Study On Preparation And Properties Of The Oxygen Storage Material CeO₂-ZrO₂-La₂O₃-Pr₆O₁₁

With the rapid development of automobile industry in China, exhaust pollution is worsening, performance and quality requirements for autocatalysts are also increasing. The standard requirements of automobile exhaust emissions are more and more strict, rare earth oxygen storage materials are developed to meet the needs of the market, it is an important component of the catalyst, the main factors catalytic activity, durability, and the amount of precious metals. Preparation and Application of Rare Earth to carry oxygen storage material, not only to implement the national resource-saving and environment-friendly society development and automobile emissions need to adapt to the new standards, at the same time to promote China’s rare earth resources make full use of multi direction and multi field to promote the development of rare earth materials, and to improve the overall level of China’s automobile exhaust catalyst.This article was prepared CeO₂-ZrO₂-La2O3-Pr6O11 composite oxide oxygen storage material, study the effects of dispersants and surfactant concentration of oxygen storage material properties; by praseodymium-doped lanthanum different proportions of CeO₂-ZrO₂-La2O3-Pr6O11 Preparation of complex oxide oxygen storage material investigated doping amount of lanthanum, praseodymium and preparation methods affect its performance; and through the new autocatalyst carrier prepared and processed with oxygen storage material prepared autocatalysts, investigated praseodymium lanthanum catalyst light-off temperature and the complete conversion temperature. Using Rigaku D / max-2200 PC X-ray diffractometer, ST-2000 type tester pore surface area, Malvern Mastersizer 2000 particle size analyzer, EDAX GENESIS spectrometer, JSM6500 F type of high-resolution scanning electron microscope（HRSEM）, Hitachi H- 700 TEM analysis and other testing means testing, and then the following conclusions.（1） In ceria zirconium lanthanum praseodymium oxide composite oxygen storage materials add different mass fractions of dispersion agent and adding different concentrations of surfactant study found that: when dispersing agent mass fraction of 0.04%, samples of fresh than surface area and after aging of the specific surface area is the maximum; when the surface active agent concentration is 4%, the specimen in fresh than surface area and after aging than the largest surface area.（2）In fresh cerium zirconium solid solution add different proportions of lanthanum praseodymium oxides oxygen storage material, cerium zirconium lanthanum praseodymium oxygen storage materials in unaged and aged after the phase stability and anti-aging ability.（3） Test preparation of new type of automobile exhaust purification catalyst carrier, found to have the small thermal expansion coefficient, good thermal expansion, high temperature resistant, large aperture, Tabitha table area and many other advantages.（4） The oxygen storage materials preparation of automobile exhaust purification catalyst catalytic activity tests showed that, put a small amount of PR, the La added to ceria zirconia oxygen storage material, the material of automobile exhaust harmful gas composition of combustion and transformation has a good role in promoting.At present, rare earth oxygen storage material as the exhaust catalyst, a substantial increase in the catalyst of oxygen storage capacity, thermal stability and oxidation reduction properties, catalytic materials with great application value and development of high performance rare earth oxygen storage material, it is urgent to study on.CeO₂-ZrO₂-La2O3-Pr6O11 composite oxide oxygen storage materials prepared by the system, the material with specific surface area, large oxygen storage and high temperature aging characteristics of strong ability, application in automobile exhaust purification catalyst can make the catalyst combustion temperature and complete conversion temperature decreased, the catalytic conversion of CO, NOx and C3H6 activity strengthen. The material has a good promotion effect on the ignition and transformation of harmful gas components of automobile exhaust, and has good application prospects.