DOPED CERIA-ZIRCONIA-ALUMINA CATALYST SUPPORT MATERIALS WITH OXYGEN STORAGE CAPACITY (OSC) AND METHO

文件类型：PDF文档
文件大小：456K
A catalyst support material (D-CZMLA) with oxygen storage capacity corresponds to the formula vD : x(Ce1-wZrwO2) : yM : zL : (1-v-x-y-z)Al2O3, wherein w is a molar ratio between 0.1-0.8 and v, x, y, and z are weight ratios, such that v is between 0.005- 0.15, x is between 0.05-0.80, and y and z are between 0.001-0.10. M is an interactive promoter such as a rare earth oxide for oxygen storage, L is a stabilizer (L) for the Al2O3 support such as a rare earth oxide; and D is an oxidizing dopant such as a transition metal oxide or alkaline earth metal oxide. The catalyst support material can be incorporated into a wash coat that combines platinum group metals (PGM), an adhesive, and a mixture of (α)RE-Ce-ZrO2+(β)CZMLA+(1-α-β)RE-Al2O3, wherein RE-Ce-ZrO2 is a rare earth element stabilized ceria zirconia having a weight ratio (α) between 0-0.7; CZMLA is the doped catalyst support material having a weight ratio (β) between 0.2-1, such that (α+β) ≤ 1; and RE-Al2O3 is rare earth element stabilized alumina having a weight ratio equal to (1-α-β). The catalyst support material can be used in automotive exhaust gas treatment.