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Macroporous-mesoporous cerium-zirconium solid solution silver-loaded catalyst and preparation method and application thereof

A cerium-zirconium solid solution and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high price of noble metal components, and achieve effective Effects of contact, improvement of catalytic activity, and reduction of diffusion resistance

Inactive Publication Date: 2014-01-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These precious metal components are expensive

Method used

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  • Macroporous-mesoporous cerium-zirconium solid solution silver-loaded catalyst and preparation method and application thereof
  • Macroporous-mesoporous cerium-zirconium solid solution silver-loaded catalyst and preparation method and application thereof
  • Macroporous-mesoporous cerium-zirconium solid solution silver-loaded catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The evaluation method of embodiment 1 catalyst activity

[0082] The catalytic combustion activity of catalysts for the removal of carbon black particles in diesel engine exhaust was evaluated using an atmospheric fixed-bed microreactor device. The reactor is a quartz tube with an inner diameter of 6mm, and the automatic temperature controller controls the programmed temperature rise reaction, and the temperature rise rate is 2°C / min. The experiment selects the carbon black particles in the simulated diesel engine exhaust produced by Degussa Company. Weigh 100 mg of catalyst and carbon black particles (mass ratio 10:1) and mix well with a medicine spoon. After drying, fill it in the constant temperature section of the reaction tube. The contact between the two is between loose contact and contact. The reaction gas composition is: 0.2%NO, 5%O 2 (volume ratio), the rest is He, and the total gas flow rate is 50ml / min. The reaction tail gas was analyzed on the SP-3420 ga...

Embodiment 2

[0083] The preparation method of embodiment 2 colloidal crystal template

[0084] In this example, the colloidal crystal template was prepared according to the following method:

[0085] (1) Preparation of monodisperse PMMA microspheres by soap-free emulsion polymerization

[0086] Add 50ml of acetone and 150ml of deionized water to a tank equipped with a stirrer, reflux condenser, thermometer and N 2 In a 1000ml four-neck flask with a trachea, under the protection of N2 gas, after heating to 80°C in a water bath, add 70ml of MMA, stir at an appropriate speed for 20min, and then add 0.09g of initiator K 2 S 2 o 8 and 0.1538g AIBN (dissolved in 50mL water in advance and heated to 80°C in a water bath). The reaction was continued for 2 h under continuous stirring to obtain a milky white suspension.

[0087] (2) Preparation of colloidal crystal templates by centrifugal deposition method

[0088] The PMMA microspheres were placed in a centrifuge tube, centrifuged at a speed ...

Embodiment 3

[0089] Example 3 Macroporous-mesoporous 3%Ag-Ce 1-x Zr x o 2 oxide catalyst

[0090] Weigh Ce(NO 3 ) 3 ·6H 2 O and ZrClO 8H 2 O and citric acid, dissolved in 10ml of pure ethanol, preferably cerium nitrate: zirconium oxychloride: citric acid: ethanol molar ratio is 1:1:2:2, magnetically stirred for 2h to obtain a homogeneous transparent solution, which is the precursor of the catalyst body solution. At the same time, 0.5g of Brij-56 was dissolved in this solution, and magnetically stirred for 2h. The solution was used to impregnate 3 g of the dried PMMA colloidal crystal template for 10 h. After the impregnation was complete, the excess precursor solution was removed by suction filtration, and then the template was placed in a vacuum drying oven to dry overnight. Finally, it was heated up to 310°C in the air atmosphere for calcination, and kept at 310°C and 500°C for 3h and 5h, respectively, to obtain 3DOM Ce 0.8 Zr 0.2 o 2 oxide catalyst. The air flow rate is 80ml...

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Abstract

The invention relates to a macroporous-mesoporous cerium-zirconium solid solution silver-loaded catalyst and a preparation method and application thereof. The catalyst carrier is a cerium-zirconium solid solution, the chemical composition is Ce0.8Zr0.2O2, active components are elementary-substance silver nanoparticles, and the weight of the active components is 0.01-5% of the weight of the Ce0.8Zr0.2O2 carrier; perferably, the elementary-substance silver nanoparticles are formed by roasting silver nitrate. The macroporous-mesoporous cerium-zirconium solid solution silver-loaded catalyst provided by the invention has very high activity when applied to the catalytic combustion of the soot particles discharged by a diesel vehicle, and the catalyst cost is greatly reduced; moreover, the catalyst preparation method provided by the invention is simple and easy to implement and suitable for large-scale industrial production. The implementation of the invention is of very important fundamental research significance and practical environmental protection significance in control on the tail gas of the diesel vehicle.

Description

technical field [0001] The invention relates to the field of vehicle exhaust gas treatment, in particular to a macroporous-mesoporous cerium zirconium solid solution silver-carrying catalyst and its preparation and application. Background technique [0002] Diesel engines have remarkable characteristics such as high thermal efficiency and good economy, so the degree of dieselization of motor vehicles is constantly improving. However, the emission of soot particulate matter (PM) from diesel vehicles is 30 to 80 times that of gasoline vehicles, of which 70% of soot particles have a particle size of less than 0.3 μm, and are adsorbed with various organic compounds, which can penetrate deep into the human body after being inhaled. The alveoli are not easy to be excreted from the body, and the particulate matter is the carrier of the strong carcinogens benzopyrene and nitro-fused-ring aromatic hydrocarbons, which is very harmful to the human body. Therefore, reducing the emissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66F01N3/023F01N3/035
Inventor 刘坚赵震谭小玉韦岳长徐春明段爱军姜桂元
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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