Doped catalyst support materials having oxygen storage capacity (OSC) and method of making thereof

    公开(公告)号:US10232348B2

    公开(公告)日:2019-03-19

    申请号:US15184247

    申请日:2016-06-16

    Abstract: 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 for oxygen storage, L is a stabilizer (L) for the Al2O3 support; and D is an oxidizing dopant. 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).

    METHOD OF MAKING MESOPOROUS ZIRCONIUM-BASED MIXED OXIDES

    公开(公告)号:US20190112198A1

    公开(公告)日:2019-04-18

    申请号:US16088858

    申请日:2017-03-30

    Abstract: Mesoporous, zirconium-based mixed oxides and a method of making the same comprises: injecting a polyvalent metal-containing solution into an electrolyte solution to form a mother liquor; forming a precipitate; aging the precipitate in the mother liquor to form the mixed oxides; washing the mixed oxides with an aqueous medium; drying and collecting the mixed oxides. The pH of the electrolyte solution exceeds the isoelectric point for zirconium-based mixed oxides. The mixed oxides exhibit a single particle size distribution, improved Ce02 reducibility in the presence of Rhodium, a decrease in surface area after calcination (800-1 100° C.) that is not more than 55%, and a tetragonal/cubic structure after calcination. After calcination at 1 100° C. for 10 hours in air, the mixed oxides exhibit a surface area >25 m2/g, a pore volume >0.20 cm3/g, an average pore size >30 nm, and an average crystallite size between 8-15 nm.

Patent Agency Ranking