10B01D53/94
Inventor 赵震张桂臻刘坚陈胜利段爱军姜桂元
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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