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A kind of cerium-zirconium composite oxide-supported platinum catalyst and its preparation method and application

A technology of composite oxides and catalysts, 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 catalyst stability reduction, catalyst activity decline, noble metal particles, etc. Uneven size distribution and other problems, to achieve the effect of simple and easy preparation method, high resistance to high temperature sintering performance, and easy control of the preparation process

Inactive Publication Date: 2019-09-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have their own characteristics, but there are also common shortcomings that the noble metal particles are not easy to disperse evenly, and the particle size of the loaded particles is difficult to maintain uniformity.
For example, noble metal particles are not easy to be evenly loaded on the inner surface of the macroporous carrier, which makes the size distribution of the noble metal particles of the bulk catalyst uneven, which affects the evaluation of catalytic activity; during the use of the catalyst, the active components of the noble metal are easy to agglomerate under high temperature conditions The activity of the catalyst is reduced, and the stability of the catalyst is reduced; the amount of precious metals is relatively high, resulting in the high price of the current motor vehicle exhaust purification device

Method used

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  • A kind of cerium-zirconium composite oxide-supported platinum catalyst and its preparation method and application
  • A kind of cerium-zirconium composite oxide-supported platinum catalyst and its preparation method and application
  • A kind of cerium-zirconium composite oxide-supported platinum catalyst and its preparation method and application

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Experimental program
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Embodiment 1

[0050] This embodiment provides a method for preparing a catalyst of platinum nanoparticles supported on cerium-zirconium composite oxide, the method comprising the following steps:

[0051] 1. The cerium-zirconium composite oxide of nanorod structure is prepared, comprising the following steps:

[0052] a, 1.49g of cerous nitrate and 0.16g of zirconium nitrate were dissolved in 5mL of water to obtain a cerium-zirconium salt solution;

[0053] B, the sodium hydroxide of 14.4g is dissolved with 55mL water, obtains sodium hydroxide solution;

[0054] c. Add the sodium hydroxide solution obtained in step b dropwise to the cerium-zirconium salt solution obtained in step a in the stirring state, and continue stirring for 1 h after the dropwise addition is completed;

[0055] d. Transfer the mixed solution obtained in step c to a 100mL hydrothermal crystallizer for crystallization at a constant temperature of 100°C for 24h, and then naturally cool down to room temperature;

[0056...

Embodiment 2

[0066] This embodiment provides the Rod-Ce that embodiment 1 prepares 0.9 Zr 0.1 o 2 and Pt / Rod-Ce 0.9 Zr 0.1 o 2 The application in the combustion of particulate matter emitted by motor vehicles is to investigate the catalytic activity of the above-mentioned catalyst.

[0067] Catalyst activity evaluation method:

[0068] The activities of the above two catalysts were evaluated using a fixed-bed microreactor-gas chromatography detection system.

[0069] Specific parameters in the application process: the dosage of the above catalyst samples is 100 mg, and the mass ratio of catalyst to adsorption carbon is 10:1.

[0070] Specific steps: put the weighed catalyst and adsorbed carbon in a small beaker, stir evenly with a medicine spoon, make the catalyst loosely contact with the particles, put the catalyst and adsorbed carbon into a 6mm quartz reaction tube, and control the gas The flow rate is 50mL / min, the volume content of NO in the gas is 2000ppm, O 2 The volume conte...

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Abstract

The invention relates to a cerium-zirconium compound oxide loading platinum catalyst as well as a preparation method and application thereof. According to the catalyst, a cerium-zirconium compound oxide of a nanorod structure is used as a carrier; platinum is used as an active loaded component; the platinum is loaded on the surface of the cerium-zirconium compound oxide in the form of a single atom or a nano particle. The catalyst can be used for improving the catalytic oxidation activity, particularly the low-temperature catalytic activity, on a particulate matter discharged from a motor vehicle to meet the cold-start requirement of the motor vehicle. The method is simple, easy and feasible; the use level of noble metal is few; therefore, the catalyst can be applied to the combustion of a charcoal-smoke particulate matter, and particularly applied to the combustion of the charcoal-smoke particulate matter discharged from the motor vehicle.

Description

technical field [0001] The invention relates to a platinum-supported catalyst of cerium-zirconium composite oxide and its preparation method and application. The catalyst is used for purifying soot particles emitted by motor vehicles and belongs to the technical field of catalytic oxidation. Background technique [0002] Compared with gasoline engines, diesel engines have high fuel efficiency and low CO 2 The characteristics of emission and high durability play an important role in modern society and are widely used in motor vehicles, ships and large machinery. However, soot particulate matter (PM), the main emission of diesel engines, is causing serious pollution to the atmospheric environment, seriously threatening the ecological environment and human health. Pollutants emitted by motor vehicles are one of the main sources of urban atmospheric PM2.5, especially in large cities, particulate matter, VOC, polycyclic aromatic hydrocarbons, SO 2 , NOx and metal ions are the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63F01N3/28
CPCB01J23/002B01J23/63F01N3/2807Y02A50/20
Inventor 韦岳长赵震熊靖赵一龙刘坚
Owner CHINA UNIV OF PETROLEUM (BEIJING)