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Catalyst for macro-porous oxide supported core-shell structure nanoparticles and preparation method of catalyst

A technology of core-shell structure and nanoparticles, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Noble metal particles are not easy to uniformly load and other problems, to achieve the effect of improving catalytic activity

Inactive Publication Date: 2013-08-14
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, problem one, the preparation process can easily destroy the structure of the existing three-dimensional ordered macroporous oxide
The second problem is that noble metal particles are not easy to be evenly loaded on the inner surface of the macroporous carrier, which makes the distribution of noble metal particles inside and outside the bulk catalyst uneven, which affects the evaluation of catalytic activity
The third problem is that 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

Method used

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  • Catalyst for macro-porous oxide supported core-shell structure nanoparticles and preparation method of catalyst
  • Catalyst for macro-porous oxide supported core-shell structure nanoparticles and preparation method of catalyst
  • Catalyst for macro-porous oxide supported core-shell structure nanoparticles and preparation method of catalyst

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Experimental program
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preparation example Construction

[0075] Preparation method of three-dimensional ordered macroporous simple oxide support:

[0076] 1) Monodisperse polymer microspheres were prepared by soap-free emulsion polymerization

[0077] Add 50mL of acetone and 150mL of double distilled water to a 1000mL four-neck flask, preheat to 70°C with a 70°C water bath, and add 70mL of monomer methyl methacrylate (or styrene) to the preheated four-neck flask. while preheating the reactants, weigh 0.090g potassium persulfate and 0.1538g azobisisobutyronitrile (AIBN), dissolve in 150mL water to obtain an aqueous initiator solution, and heat the water bath to 70°C; the monomer to be reacted When preheated to 70°C, add the initiator aqueous solution at 70°C, and continue to stir for 2-10 hours to obtain a monodisperse polymethyl methacrylate (or polystyrene) microsphere emulsion with a solid content of 5-10%;

[0078] 2) Preparation of colloidal crystal templates by centrifugal deposition method or evaporative deposition method

...

Embodiment 13D

[0084] Example 13DOM AuCeO 2-δ / ZrO 2 catalyst

[0085] This embodiment provides a 3DOM AuCeO 2-δ / ZrO 2 The preparation method of catalyst, it comprises the following concrete steps:

[0086] The precursor salt HAuCl with a concentration of 12.12 mmol / L was 4 aqueous solution, cerium nitrate hexahydrate (with HAuCl 4 The molar ratio of 10:1) with 0.5g of 3DOM ZrO 2 Mixing (the loading amount of Au is controlled to be 0.5-8wt%), and at the same time, a stabilizer PVP with a concentration of 1.2mol / L (the addition amount is the same as that of HAuCl) is added. 4 The aqueous solution is the same) to obtain the aqueous solution of the precursor salt of Au and cerium nitrate, and the ratio of different raw materials is shown in Table 1.

[0087] The aqueous solution of the prepared Au precursor salt enters the membrane reactor under the action of the peristaltic pump, and the hydrogen input device is activated at the same time. Hydrogen bubbles promote the mixing of the ca...

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PUM

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Abstract

The invention relates to a catalyst for macro-porous oxide supported core-shell structure nanoparticles and a preparation method of the catalyst. The catalyst for the macro-porous oxide supported core-shell structure nanoparticles is obtained by using a simple oxide with a three-dimensional macro-porous structure as a supporter to support the core-shell structure nanoparticles; the core of the core-shell structure nanoparticles is noble metal; the shell material of the core-shell structure nanoparticles is one or combination of more selected from rare earth elements and transitional metal elements; the simple oxide is the catalytically inactive oxide; the average pore size of the macro-pore of the supporter is 50nm to 1mu m. The invention also provides a preparation method of the catalyst. Compared with a corresponding general catalyst, a nanoparticle catalyst and a three-dimensional ordered macro-porous oxide catalyst, the oxidation catalyst, prepared by supporting noble metal (core)-rare earth element or transitional metal element (shell) active component by the simple oxide with a three-dimensional ordered macro-porous structure, has higher catalytic activity.

Description

technical field [0001] The invention relates to a catalyst for macroporous oxide-carrying core-shell structure nanoparticles and a preparation method thereof, and belongs to the technical field of oxidation catalysts for combustion of soot particles emitted from diesel vehicles. 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 emission of soot particulate matter from 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 catalyst and PM is closely r...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J37/16B01J37/03B01J35/10B01D53/94
Inventor 韦岳长赵震于学华靳保芳刘坚段爱军姜桂元
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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