Abstract: Disclosed herein are compositions having enhanced oxygen storage capacity (OSC). The OSC enhanced compositions contain cerium, zirconium, lanthanum, and neodymium, and a dopant element selected from the group consisting of Ti, Mn, Fe, Co, Cu, Zn, Ga, Ge, Ta, W, Mo, Nb, In, Sn, Ba, and mixtures thereof. In certain embodiments, these compositions contain two dopants. In certain embodiments of these compositions, the compositions comprising cerium, zirconium, lanthanum, and neodymium and one or more dopant elements have an OSC after aging at 1000° C. for 10 hours which is improved by 1 to 50%, compared to an undoped composition comprising cerium, zirconium, lanthanum, and neodymium. Aging can be conducted in an air environment. Further disclosed are processes of producing these compositions having enhanced oxygen storage capacity (OSC). The compositions can be used as a catalyst.

Abstract: Disclosed herein are catalyst compositions having improved mercury intrusion volume and surface areas and processes for making these compositions. The enhanced compositions disclosed herein contain zirconium, cerium, optionally yttrium, and optionally one or more rare earths other than cerium and yttrium. Further disclosed are processes of producing these compositions involving supercritical drying after addition of mesitylene. The compositions can be used as a catalyst and/or as part of a catalyst system in an automobile exhaust system.