Ce-Zr composite alumina oxide material and preparation method thereof

Abstract

The invention discloses a Ce-Zr composite alumina oxide material and a preparation method thereof, relates to a rare earth material for automobile exhaust purification catalysts, and belongs to the technical field of rare earth materials. The Ce-Zr composite alumina material is prepared from the following ingredients in molar ratio (based on total composite oxide amount): 5-25mol% of cerium oxide, 5-25mol% of zirconium oxide and 70 mol% of alumina. A coprecipitation method is adopted for preparation, the Ce-Zr composite alumina material is calcinated at 880 DEGC, the specific surface area can be more than 210m<2> / g, and the pore volume can be more than 0.5cc / g; the Ce-Zr composite alumina material is calcinated at 1000 DEG C and aged, the specific surface area is still larger than 110m<2> / g, and the pore volume can be more than 0.3cc / g. The Ce-Zr composite alumina material has the relatively large specific surface area, the good heat stability and texture stability and the good catalytic activity and is widely applied to the automobile exhaust purification catalysts, combustion catalysts and other catalysts.

Description

technical field [0001] The invention belongs to the technical field of rare earth materials, and relates to a rare earth material used as a catalyst for purifying automobile tail gas, in particular to a Ce-Zr composite alumina material and a preparation method thereof. Background technique [0002] As we all know, automobile exhaust is the main source of air pollution. Pollutants mainly include hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx), in addition, there are harmful substances such as sulfur dioxide, which not only seriously pollute the atmosphere, deteriorate environment and directly threaten people's health. All countries in the world have invested a lot of manpower, material resources, and financial resources to control vehicle exhaust pollution. Most countries have established vehicle exhaust emission standards and are becoming increasingly strict, requiring all motor vehicle exhaust emissions to meet the required standards. [0003] In high-temper...

AI Technical Summary

Problems solved by technology

[0003] In high-temperature and harsh environments such as catalytic purification of automobile exhaust and catalytic combustion, the specific surface positive velocity of the catalyst carrier alumina is reduced due to phase change and sintering, which leads to a decrease in catalyst activity.

Images