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Catalyst for combustion of carbon smoke particles, preparation method and application thereof

A technology for soot particles and catalysts, which is applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of expensive exhaust gas purification devices for motor vehicles and the distribution of precious metal particles. Problems such as unevenness and influence on the evaluation of catalytic activity

Inactive Publication Date: 2015-08-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the first problem is that the preparation process easily destroys the existing three-dimensional ordered macroporous oxide structure; the second problem is that the noble metal particles are not easy to be evenly loaded on the inner surface of the macroporous carrier, which makes the distribution of the noble metal particles inside and outside the bulk catalyst uneven. average, which affects the evaluation of catalytic activity; problem three, during the use of the catalyst, under high temperature conditions, the active components of the noble metal are easy to agglomerate, resulting in a decrease in the activity of the catalyst and a decrease in the stability of the catalyst; The price of motor vehicle exhaust purification device is expensive

Method used

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  • Catalyst for combustion of carbon smoke particles, preparation method and application thereof
  • Catalyst for combustion of carbon smoke particles, preparation method and application thereof
  • Catalyst for combustion of carbon smoke particles, preparation method and application thereof

Examples

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Embodiment 1

[0100] This embodiment provides a method for preparing a catalyst for soot particulate matter combustion, which comprises the following steps:

[0101] 1. Carrier three-dimensional ordered macroporous oxide (such as ZrO 2 、Al 2 o 3 , SiO 2 ) preparation method, which comprises the following steps 1), step 2), step 3):

[0102] 1) Prepare monodisperse polymer microspheres by soap-free emulsion polymerization:

[0103]Add 50mL of acetone and 150mL of double-distilled water into a 1000mL four-neck flask, preheat it to 70°C with a 70°C water bath, add 70mL monomeric methyl methacrylate or styrene into the four-neck flask preheated to 70°C in the flask;

[0104] While preheating the reactants, weigh 0.090g of potassium persulfate and 0.1538g of azobisisobutyronitrile (AIBN), dissolve them in 150mL of water to obtain an aqueous initiator solution, and heat it to 70°C in a water bath; When the methyl acrylate solution or styrene solution is preheated to 70°C, add the above-ment...

Embodiment 2

[0119] This embodiment provides a method for preparing a catalyst for soot particulate matter combustion, which comprises the following steps:

[0120] 1. Carrier 3DOM ZrO 2 The preparation method is the same as in Example 1, and will not be repeated here;

[0121] 2. Preparation of catalyst for combustion of soot particles.

[0122] In this embodiment, the carrier is a three-dimensional ordered macroporous structure ZrO 2 , the active component is Pt single-atom dispersed CeO 2-δ The preparation of the catalyst of nano-film is example, set forth the preparation method of the soot particle combustion catalyst of the present invention, and obtain three-dimensional ordered macroporous ZrO 2 Single-atom dispersed CeO loaded with Pt 2-δ Nano film catalyst, its preparation method comprises the following steps:

[0123] H with a concentration of 0.005mmol / L 2 PtCl 6 Aqueous solution, cerous nitrate hexahydrate (with H 2 PtCl 6 The molar ratio is 200:1) aqueous solution and ...

Embodiment 3

[0129] This example provides a Pt supported on 3DOM ZrO in the form of monoatomic dispersion 2 The preparation method of the catalyst on carrier, it comprises the following steps:

[0130] The concentration was 0.005mmol H 2 PtCl 6 aqueous solution with 1.72g of 3DOM ZrO 2 Carrier mixed to get Pt and 3DOM ZrO 2 Aqueous solution of carrier;

[0131] Make prepared Pt and 3DOM ZrO 2 The aqueous solution of the carrier enters the gas membrane assisted precipitation reaction device under the action of the peristaltic pump, and at the same time starts the hydrogen input device, and the hydrogen diffuses out of the membrane tube through the micropores with a diameter of 40nm on the two ceramic membrane tubes, generating a large number of hydrogen bubbles , to promote the mixing of the carrier and the solution, the hydrogen flow rate is 50mL / min;

[0132] Then it was dried at 100°C for 12 hours and calcined at 500°C for 4 hours to obtain Pt supported on 3DOM ZrO in the form of m...

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Abstract

The invention provides a catalyst for combustion of carbon smoke particles, a preparation method and an application thereof. The catalyst is prepared with a three-dimensional ordered macroporous-structured oxide as a carrier and an oxide nano thin film as an active component, wherein the oxide nano thin film is supported on the outer surface and the surfaces of internal pores of the three-dimensional ordered macroporous-structured oxide carrier and contains noble metals. The oxide nano thin film is formed by combination of one or more from rare earth oxides and / or transition metal oxides. On the basis of the total weight of the three-dimensional ordered macroporous-structured oxide as 100%, the support capacity of the noble metals is 0.001-0.5% and the molar ratio of the rare earth oxides and / or the transition metal oxides to the noble metals is 20:1-1000:1. The invention also provides the preparation method and the application of the catalyst. The catalyst is better in catalytic activity and especially can satisfy a cold-start requirement of motor vehicles in low-temperature catalytic activity.

Description

technical field [0001] The invention relates to a catalyst for combustion of soot particulate matter, a preparation method and application thereof, and belongs to the technical field of catalytic oxidation. Background technique [0002] Improving the activity of the catalyst used to purify particulate matter (PM) emitted by motor vehicle exhaust, reducing the combustion temperature of particulate matter, so that the particulate matter trap can work continuously for a long time is the most direct way to reduce particulate matter emitted by motor vehicles. Since the elimination reaction of particulate matter is a gas-solid (particle)-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 catalyst and The degree of exposure to PM is closely related. For catalysts with the same active component, the higher the contact abili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/42B01J23/10B01J23/63F01N3/035
Inventor 韦岳长赵震焦金庆张新栋李亚钊刘坚段爱军姜桂元
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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